5138 lines
117 KiB
C
5138 lines
117 KiB
C
/*-
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* SPDX-License-Identifier: BSD-2-Clause-FreeBSD
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*
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* Copyright (c) 2015, 2016 The FreeBSD Foundation
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* Copyright (c) 2004, David Xu <davidxu@freebsd.org>
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* Copyright (c) 2002, Jeffrey Roberson <jeff@freebsd.org>
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* All rights reserved.
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*
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* Portions of this software were developed by Konstantin Belousov
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* under sponsorship from the FreeBSD Foundation.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice unmodified, this list of conditions, and the following
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* disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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*
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* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
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* IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
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* OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
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* IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
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* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
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* NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
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* THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*/
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#include <sys/cdefs.h>
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__FBSDID("$FreeBSD$");
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#include "opt_umtx_profiling.h"
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#include <sys/param.h>
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#include <sys/kernel.h>
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#include <sys/fcntl.h>
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#include <sys/file.h>
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#include <sys/filedesc.h>
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#include <sys/limits.h>
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#include <sys/lock.h>
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#include <sys/malloc.h>
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#include <sys/mman.h>
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#include <sys/mutex.h>
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#include <sys/priv.h>
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#include <sys/proc.h>
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#include <sys/resource.h>
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#include <sys/resourcevar.h>
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#include <sys/rwlock.h>
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#include <sys/sbuf.h>
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#include <sys/sched.h>
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#include <sys/smp.h>
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#include <sys/sysctl.h>
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#include <sys/systm.h>
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#include <sys/sysproto.h>
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#include <sys/syscallsubr.h>
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#include <sys/taskqueue.h>
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#include <sys/time.h>
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#include <sys/eventhandler.h>
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#include <sys/umtx.h>
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#include <sys/umtxvar.h>
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#include <security/mac/mac_framework.h>
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#include <vm/vm.h>
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#include <vm/vm_param.h>
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#include <vm/pmap.h>
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#include <vm/vm_map.h>
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#include <vm/vm_object.h>
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#include <machine/atomic.h>
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#include <machine/cpu.h>
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#include <compat/freebsd32/freebsd32.h>
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#ifdef COMPAT_FREEBSD32
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#include <compat/freebsd32/freebsd32_proto.h>
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#endif
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#define _UMUTEX_TRY 1
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#define _UMUTEX_WAIT 2
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#ifdef UMTX_PROFILING
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#define UPROF_PERC_BIGGER(w, f, sw, sf) \
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(((w) > (sw)) || ((w) == (sw) && (f) > (sf)))
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#endif
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#define UMTXQ_LOCKED_ASSERT(uc) mtx_assert(&(uc)->uc_lock, MA_OWNED)
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#ifdef INVARIANTS
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#define UMTXQ_ASSERT_LOCKED_BUSY(key) do { \
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struct umtxq_chain *uc; \
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\
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uc = umtxq_getchain(key); \
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mtx_assert(&uc->uc_lock, MA_OWNED); \
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KASSERT(uc->uc_busy != 0, ("umtx chain is not busy")); \
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} while (0)
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#else
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#define UMTXQ_ASSERT_LOCKED_BUSY(key) do {} while (0)
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#endif
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/*
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* Don't propagate time-sharing priority, there is a security reason,
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* a user can simply introduce PI-mutex, let thread A lock the mutex,
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* and let another thread B block on the mutex, because B is
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* sleeping, its priority will be boosted, this causes A's priority to
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* be boosted via priority propagating too and will never be lowered even
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* if it is using 100%CPU, this is unfair to other processes.
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*/
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#define UPRI(td) (((td)->td_user_pri >= PRI_MIN_TIMESHARE &&\
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(td)->td_user_pri <= PRI_MAX_TIMESHARE) ?\
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PRI_MAX_TIMESHARE : (td)->td_user_pri)
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#define GOLDEN_RATIO_PRIME 2654404609U
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#ifndef UMTX_CHAINS
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#define UMTX_CHAINS 512
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#endif
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#define UMTX_SHIFTS (__WORD_BIT - 9)
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#define GET_SHARE(flags) \
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(((flags) & USYNC_PROCESS_SHARED) == 0 ? THREAD_SHARE : PROCESS_SHARE)
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#define BUSY_SPINS 200
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struct umtx_copyops {
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int (*copyin_timeout)(const void *uaddr, struct timespec *tsp);
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int (*copyin_umtx_time)(const void *uaddr, size_t size,
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struct _umtx_time *tp);
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int (*copyin_robust_lists)(const void *uaddr, size_t size,
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struct umtx_robust_lists_params *rbp);
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int (*copyout_timeout)(void *uaddr, size_t size,
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struct timespec *tsp);
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const size_t timespec_sz;
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const size_t umtx_time_sz;
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const bool compat32;
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};
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_Static_assert(sizeof(struct umutex) == sizeof(struct umutex32), "umutex32");
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_Static_assert(__offsetof(struct umutex, m_spare[0]) ==
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__offsetof(struct umutex32, m_spare[0]), "m_spare32");
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int umtx_shm_vnobj_persistent = 0;
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SYSCTL_INT(_kern_ipc, OID_AUTO, umtx_vnode_persistent, CTLFLAG_RWTUN,
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&umtx_shm_vnobj_persistent, 0,
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"False forces destruction of umtx attached to file, on last close");
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static int umtx_max_rb = 1000;
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SYSCTL_INT(_kern_ipc, OID_AUTO, umtx_max_robust, CTLFLAG_RWTUN,
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&umtx_max_rb, 0,
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"Maximum number of robust mutexes allowed for each thread");
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static uma_zone_t umtx_pi_zone;
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static struct umtxq_chain umtxq_chains[2][UMTX_CHAINS];
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static MALLOC_DEFINE(M_UMTX, "umtx", "UMTX queue memory");
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static int umtx_pi_allocated;
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static SYSCTL_NODE(_debug, OID_AUTO, umtx, CTLFLAG_RW | CTLFLAG_MPSAFE, 0,
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"umtx debug");
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SYSCTL_INT(_debug_umtx, OID_AUTO, umtx_pi_allocated, CTLFLAG_RD,
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&umtx_pi_allocated, 0, "Allocated umtx_pi");
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static int umtx_verbose_rb = 1;
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SYSCTL_INT(_debug_umtx, OID_AUTO, robust_faults_verbose, CTLFLAG_RWTUN,
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&umtx_verbose_rb, 0,
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"");
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#ifdef UMTX_PROFILING
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static long max_length;
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SYSCTL_LONG(_debug_umtx, OID_AUTO, max_length, CTLFLAG_RD, &max_length, 0, "max_length");
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static SYSCTL_NODE(_debug_umtx, OID_AUTO, chains, CTLFLAG_RD | CTLFLAG_MPSAFE, 0,
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"umtx chain stats");
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#endif
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static inline void umtx_abs_timeout_init2(struct umtx_abs_timeout *timo,
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const struct _umtx_time *umtxtime);
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static void umtx_shm_init(void);
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static void umtxq_sysinit(void *);
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static void umtxq_hash(struct umtx_key *key);
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static int do_unlock_pp(struct thread *td, struct umutex *m, uint32_t flags,
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bool rb);
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static void umtx_thread_cleanup(struct thread *td);
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SYSINIT(umtx, SI_SUB_EVENTHANDLER+1, SI_ORDER_MIDDLE, umtxq_sysinit, NULL);
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#define umtxq_signal(key, nwake) umtxq_signal_queue((key), (nwake), UMTX_SHARED_QUEUE)
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static struct mtx umtx_lock;
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#ifdef UMTX_PROFILING
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static void
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umtx_init_profiling(void)
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{
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struct sysctl_oid *chain_oid;
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char chain_name[10];
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int i;
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for (i = 0; i < UMTX_CHAINS; ++i) {
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snprintf(chain_name, sizeof(chain_name), "%d", i);
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chain_oid = SYSCTL_ADD_NODE(NULL,
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SYSCTL_STATIC_CHILDREN(_debug_umtx_chains), OID_AUTO,
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chain_name, CTLFLAG_RD | CTLFLAG_MPSAFE, NULL,
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"umtx hash stats");
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SYSCTL_ADD_INT(NULL, SYSCTL_CHILDREN(chain_oid), OID_AUTO,
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"max_length0", CTLFLAG_RD, &umtxq_chains[0][i].max_length, 0, NULL);
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SYSCTL_ADD_INT(NULL, SYSCTL_CHILDREN(chain_oid), OID_AUTO,
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"max_length1", CTLFLAG_RD, &umtxq_chains[1][i].max_length, 0, NULL);
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}
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}
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static int
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sysctl_debug_umtx_chains_peaks(SYSCTL_HANDLER_ARGS)
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{
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char buf[512];
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struct sbuf sb;
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struct umtxq_chain *uc;
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u_int fract, i, j, tot, whole;
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u_int sf0, sf1, sf2, sf3, sf4;
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u_int si0, si1, si2, si3, si4;
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u_int sw0, sw1, sw2, sw3, sw4;
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sbuf_new(&sb, buf, sizeof(buf), SBUF_FIXEDLEN);
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for (i = 0; i < 2; i++) {
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tot = 0;
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for (j = 0; j < UMTX_CHAINS; ++j) {
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uc = &umtxq_chains[i][j];
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mtx_lock(&uc->uc_lock);
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tot += uc->max_length;
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mtx_unlock(&uc->uc_lock);
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}
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if (tot == 0)
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sbuf_printf(&sb, "%u) Empty ", i);
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else {
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sf0 = sf1 = sf2 = sf3 = sf4 = 0;
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si0 = si1 = si2 = si3 = si4 = 0;
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sw0 = sw1 = sw2 = sw3 = sw4 = 0;
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for (j = 0; j < UMTX_CHAINS; j++) {
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uc = &umtxq_chains[i][j];
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mtx_lock(&uc->uc_lock);
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whole = uc->max_length * 100;
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mtx_unlock(&uc->uc_lock);
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fract = (whole % tot) * 100;
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if (UPROF_PERC_BIGGER(whole, fract, sw0, sf0)) {
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sf0 = fract;
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si0 = j;
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sw0 = whole;
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} else if (UPROF_PERC_BIGGER(whole, fract, sw1,
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sf1)) {
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sf1 = fract;
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si1 = j;
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sw1 = whole;
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} else if (UPROF_PERC_BIGGER(whole, fract, sw2,
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sf2)) {
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sf2 = fract;
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si2 = j;
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sw2 = whole;
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} else if (UPROF_PERC_BIGGER(whole, fract, sw3,
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sf3)) {
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sf3 = fract;
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si3 = j;
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sw3 = whole;
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} else if (UPROF_PERC_BIGGER(whole, fract, sw4,
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sf4)) {
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sf4 = fract;
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si4 = j;
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sw4 = whole;
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}
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}
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sbuf_printf(&sb, "queue %u:\n", i);
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sbuf_printf(&sb, "1st: %u.%u%% idx: %u\n", sw0 / tot,
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sf0 / tot, si0);
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sbuf_printf(&sb, "2nd: %u.%u%% idx: %u\n", sw1 / tot,
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sf1 / tot, si1);
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sbuf_printf(&sb, "3rd: %u.%u%% idx: %u\n", sw2 / tot,
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sf2 / tot, si2);
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sbuf_printf(&sb, "4th: %u.%u%% idx: %u\n", sw3 / tot,
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sf3 / tot, si3);
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sbuf_printf(&sb, "5th: %u.%u%% idx: %u\n", sw4 / tot,
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sf4 / tot, si4);
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}
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}
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sbuf_trim(&sb);
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sbuf_finish(&sb);
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sysctl_handle_string(oidp, sbuf_data(&sb), sbuf_len(&sb), req);
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sbuf_delete(&sb);
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return (0);
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}
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static int
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sysctl_debug_umtx_chains_clear(SYSCTL_HANDLER_ARGS)
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{
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struct umtxq_chain *uc;
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u_int i, j;
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int clear, error;
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clear = 0;
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error = sysctl_handle_int(oidp, &clear, 0, req);
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if (error != 0 || req->newptr == NULL)
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return (error);
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if (clear != 0) {
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for (i = 0; i < 2; ++i) {
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for (j = 0; j < UMTX_CHAINS; ++j) {
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uc = &umtxq_chains[i][j];
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mtx_lock(&uc->uc_lock);
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uc->length = 0;
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uc->max_length = 0;
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mtx_unlock(&uc->uc_lock);
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}
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}
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}
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return (0);
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}
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SYSCTL_PROC(_debug_umtx_chains, OID_AUTO, clear,
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CTLTYPE_INT | CTLFLAG_RW | CTLFLAG_MPSAFE, 0, 0,
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sysctl_debug_umtx_chains_clear, "I",
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"Clear umtx chains statistics");
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SYSCTL_PROC(_debug_umtx_chains, OID_AUTO, peaks,
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CTLTYPE_STRING | CTLFLAG_RD | CTLFLAG_MPSAFE, 0, 0,
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sysctl_debug_umtx_chains_peaks, "A",
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"Highest peaks in chains max length");
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#endif
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static void
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umtxq_sysinit(void *arg __unused)
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{
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int i, j;
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umtx_pi_zone = uma_zcreate("umtx pi", sizeof(struct umtx_pi),
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NULL, NULL, NULL, NULL, UMA_ALIGN_PTR, 0);
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for (i = 0; i < 2; ++i) {
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for (j = 0; j < UMTX_CHAINS; ++j) {
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mtx_init(&umtxq_chains[i][j].uc_lock, "umtxql", NULL,
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MTX_DEF | MTX_DUPOK);
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LIST_INIT(&umtxq_chains[i][j].uc_queue[0]);
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LIST_INIT(&umtxq_chains[i][j].uc_queue[1]);
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LIST_INIT(&umtxq_chains[i][j].uc_spare_queue);
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TAILQ_INIT(&umtxq_chains[i][j].uc_pi_list);
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umtxq_chains[i][j].uc_busy = 0;
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umtxq_chains[i][j].uc_waiters = 0;
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#ifdef UMTX_PROFILING
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umtxq_chains[i][j].length = 0;
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umtxq_chains[i][j].max_length = 0;
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#endif
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}
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}
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#ifdef UMTX_PROFILING
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umtx_init_profiling();
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#endif
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mtx_init(&umtx_lock, "umtx lock", NULL, MTX_DEF);
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umtx_shm_init();
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}
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struct umtx_q *
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umtxq_alloc(void)
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{
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struct umtx_q *uq;
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uq = malloc(sizeof(struct umtx_q), M_UMTX, M_WAITOK | M_ZERO);
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uq->uq_spare_queue = malloc(sizeof(struct umtxq_queue), M_UMTX,
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M_WAITOK | M_ZERO);
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TAILQ_INIT(&uq->uq_spare_queue->head);
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TAILQ_INIT(&uq->uq_pi_contested);
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uq->uq_inherited_pri = PRI_MAX;
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return (uq);
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}
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void
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umtxq_free(struct umtx_q *uq)
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{
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MPASS(uq->uq_spare_queue != NULL);
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free(uq->uq_spare_queue, M_UMTX);
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free(uq, M_UMTX);
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}
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static inline void
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umtxq_hash(struct umtx_key *key)
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{
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unsigned n;
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n = (uintptr_t)key->info.both.a + key->info.both.b;
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key->hash = ((n * GOLDEN_RATIO_PRIME) >> UMTX_SHIFTS) % UMTX_CHAINS;
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}
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struct umtxq_chain *
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umtxq_getchain(struct umtx_key *key)
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{
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if (key->type <= TYPE_SEM)
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return (&umtxq_chains[1][key->hash]);
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return (&umtxq_chains[0][key->hash]);
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}
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/*
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* Set chain to busy state when following operation
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* may be blocked (kernel mutex can not be used).
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*/
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void
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umtxq_busy(struct umtx_key *key)
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{
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struct umtxq_chain *uc;
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uc = umtxq_getchain(key);
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mtx_assert(&uc->uc_lock, MA_OWNED);
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if (uc->uc_busy) {
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#ifdef SMP
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if (smp_cpus > 1) {
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int count = BUSY_SPINS;
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if (count > 0) {
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umtxq_unlock(key);
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while (uc->uc_busy && --count > 0)
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cpu_spinwait();
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umtxq_lock(key);
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}
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}
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#endif
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while (uc->uc_busy) {
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uc->uc_waiters++;
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msleep(uc, &uc->uc_lock, 0, "umtxqb", 0);
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uc->uc_waiters--;
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}
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}
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uc->uc_busy = 1;
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}
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/*
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* Unbusy a chain.
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*/
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void
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umtxq_unbusy(struct umtx_key *key)
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{
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struct umtxq_chain *uc;
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uc = umtxq_getchain(key);
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mtx_assert(&uc->uc_lock, MA_OWNED);
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KASSERT(uc->uc_busy != 0, ("not busy"));
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uc->uc_busy = 0;
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if (uc->uc_waiters)
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wakeup_one(uc);
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}
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void
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umtxq_unbusy_unlocked(struct umtx_key *key)
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{
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umtxq_lock(key);
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umtxq_unbusy(key);
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umtxq_unlock(key);
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}
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static struct umtxq_queue *
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umtxq_queue_lookup(struct umtx_key *key, int q)
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{
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struct umtxq_queue *uh;
|
|
struct umtxq_chain *uc;
|
|
|
|
uc = umtxq_getchain(key);
|
|
UMTXQ_LOCKED_ASSERT(uc);
|
|
LIST_FOREACH(uh, &uc->uc_queue[q], link) {
|
|
if (umtx_key_match(&uh->key, key))
|
|
return (uh);
|
|
}
|
|
|
|
return (NULL);
|
|
}
|
|
|
|
void
|
|
umtxq_insert_queue(struct umtx_q *uq, int q)
|
|
{
|
|
struct umtxq_queue *uh;
|
|
struct umtxq_chain *uc;
|
|
|
|
uc = umtxq_getchain(&uq->uq_key);
|
|
UMTXQ_LOCKED_ASSERT(uc);
|
|
KASSERT((uq->uq_flags & UQF_UMTXQ) == 0, ("umtx_q is already on queue"));
|
|
uh = umtxq_queue_lookup(&uq->uq_key, q);
|
|
if (uh != NULL) {
|
|
LIST_INSERT_HEAD(&uc->uc_spare_queue, uq->uq_spare_queue, link);
|
|
} else {
|
|
uh = uq->uq_spare_queue;
|
|
uh->key = uq->uq_key;
|
|
LIST_INSERT_HEAD(&uc->uc_queue[q], uh, link);
|
|
#ifdef UMTX_PROFILING
|
|
uc->length++;
|
|
if (uc->length > uc->max_length) {
|
|
uc->max_length = uc->length;
|
|
if (uc->max_length > max_length)
|
|
max_length = uc->max_length;
|
|
}
|
|
#endif
|
|
}
|
|
uq->uq_spare_queue = NULL;
|
|
|
|
TAILQ_INSERT_TAIL(&uh->head, uq, uq_link);
|
|
uh->length++;
|
|
uq->uq_flags |= UQF_UMTXQ;
|
|
uq->uq_cur_queue = uh;
|
|
return;
|
|
}
|
|
|
|
void
|
|
umtxq_remove_queue(struct umtx_q *uq, int q)
|
|
{
|
|
struct umtxq_chain *uc;
|
|
struct umtxq_queue *uh;
|
|
|
|
uc = umtxq_getchain(&uq->uq_key);
|
|
UMTXQ_LOCKED_ASSERT(uc);
|
|
if (uq->uq_flags & UQF_UMTXQ) {
|
|
uh = uq->uq_cur_queue;
|
|
TAILQ_REMOVE(&uh->head, uq, uq_link);
|
|
uh->length--;
|
|
uq->uq_flags &= ~UQF_UMTXQ;
|
|
if (TAILQ_EMPTY(&uh->head)) {
|
|
KASSERT(uh->length == 0,
|
|
("inconsistent umtxq_queue length"));
|
|
#ifdef UMTX_PROFILING
|
|
uc->length--;
|
|
#endif
|
|
LIST_REMOVE(uh, link);
|
|
} else {
|
|
uh = LIST_FIRST(&uc->uc_spare_queue);
|
|
KASSERT(uh != NULL, ("uc_spare_queue is empty"));
|
|
LIST_REMOVE(uh, link);
|
|
}
|
|
uq->uq_spare_queue = uh;
|
|
uq->uq_cur_queue = NULL;
|
|
}
|
|
}
|
|
|
|
/*
|
|
* Check if there are multiple waiters
|
|
*/
|
|
int
|
|
umtxq_count(struct umtx_key *key)
|
|
{
|
|
struct umtxq_queue *uh;
|
|
|
|
UMTXQ_LOCKED_ASSERT(umtxq_getchain(key));
|
|
uh = umtxq_queue_lookup(key, UMTX_SHARED_QUEUE);
|
|
if (uh != NULL)
|
|
return (uh->length);
|
|
return (0);
|
|
}
|
|
|
|
/*
|
|
* Check if there are multiple PI waiters and returns first
|
|
* waiter.
|
|
*/
|
|
static int
|
|
umtxq_count_pi(struct umtx_key *key, struct umtx_q **first)
|
|
{
|
|
struct umtxq_queue *uh;
|
|
|
|
*first = NULL;
|
|
UMTXQ_LOCKED_ASSERT(umtxq_getchain(key));
|
|
uh = umtxq_queue_lookup(key, UMTX_SHARED_QUEUE);
|
|
if (uh != NULL) {
|
|
*first = TAILQ_FIRST(&uh->head);
|
|
return (uh->length);
|
|
}
|
|
return (0);
|
|
}
|
|
|
|
/*
|
|
* Wake up threads waiting on an userland object by a bit mask.
|
|
*/
|
|
int
|
|
umtxq_signal_mask(struct umtx_key *key, int n_wake, u_int bitset)
|
|
{
|
|
struct umtxq_queue *uh;
|
|
struct umtx_q *uq, *uq_temp;
|
|
int ret;
|
|
|
|
ret = 0;
|
|
UMTXQ_LOCKED_ASSERT(umtxq_getchain(key));
|
|
uh = umtxq_queue_lookup(key, UMTX_SHARED_QUEUE);
|
|
if (uh == NULL)
|
|
return (0);
|
|
TAILQ_FOREACH_SAFE(uq, &uh->head, uq_link, uq_temp) {
|
|
if ((uq->uq_bitset & bitset) == 0)
|
|
continue;
|
|
umtxq_remove_queue(uq, UMTX_SHARED_QUEUE);
|
|
wakeup_one(uq);
|
|
if (++ret >= n_wake)
|
|
break;
|
|
}
|
|
return (ret);
|
|
}
|
|
|
|
/*
|
|
* Wake up threads waiting on an userland object.
|
|
*/
|
|
|
|
static int
|
|
umtxq_signal_queue(struct umtx_key *key, int n_wake, int q)
|
|
{
|
|
struct umtxq_queue *uh;
|
|
struct umtx_q *uq;
|
|
int ret;
|
|
|
|
ret = 0;
|
|
UMTXQ_LOCKED_ASSERT(umtxq_getchain(key));
|
|
uh = umtxq_queue_lookup(key, q);
|
|
if (uh != NULL) {
|
|
while ((uq = TAILQ_FIRST(&uh->head)) != NULL) {
|
|
umtxq_remove_queue(uq, q);
|
|
wakeup(uq);
|
|
if (++ret >= n_wake)
|
|
return (ret);
|
|
}
|
|
}
|
|
return (ret);
|
|
}
|
|
|
|
/*
|
|
* Wake up specified thread.
|
|
*/
|
|
static inline void
|
|
umtxq_signal_thread(struct umtx_q *uq)
|
|
{
|
|
|
|
UMTXQ_LOCKED_ASSERT(umtxq_getchain(&uq->uq_key));
|
|
umtxq_remove(uq);
|
|
wakeup(uq);
|
|
}
|
|
|
|
/*
|
|
* Wake up a maximum of n_wake threads that are waiting on an userland
|
|
* object identified by key. The remaining threads are removed from queue
|
|
* identified by key and added to the queue identified by key2 (requeued).
|
|
* The n_requeue specifies an upper limit on the number of threads that
|
|
* are requeued to the second queue.
|
|
*/
|
|
int
|
|
umtxq_requeue(struct umtx_key *key, int n_wake, struct umtx_key *key2,
|
|
int n_requeue)
|
|
{
|
|
struct umtxq_queue *uh;
|
|
struct umtx_q *uq, *uq_temp;
|
|
int ret;
|
|
|
|
ret = 0;
|
|
UMTXQ_LOCKED_ASSERT(umtxq_getchain(key));
|
|
UMTXQ_LOCKED_ASSERT(umtxq_getchain(key2));
|
|
uh = umtxq_queue_lookup(key, UMTX_SHARED_QUEUE);
|
|
if (uh == NULL)
|
|
return (0);
|
|
TAILQ_FOREACH_SAFE(uq, &uh->head, uq_link, uq_temp) {
|
|
if (++ret <= n_wake) {
|
|
umtxq_remove(uq);
|
|
wakeup_one(uq);
|
|
} else {
|
|
umtxq_remove(uq);
|
|
uq->uq_key = *key2;
|
|
umtxq_insert(uq);
|
|
if (ret - n_wake == n_requeue)
|
|
break;
|
|
}
|
|
}
|
|
return (ret);
|
|
}
|
|
|
|
static inline int
|
|
tstohz(const struct timespec *tsp)
|
|
{
|
|
struct timeval tv;
|
|
|
|
TIMESPEC_TO_TIMEVAL(&tv, tsp);
|
|
return tvtohz(&tv);
|
|
}
|
|
|
|
void
|
|
umtx_abs_timeout_init(struct umtx_abs_timeout *timo, int clockid,
|
|
int absolute, const struct timespec *timeout)
|
|
{
|
|
|
|
timo->clockid = clockid;
|
|
if (!absolute) {
|
|
timo->is_abs_real = false;
|
|
kern_clock_gettime(curthread, timo->clockid, &timo->cur);
|
|
timespecadd(&timo->cur, timeout, &timo->end);
|
|
} else {
|
|
timo->end = *timeout;
|
|
timo->is_abs_real = clockid == CLOCK_REALTIME ||
|
|
clockid == CLOCK_REALTIME_FAST ||
|
|
clockid == CLOCK_REALTIME_PRECISE ||
|
|
clockid == CLOCK_SECOND;
|
|
}
|
|
}
|
|
|
|
static void
|
|
umtx_abs_timeout_init2(struct umtx_abs_timeout *timo,
|
|
const struct _umtx_time *umtxtime)
|
|
{
|
|
|
|
umtx_abs_timeout_init(timo, umtxtime->_clockid,
|
|
(umtxtime->_flags & UMTX_ABSTIME) != 0, &umtxtime->_timeout);
|
|
}
|
|
|
|
static int
|
|
umtx_abs_timeout_getsbt(struct umtx_abs_timeout *timo, sbintime_t *sbt,
|
|
int *flags)
|
|
{
|
|
struct bintime bt, bbt;
|
|
struct timespec tts;
|
|
sbintime_t rem;
|
|
|
|
switch (timo->clockid) {
|
|
|
|
/* Clocks that can be converted into absolute time. */
|
|
case CLOCK_REALTIME:
|
|
case CLOCK_REALTIME_PRECISE:
|
|
case CLOCK_REALTIME_FAST:
|
|
case CLOCK_MONOTONIC:
|
|
case CLOCK_MONOTONIC_PRECISE:
|
|
case CLOCK_MONOTONIC_FAST:
|
|
case CLOCK_UPTIME:
|
|
case CLOCK_UPTIME_PRECISE:
|
|
case CLOCK_UPTIME_FAST:
|
|
case CLOCK_SECOND:
|
|
timespec2bintime(&timo->end, &bt);
|
|
switch (timo->clockid) {
|
|
case CLOCK_REALTIME:
|
|
case CLOCK_REALTIME_PRECISE:
|
|
case CLOCK_REALTIME_FAST:
|
|
case CLOCK_SECOND:
|
|
getboottimebin(&bbt);
|
|
bintime_sub(&bt, &bbt);
|
|
break;
|
|
}
|
|
if (bt.sec < 0)
|
|
return (ETIMEDOUT);
|
|
if (bt.sec >= (SBT_MAX >> 32)) {
|
|
*sbt = 0;
|
|
*flags = 0;
|
|
return (0);
|
|
}
|
|
*sbt = bttosbt(bt);
|
|
|
|
/*
|
|
* Check if the absolute time should be aligned to
|
|
* avoid firing multiple timer events in non-periodic
|
|
* timer mode.
|
|
*/
|
|
switch (timo->clockid) {
|
|
case CLOCK_REALTIME_FAST:
|
|
case CLOCK_MONOTONIC_FAST:
|
|
case CLOCK_UPTIME_FAST:
|
|
rem = *sbt % tc_tick_sbt;
|
|
if (__predict_true(rem != 0))
|
|
*sbt += tc_tick_sbt - rem;
|
|
break;
|
|
case CLOCK_SECOND:
|
|
rem = *sbt % SBT_1S;
|
|
if (__predict_true(rem != 0))
|
|
*sbt += SBT_1S - rem;
|
|
break;
|
|
}
|
|
*flags = C_ABSOLUTE;
|
|
return (0);
|
|
|
|
/* Clocks that has to be periodically polled. */
|
|
case CLOCK_VIRTUAL:
|
|
case CLOCK_PROF:
|
|
case CLOCK_THREAD_CPUTIME_ID:
|
|
case CLOCK_PROCESS_CPUTIME_ID:
|
|
default:
|
|
kern_clock_gettime(curthread, timo->clockid, &timo->cur);
|
|
if (timespeccmp(&timo->end, &timo->cur, <=))
|
|
return (ETIMEDOUT);
|
|
timespecsub(&timo->end, &timo->cur, &tts);
|
|
*sbt = tick_sbt * tstohz(&tts);
|
|
*flags = C_HARDCLOCK;
|
|
return (0);
|
|
}
|
|
}
|
|
|
|
static uint32_t
|
|
umtx_unlock_val(uint32_t flags, bool rb)
|
|
{
|
|
|
|
if (rb)
|
|
return (UMUTEX_RB_OWNERDEAD);
|
|
else if ((flags & UMUTEX_NONCONSISTENT) != 0)
|
|
return (UMUTEX_RB_NOTRECOV);
|
|
else
|
|
return (UMUTEX_UNOWNED);
|
|
|
|
}
|
|
|
|
/*
|
|
* Put thread into sleep state, before sleeping, check if
|
|
* thread was removed from umtx queue.
|
|
*/
|
|
int
|
|
umtxq_sleep(struct umtx_q *uq, const char *wmesg,
|
|
struct umtx_abs_timeout *timo)
|
|
{
|
|
struct umtxq_chain *uc;
|
|
sbintime_t sbt = 0;
|
|
int error, flags = 0;
|
|
|
|
uc = umtxq_getchain(&uq->uq_key);
|
|
UMTXQ_LOCKED_ASSERT(uc);
|
|
for (;;) {
|
|
if (!(uq->uq_flags & UQF_UMTXQ)) {
|
|
error = 0;
|
|
break;
|
|
}
|
|
if (timo != NULL) {
|
|
if (timo->is_abs_real)
|
|
curthread->td_rtcgen =
|
|
atomic_load_acq_int(&rtc_generation);
|
|
error = umtx_abs_timeout_getsbt(timo, &sbt, &flags);
|
|
if (error != 0)
|
|
break;
|
|
}
|
|
error = msleep_sbt(uq, &uc->uc_lock, PCATCH | PDROP, wmesg,
|
|
sbt, 0, flags);
|
|
uc = umtxq_getchain(&uq->uq_key);
|
|
mtx_lock(&uc->uc_lock);
|
|
if (error == EINTR || error == ERESTART)
|
|
break;
|
|
if (error == EWOULDBLOCK && (flags & C_ABSOLUTE) != 0) {
|
|
error = ETIMEDOUT;
|
|
break;
|
|
}
|
|
}
|
|
|
|
curthread->td_rtcgen = 0;
|
|
return (error);
|
|
}
|
|
|
|
/*
|
|
* Convert userspace address into unique logical address.
|
|
*/
|
|
int
|
|
umtx_key_get(const void *addr, int type, int share, struct umtx_key *key)
|
|
{
|
|
struct thread *td = curthread;
|
|
vm_map_t map;
|
|
vm_map_entry_t entry;
|
|
vm_pindex_t pindex;
|
|
vm_prot_t prot;
|
|
boolean_t wired;
|
|
|
|
key->type = type;
|
|
if (share == THREAD_SHARE) {
|
|
key->shared = 0;
|
|
key->info.private.vs = td->td_proc->p_vmspace;
|
|
key->info.private.addr = (uintptr_t)addr;
|
|
} else {
|
|
MPASS(share == PROCESS_SHARE || share == AUTO_SHARE);
|
|
map = &td->td_proc->p_vmspace->vm_map;
|
|
if (vm_map_lookup(&map, (vm_offset_t)addr, VM_PROT_WRITE,
|
|
&entry, &key->info.shared.object, &pindex, &prot,
|
|
&wired) != KERN_SUCCESS) {
|
|
return (EFAULT);
|
|
}
|
|
|
|
if ((share == PROCESS_SHARE) ||
|
|
(share == AUTO_SHARE &&
|
|
VM_INHERIT_SHARE == entry->inheritance)) {
|
|
key->shared = 1;
|
|
key->info.shared.offset = (vm_offset_t)addr -
|
|
entry->start + entry->offset;
|
|
vm_object_reference(key->info.shared.object);
|
|
} else {
|
|
key->shared = 0;
|
|
key->info.private.vs = td->td_proc->p_vmspace;
|
|
key->info.private.addr = (uintptr_t)addr;
|
|
}
|
|
vm_map_lookup_done(map, entry);
|
|
}
|
|
|
|
umtxq_hash(key);
|
|
return (0);
|
|
}
|
|
|
|
/*
|
|
* Release key.
|
|
*/
|
|
void
|
|
umtx_key_release(struct umtx_key *key)
|
|
{
|
|
if (key->shared)
|
|
vm_object_deallocate(key->info.shared.object);
|
|
}
|
|
|
|
#ifdef COMPAT_FREEBSD10
|
|
/*
|
|
* Lock a umtx object.
|
|
*/
|
|
static int
|
|
do_lock_umtx(struct thread *td, struct umtx *umtx, u_long id,
|
|
const struct timespec *timeout)
|
|
{
|
|
struct umtx_abs_timeout timo;
|
|
struct umtx_q *uq;
|
|
u_long owner;
|
|
u_long old;
|
|
int error = 0;
|
|
|
|
uq = td->td_umtxq;
|
|
if (timeout != NULL)
|
|
umtx_abs_timeout_init(&timo, CLOCK_REALTIME, 0, timeout);
|
|
|
|
/*
|
|
* Care must be exercised when dealing with umtx structure. It
|
|
* can fault on any access.
|
|
*/
|
|
for (;;) {
|
|
/*
|
|
* Try the uncontested case. This should be done in userland.
|
|
*/
|
|
owner = casuword(&umtx->u_owner, UMTX_UNOWNED, id);
|
|
|
|
/* The acquire succeeded. */
|
|
if (owner == UMTX_UNOWNED)
|
|
return (0);
|
|
|
|
/* The address was invalid. */
|
|
if (owner == -1)
|
|
return (EFAULT);
|
|
|
|
/* If no one owns it but it is contested try to acquire it. */
|
|
if (owner == UMTX_CONTESTED) {
|
|
owner = casuword(&umtx->u_owner,
|
|
UMTX_CONTESTED, id | UMTX_CONTESTED);
|
|
|
|
if (owner == UMTX_CONTESTED)
|
|
return (0);
|
|
|
|
/* The address was invalid. */
|
|
if (owner == -1)
|
|
return (EFAULT);
|
|
|
|
error = thread_check_susp(td, false);
|
|
if (error != 0)
|
|
break;
|
|
|
|
/* If this failed the lock has changed, restart. */
|
|
continue;
|
|
}
|
|
|
|
/*
|
|
* If we caught a signal, we have retried and now
|
|
* exit immediately.
|
|
*/
|
|
if (error != 0)
|
|
break;
|
|
|
|
if ((error = umtx_key_get(umtx, TYPE_SIMPLE_LOCK,
|
|
AUTO_SHARE, &uq->uq_key)) != 0)
|
|
return (error);
|
|
|
|
umtxq_lock(&uq->uq_key);
|
|
umtxq_busy(&uq->uq_key);
|
|
umtxq_insert(uq);
|
|
umtxq_unbusy(&uq->uq_key);
|
|
umtxq_unlock(&uq->uq_key);
|
|
|
|
/*
|
|
* Set the contested bit so that a release in user space
|
|
* knows to use the system call for unlock. If this fails
|
|
* either some one else has acquired the lock or it has been
|
|
* released.
|
|
*/
|
|
old = casuword(&umtx->u_owner, owner, owner | UMTX_CONTESTED);
|
|
|
|
/* The address was invalid. */
|
|
if (old == -1) {
|
|
umtxq_lock(&uq->uq_key);
|
|
umtxq_remove(uq);
|
|
umtxq_unlock(&uq->uq_key);
|
|
umtx_key_release(&uq->uq_key);
|
|
return (EFAULT);
|
|
}
|
|
|
|
/*
|
|
* We set the contested bit, sleep. Otherwise the lock changed
|
|
* and we need to retry or we lost a race to the thread
|
|
* unlocking the umtx.
|
|
*/
|
|
umtxq_lock(&uq->uq_key);
|
|
if (old == owner)
|
|
error = umtxq_sleep(uq, "umtx", timeout == NULL ? NULL :
|
|
&timo);
|
|
umtxq_remove(uq);
|
|
umtxq_unlock(&uq->uq_key);
|
|
umtx_key_release(&uq->uq_key);
|
|
|
|
if (error == 0)
|
|
error = thread_check_susp(td, false);
|
|
}
|
|
|
|
if (timeout == NULL) {
|
|
/* Mutex locking is restarted if it is interrupted. */
|
|
if (error == EINTR)
|
|
error = ERESTART;
|
|
} else {
|
|
/* Timed-locking is not restarted. */
|
|
if (error == ERESTART)
|
|
error = EINTR;
|
|
}
|
|
return (error);
|
|
}
|
|
|
|
/*
|
|
* Unlock a umtx object.
|
|
*/
|
|
static int
|
|
do_unlock_umtx(struct thread *td, struct umtx *umtx, u_long id)
|
|
{
|
|
struct umtx_key key;
|
|
u_long owner;
|
|
u_long old;
|
|
int error;
|
|
int count;
|
|
|
|
/*
|
|
* Make sure we own this mtx.
|
|
*/
|
|
owner = fuword(__DEVOLATILE(u_long *, &umtx->u_owner));
|
|
if (owner == -1)
|
|
return (EFAULT);
|
|
|
|
if ((owner & ~UMTX_CONTESTED) != id)
|
|
return (EPERM);
|
|
|
|
/* This should be done in userland */
|
|
if ((owner & UMTX_CONTESTED) == 0) {
|
|
old = casuword(&umtx->u_owner, owner, UMTX_UNOWNED);
|
|
if (old == -1)
|
|
return (EFAULT);
|
|
if (old == owner)
|
|
return (0);
|
|
owner = old;
|
|
}
|
|
|
|
/* We should only ever be in here for contested locks */
|
|
if ((error = umtx_key_get(umtx, TYPE_SIMPLE_LOCK, AUTO_SHARE,
|
|
&key)) != 0)
|
|
return (error);
|
|
|
|
umtxq_lock(&key);
|
|
umtxq_busy(&key);
|
|
count = umtxq_count(&key);
|
|
umtxq_unlock(&key);
|
|
|
|
/*
|
|
* When unlocking the umtx, it must be marked as unowned if
|
|
* there is zero or one thread only waiting for it.
|
|
* Otherwise, it must be marked as contested.
|
|
*/
|
|
old = casuword(&umtx->u_owner, owner,
|
|
count <= 1 ? UMTX_UNOWNED : UMTX_CONTESTED);
|
|
umtxq_lock(&key);
|
|
umtxq_signal(&key,1);
|
|
umtxq_unbusy(&key);
|
|
umtxq_unlock(&key);
|
|
umtx_key_release(&key);
|
|
if (old == -1)
|
|
return (EFAULT);
|
|
if (old != owner)
|
|
return (EINVAL);
|
|
return (0);
|
|
}
|
|
|
|
#ifdef COMPAT_FREEBSD32
|
|
|
|
/*
|
|
* Lock a umtx object.
|
|
*/
|
|
static int
|
|
do_lock_umtx32(struct thread *td, uint32_t *m, uint32_t id,
|
|
const struct timespec *timeout)
|
|
{
|
|
struct umtx_abs_timeout timo;
|
|
struct umtx_q *uq;
|
|
uint32_t owner;
|
|
uint32_t old;
|
|
int error = 0;
|
|
|
|
uq = td->td_umtxq;
|
|
|
|
if (timeout != NULL)
|
|
umtx_abs_timeout_init(&timo, CLOCK_REALTIME, 0, timeout);
|
|
|
|
/*
|
|
* Care must be exercised when dealing with umtx structure. It
|
|
* can fault on any access.
|
|
*/
|
|
for (;;) {
|
|
/*
|
|
* Try the uncontested case. This should be done in userland.
|
|
*/
|
|
owner = casuword32(m, UMUTEX_UNOWNED, id);
|
|
|
|
/* The acquire succeeded. */
|
|
if (owner == UMUTEX_UNOWNED)
|
|
return (0);
|
|
|
|
/* The address was invalid. */
|
|
if (owner == -1)
|
|
return (EFAULT);
|
|
|
|
/* If no one owns it but it is contested try to acquire it. */
|
|
if (owner == UMUTEX_CONTESTED) {
|
|
owner = casuword32(m,
|
|
UMUTEX_CONTESTED, id | UMUTEX_CONTESTED);
|
|
if (owner == UMUTEX_CONTESTED)
|
|
return (0);
|
|
|
|
/* The address was invalid. */
|
|
if (owner == -1)
|
|
return (EFAULT);
|
|
|
|
error = thread_check_susp(td, false);
|
|
if (error != 0)
|
|
break;
|
|
|
|
/* If this failed the lock has changed, restart. */
|
|
continue;
|
|
}
|
|
|
|
/*
|
|
* If we caught a signal, we have retried and now
|
|
* exit immediately.
|
|
*/
|
|
if (error != 0)
|
|
return (error);
|
|
|
|
if ((error = umtx_key_get(m, TYPE_SIMPLE_LOCK,
|
|
AUTO_SHARE, &uq->uq_key)) != 0)
|
|
return (error);
|
|
|
|
umtxq_lock(&uq->uq_key);
|
|
umtxq_busy(&uq->uq_key);
|
|
umtxq_insert(uq);
|
|
umtxq_unbusy(&uq->uq_key);
|
|
umtxq_unlock(&uq->uq_key);
|
|
|
|
/*
|
|
* Set the contested bit so that a release in user space
|
|
* knows to use the system call for unlock. If this fails
|
|
* either some one else has acquired the lock or it has been
|
|
* released.
|
|
*/
|
|
old = casuword32(m, owner, owner | UMUTEX_CONTESTED);
|
|
|
|
/* The address was invalid. */
|
|
if (old == -1) {
|
|
umtxq_lock(&uq->uq_key);
|
|
umtxq_remove(uq);
|
|
umtxq_unlock(&uq->uq_key);
|
|
umtx_key_release(&uq->uq_key);
|
|
return (EFAULT);
|
|
}
|
|
|
|
/*
|
|
* We set the contested bit, sleep. Otherwise the lock changed
|
|
* and we need to retry or we lost a race to the thread
|
|
* unlocking the umtx.
|
|
*/
|
|
umtxq_lock(&uq->uq_key);
|
|
if (old == owner)
|
|
error = umtxq_sleep(uq, "umtx", timeout == NULL ?
|
|
NULL : &timo);
|
|
umtxq_remove(uq);
|
|
umtxq_unlock(&uq->uq_key);
|
|
umtx_key_release(&uq->uq_key);
|
|
|
|
if (error == 0)
|
|
error = thread_check_susp(td, false);
|
|
}
|
|
|
|
if (timeout == NULL) {
|
|
/* Mutex locking is restarted if it is interrupted. */
|
|
if (error == EINTR)
|
|
error = ERESTART;
|
|
} else {
|
|
/* Timed-locking is not restarted. */
|
|
if (error == ERESTART)
|
|
error = EINTR;
|
|
}
|
|
return (error);
|
|
}
|
|
|
|
/*
|
|
* Unlock a umtx object.
|
|
*/
|
|
static int
|
|
do_unlock_umtx32(struct thread *td, uint32_t *m, uint32_t id)
|
|
{
|
|
struct umtx_key key;
|
|
uint32_t owner;
|
|
uint32_t old;
|
|
int error;
|
|
int count;
|
|
|
|
/*
|
|
* Make sure we own this mtx.
|
|
*/
|
|
owner = fuword32(m);
|
|
if (owner == -1)
|
|
return (EFAULT);
|
|
|
|
if ((owner & ~UMUTEX_CONTESTED) != id)
|
|
return (EPERM);
|
|
|
|
/* This should be done in userland */
|
|
if ((owner & UMUTEX_CONTESTED) == 0) {
|
|
old = casuword32(m, owner, UMUTEX_UNOWNED);
|
|
if (old == -1)
|
|
return (EFAULT);
|
|
if (old == owner)
|
|
return (0);
|
|
owner = old;
|
|
}
|
|
|
|
/* We should only ever be in here for contested locks */
|
|
if ((error = umtx_key_get(m, TYPE_SIMPLE_LOCK, AUTO_SHARE,
|
|
&key)) != 0)
|
|
return (error);
|
|
|
|
umtxq_lock(&key);
|
|
umtxq_busy(&key);
|
|
count = umtxq_count(&key);
|
|
umtxq_unlock(&key);
|
|
|
|
/*
|
|
* When unlocking the umtx, it must be marked as unowned if
|
|
* there is zero or one thread only waiting for it.
|
|
* Otherwise, it must be marked as contested.
|
|
*/
|
|
old = casuword32(m, owner,
|
|
count <= 1 ? UMUTEX_UNOWNED : UMUTEX_CONTESTED);
|
|
umtxq_lock(&key);
|
|
umtxq_signal(&key,1);
|
|
umtxq_unbusy(&key);
|
|
umtxq_unlock(&key);
|
|
umtx_key_release(&key);
|
|
if (old == -1)
|
|
return (EFAULT);
|
|
if (old != owner)
|
|
return (EINVAL);
|
|
return (0);
|
|
}
|
|
#endif /* COMPAT_FREEBSD32 */
|
|
#endif /* COMPAT_FREEBSD10 */
|
|
|
|
/*
|
|
* Fetch and compare value, sleep on the address if value is not changed.
|
|
*/
|
|
static int
|
|
do_wait(struct thread *td, void *addr, u_long id,
|
|
struct _umtx_time *timeout, int compat32, int is_private)
|
|
{
|
|
struct umtx_abs_timeout timo;
|
|
struct umtx_q *uq;
|
|
u_long tmp;
|
|
uint32_t tmp32;
|
|
int error = 0;
|
|
|
|
uq = td->td_umtxq;
|
|
if ((error = umtx_key_get(addr, TYPE_SIMPLE_WAIT,
|
|
is_private ? THREAD_SHARE : AUTO_SHARE, &uq->uq_key)) != 0)
|
|
return (error);
|
|
|
|
if (timeout != NULL)
|
|
umtx_abs_timeout_init2(&timo, timeout);
|
|
|
|
umtxq_lock(&uq->uq_key);
|
|
umtxq_insert(uq);
|
|
umtxq_unlock(&uq->uq_key);
|
|
if (compat32 == 0) {
|
|
error = fueword(addr, &tmp);
|
|
if (error != 0)
|
|
error = EFAULT;
|
|
} else {
|
|
error = fueword32(addr, &tmp32);
|
|
if (error == 0)
|
|
tmp = tmp32;
|
|
else
|
|
error = EFAULT;
|
|
}
|
|
umtxq_lock(&uq->uq_key);
|
|
if (error == 0) {
|
|
if (tmp == id)
|
|
error = umtxq_sleep(uq, "uwait", timeout == NULL ?
|
|
NULL : &timo);
|
|
if ((uq->uq_flags & UQF_UMTXQ) == 0)
|
|
error = 0;
|
|
else
|
|
umtxq_remove(uq);
|
|
} else if ((uq->uq_flags & UQF_UMTXQ) != 0) {
|
|
umtxq_remove(uq);
|
|
}
|
|
umtxq_unlock(&uq->uq_key);
|
|
umtx_key_release(&uq->uq_key);
|
|
if (error == ERESTART)
|
|
error = EINTR;
|
|
return (error);
|
|
}
|
|
|
|
/*
|
|
* Wake up threads sleeping on the specified address.
|
|
*/
|
|
int
|
|
kern_umtx_wake(struct thread *td, void *uaddr, int n_wake, int is_private)
|
|
{
|
|
struct umtx_key key;
|
|
int ret;
|
|
|
|
if ((ret = umtx_key_get(uaddr, TYPE_SIMPLE_WAIT,
|
|
is_private ? THREAD_SHARE : AUTO_SHARE, &key)) != 0)
|
|
return (ret);
|
|
umtxq_lock(&key);
|
|
umtxq_signal(&key, n_wake);
|
|
umtxq_unlock(&key);
|
|
umtx_key_release(&key);
|
|
return (0);
|
|
}
|
|
|
|
/*
|
|
* Lock PTHREAD_PRIO_NONE protocol POSIX mutex.
|
|
*/
|
|
static int
|
|
do_lock_normal(struct thread *td, struct umutex *m, uint32_t flags,
|
|
struct _umtx_time *timeout, int mode)
|
|
{
|
|
struct umtx_abs_timeout timo;
|
|
struct umtx_q *uq;
|
|
uint32_t owner, old, id;
|
|
int error, rv;
|
|
|
|
id = td->td_tid;
|
|
uq = td->td_umtxq;
|
|
error = 0;
|
|
if (timeout != NULL)
|
|
umtx_abs_timeout_init2(&timo, timeout);
|
|
|
|
/*
|
|
* Care must be exercised when dealing with umtx structure. It
|
|
* can fault on any access.
|
|
*/
|
|
for (;;) {
|
|
rv = fueword32(&m->m_owner, &owner);
|
|
if (rv == -1)
|
|
return (EFAULT);
|
|
if (mode == _UMUTEX_WAIT) {
|
|
if (owner == UMUTEX_UNOWNED ||
|
|
owner == UMUTEX_CONTESTED ||
|
|
owner == UMUTEX_RB_OWNERDEAD ||
|
|
owner == UMUTEX_RB_NOTRECOV)
|
|
return (0);
|
|
} else {
|
|
/*
|
|
* Robust mutex terminated. Kernel duty is to
|
|
* return EOWNERDEAD to the userspace. The
|
|
* umutex.m_flags UMUTEX_NONCONSISTENT is set
|
|
* by the common userspace code.
|
|
*/
|
|
if (owner == UMUTEX_RB_OWNERDEAD) {
|
|
rv = casueword32(&m->m_owner,
|
|
UMUTEX_RB_OWNERDEAD, &owner,
|
|
id | UMUTEX_CONTESTED);
|
|
if (rv == -1)
|
|
return (EFAULT);
|
|
if (rv == 0) {
|
|
MPASS(owner == UMUTEX_RB_OWNERDEAD);
|
|
return (EOWNERDEAD); /* success */
|
|
}
|
|
MPASS(rv == 1);
|
|
rv = thread_check_susp(td, false);
|
|
if (rv != 0)
|
|
return (rv);
|
|
continue;
|
|
}
|
|
if (owner == UMUTEX_RB_NOTRECOV)
|
|
return (ENOTRECOVERABLE);
|
|
|
|
/*
|
|
* Try the uncontested case. This should be
|
|
* done in userland.
|
|
*/
|
|
rv = casueword32(&m->m_owner, UMUTEX_UNOWNED,
|
|
&owner, id);
|
|
/* The address was invalid. */
|
|
if (rv == -1)
|
|
return (EFAULT);
|
|
|
|
/* The acquire succeeded. */
|
|
if (rv == 0) {
|
|
MPASS(owner == UMUTEX_UNOWNED);
|
|
return (0);
|
|
}
|
|
|
|
/*
|
|
* If no one owns it but it is contested try
|
|
* to acquire it.
|
|
*/
|
|
MPASS(rv == 1);
|
|
if (owner == UMUTEX_CONTESTED) {
|
|
rv = casueword32(&m->m_owner,
|
|
UMUTEX_CONTESTED, &owner,
|
|
id | UMUTEX_CONTESTED);
|
|
/* The address was invalid. */
|
|
if (rv == -1)
|
|
return (EFAULT);
|
|
if (rv == 0) {
|
|
MPASS(owner == UMUTEX_CONTESTED);
|
|
return (0);
|
|
}
|
|
if (rv == 1) {
|
|
rv = thread_check_susp(td, false);
|
|
if (rv != 0)
|
|
return (rv);
|
|
}
|
|
|
|
/*
|
|
* If this failed the lock has
|
|
* changed, restart.
|
|
*/
|
|
continue;
|
|
}
|
|
|
|
/* rv == 1 but not contested, likely store failure */
|
|
rv = thread_check_susp(td, false);
|
|
if (rv != 0)
|
|
return (rv);
|
|
}
|
|
|
|
if (mode == _UMUTEX_TRY)
|
|
return (EBUSY);
|
|
|
|
/*
|
|
* If we caught a signal, we have retried and now
|
|
* exit immediately.
|
|
*/
|
|
if (error != 0)
|
|
return (error);
|
|
|
|
if ((error = umtx_key_get(m, TYPE_NORMAL_UMUTEX,
|
|
GET_SHARE(flags), &uq->uq_key)) != 0)
|
|
return (error);
|
|
|
|
umtxq_lock(&uq->uq_key);
|
|
umtxq_busy(&uq->uq_key);
|
|
umtxq_insert(uq);
|
|
umtxq_unlock(&uq->uq_key);
|
|
|
|
/*
|
|
* Set the contested bit so that a release in user space
|
|
* knows to use the system call for unlock. If this fails
|
|
* either some one else has acquired the lock or it has been
|
|
* released.
|
|
*/
|
|
rv = casueword32(&m->m_owner, owner, &old,
|
|
owner | UMUTEX_CONTESTED);
|
|
|
|
/* The address was invalid or casueword failed to store. */
|
|
if (rv == -1 || rv == 1) {
|
|
umtxq_lock(&uq->uq_key);
|
|
umtxq_remove(uq);
|
|
umtxq_unbusy(&uq->uq_key);
|
|
umtxq_unlock(&uq->uq_key);
|
|
umtx_key_release(&uq->uq_key);
|
|
if (rv == -1)
|
|
return (EFAULT);
|
|
if (rv == 1) {
|
|
rv = thread_check_susp(td, false);
|
|
if (rv != 0)
|
|
return (rv);
|
|
}
|
|
continue;
|
|
}
|
|
|
|
/*
|
|
* We set the contested bit, sleep. Otherwise the lock changed
|
|
* and we need to retry or we lost a race to the thread
|
|
* unlocking the umtx.
|
|
*/
|
|
umtxq_lock(&uq->uq_key);
|
|
umtxq_unbusy(&uq->uq_key);
|
|
MPASS(old == owner);
|
|
error = umtxq_sleep(uq, "umtxn", timeout == NULL ?
|
|
NULL : &timo);
|
|
umtxq_remove(uq);
|
|
umtxq_unlock(&uq->uq_key);
|
|
umtx_key_release(&uq->uq_key);
|
|
|
|
if (error == 0)
|
|
error = thread_check_susp(td, false);
|
|
}
|
|
|
|
return (0);
|
|
}
|
|
|
|
/*
|
|
* Unlock PTHREAD_PRIO_NONE protocol POSIX mutex.
|
|
*/
|
|
static int
|
|
do_unlock_normal(struct thread *td, struct umutex *m, uint32_t flags, bool rb)
|
|
{
|
|
struct umtx_key key;
|
|
uint32_t owner, old, id, newlock;
|
|
int error, count;
|
|
|
|
id = td->td_tid;
|
|
|
|
again:
|
|
/*
|
|
* Make sure we own this mtx.
|
|
*/
|
|
error = fueword32(&m->m_owner, &owner);
|
|
if (error == -1)
|
|
return (EFAULT);
|
|
|
|
if ((owner & ~UMUTEX_CONTESTED) != id)
|
|
return (EPERM);
|
|
|
|
newlock = umtx_unlock_val(flags, rb);
|
|
if ((owner & UMUTEX_CONTESTED) == 0) {
|
|
error = casueword32(&m->m_owner, owner, &old, newlock);
|
|
if (error == -1)
|
|
return (EFAULT);
|
|
if (error == 1) {
|
|
error = thread_check_susp(td, false);
|
|
if (error != 0)
|
|
return (error);
|
|
goto again;
|
|
}
|
|
MPASS(old == owner);
|
|
return (0);
|
|
}
|
|
|
|
/* We should only ever be in here for contested locks */
|
|
if ((error = umtx_key_get(m, TYPE_NORMAL_UMUTEX, GET_SHARE(flags),
|
|
&key)) != 0)
|
|
return (error);
|
|
|
|
umtxq_lock(&key);
|
|
umtxq_busy(&key);
|
|
count = umtxq_count(&key);
|
|
umtxq_unlock(&key);
|
|
|
|
/*
|
|
* When unlocking the umtx, it must be marked as unowned if
|
|
* there is zero or one thread only waiting for it.
|
|
* Otherwise, it must be marked as contested.
|
|
*/
|
|
if (count > 1)
|
|
newlock |= UMUTEX_CONTESTED;
|
|
error = casueword32(&m->m_owner, owner, &old, newlock);
|
|
umtxq_lock(&key);
|
|
umtxq_signal(&key, 1);
|
|
umtxq_unbusy(&key);
|
|
umtxq_unlock(&key);
|
|
umtx_key_release(&key);
|
|
if (error == -1)
|
|
return (EFAULT);
|
|
if (error == 1) {
|
|
if (old != owner)
|
|
return (EINVAL);
|
|
error = thread_check_susp(td, false);
|
|
if (error != 0)
|
|
return (error);
|
|
goto again;
|
|
}
|
|
return (0);
|
|
}
|
|
|
|
/*
|
|
* Check if the mutex is available and wake up a waiter,
|
|
* only for simple mutex.
|
|
*/
|
|
static int
|
|
do_wake_umutex(struct thread *td, struct umutex *m)
|
|
{
|
|
struct umtx_key key;
|
|
uint32_t owner;
|
|
uint32_t flags;
|
|
int error;
|
|
int count;
|
|
|
|
again:
|
|
error = fueword32(&m->m_owner, &owner);
|
|
if (error == -1)
|
|
return (EFAULT);
|
|
|
|
if ((owner & ~UMUTEX_CONTESTED) != 0 && owner != UMUTEX_RB_OWNERDEAD &&
|
|
owner != UMUTEX_RB_NOTRECOV)
|
|
return (0);
|
|
|
|
error = fueword32(&m->m_flags, &flags);
|
|
if (error == -1)
|
|
return (EFAULT);
|
|
|
|
/* We should only ever be in here for contested locks */
|
|
if ((error = umtx_key_get(m, TYPE_NORMAL_UMUTEX, GET_SHARE(flags),
|
|
&key)) != 0)
|
|
return (error);
|
|
|
|
umtxq_lock(&key);
|
|
umtxq_busy(&key);
|
|
count = umtxq_count(&key);
|
|
umtxq_unlock(&key);
|
|
|
|
if (count <= 1 && owner != UMUTEX_RB_OWNERDEAD &&
|
|
owner != UMUTEX_RB_NOTRECOV) {
|
|
error = casueword32(&m->m_owner, UMUTEX_CONTESTED, &owner,
|
|
UMUTEX_UNOWNED);
|
|
if (error == -1) {
|
|
error = EFAULT;
|
|
} else if (error == 1) {
|
|
umtxq_lock(&key);
|
|
umtxq_unbusy(&key);
|
|
umtxq_unlock(&key);
|
|
umtx_key_release(&key);
|
|
error = thread_check_susp(td, false);
|
|
if (error != 0)
|
|
return (error);
|
|
goto again;
|
|
}
|
|
}
|
|
|
|
umtxq_lock(&key);
|
|
if (error == 0 && count != 0) {
|
|
MPASS((owner & ~UMUTEX_CONTESTED) == 0 ||
|
|
owner == UMUTEX_RB_OWNERDEAD ||
|
|
owner == UMUTEX_RB_NOTRECOV);
|
|
umtxq_signal(&key, 1);
|
|
}
|
|
umtxq_unbusy(&key);
|
|
umtxq_unlock(&key);
|
|
umtx_key_release(&key);
|
|
return (error);
|
|
}
|
|
|
|
/*
|
|
* Check if the mutex has waiters and tries to fix contention bit.
|
|
*/
|
|
static int
|
|
do_wake2_umutex(struct thread *td, struct umutex *m, uint32_t flags)
|
|
{
|
|
struct umtx_key key;
|
|
uint32_t owner, old;
|
|
int type;
|
|
int error;
|
|
int count;
|
|
|
|
switch (flags & (UMUTEX_PRIO_INHERIT | UMUTEX_PRIO_PROTECT |
|
|
UMUTEX_ROBUST)) {
|
|
case 0:
|
|
case UMUTEX_ROBUST:
|
|
type = TYPE_NORMAL_UMUTEX;
|
|
break;
|
|
case UMUTEX_PRIO_INHERIT:
|
|
type = TYPE_PI_UMUTEX;
|
|
break;
|
|
case (UMUTEX_PRIO_INHERIT | UMUTEX_ROBUST):
|
|
type = TYPE_PI_ROBUST_UMUTEX;
|
|
break;
|
|
case UMUTEX_PRIO_PROTECT:
|
|
type = TYPE_PP_UMUTEX;
|
|
break;
|
|
case (UMUTEX_PRIO_PROTECT | UMUTEX_ROBUST):
|
|
type = TYPE_PP_ROBUST_UMUTEX;
|
|
break;
|
|
default:
|
|
return (EINVAL);
|
|
}
|
|
if ((error = umtx_key_get(m, type, GET_SHARE(flags), &key)) != 0)
|
|
return (error);
|
|
|
|
owner = 0;
|
|
umtxq_lock(&key);
|
|
umtxq_busy(&key);
|
|
count = umtxq_count(&key);
|
|
umtxq_unlock(&key);
|
|
|
|
error = fueword32(&m->m_owner, &owner);
|
|
if (error == -1)
|
|
error = EFAULT;
|
|
|
|
/*
|
|
* Only repair contention bit if there is a waiter, this means
|
|
* the mutex is still being referenced by userland code,
|
|
* otherwise don't update any memory.
|
|
*/
|
|
while (error == 0 && (owner & UMUTEX_CONTESTED) == 0 &&
|
|
(count > 1 || (count == 1 && (owner & ~UMUTEX_CONTESTED) != 0))) {
|
|
error = casueword32(&m->m_owner, owner, &old,
|
|
owner | UMUTEX_CONTESTED);
|
|
if (error == -1) {
|
|
error = EFAULT;
|
|
break;
|
|
}
|
|
if (error == 0) {
|
|
MPASS(old == owner);
|
|
break;
|
|
}
|
|
owner = old;
|
|
error = thread_check_susp(td, false);
|
|
}
|
|
|
|
umtxq_lock(&key);
|
|
if (error == EFAULT) {
|
|
umtxq_signal(&key, INT_MAX);
|
|
} else if (count != 0 && ((owner & ~UMUTEX_CONTESTED) == 0 ||
|
|
owner == UMUTEX_RB_OWNERDEAD || owner == UMUTEX_RB_NOTRECOV))
|
|
umtxq_signal(&key, 1);
|
|
umtxq_unbusy(&key);
|
|
umtxq_unlock(&key);
|
|
umtx_key_release(&key);
|
|
return (error);
|
|
}
|
|
|
|
struct umtx_pi *
|
|
umtx_pi_alloc(int flags)
|
|
{
|
|
struct umtx_pi *pi;
|
|
|
|
pi = uma_zalloc(umtx_pi_zone, M_ZERO | flags);
|
|
TAILQ_INIT(&pi->pi_blocked);
|
|
atomic_add_int(&umtx_pi_allocated, 1);
|
|
return (pi);
|
|
}
|
|
|
|
void
|
|
umtx_pi_free(struct umtx_pi *pi)
|
|
{
|
|
uma_zfree(umtx_pi_zone, pi);
|
|
atomic_add_int(&umtx_pi_allocated, -1);
|
|
}
|
|
|
|
/*
|
|
* Adjust the thread's position on a pi_state after its priority has been
|
|
* changed.
|
|
*/
|
|
static int
|
|
umtx_pi_adjust_thread(struct umtx_pi *pi, struct thread *td)
|
|
{
|
|
struct umtx_q *uq, *uq1, *uq2;
|
|
struct thread *td1;
|
|
|
|
mtx_assert(&umtx_lock, MA_OWNED);
|
|
if (pi == NULL)
|
|
return (0);
|
|
|
|
uq = td->td_umtxq;
|
|
|
|
/*
|
|
* Check if the thread needs to be moved on the blocked chain.
|
|
* It needs to be moved if either its priority is lower than
|
|
* the previous thread or higher than the next thread.
|
|
*/
|
|
uq1 = TAILQ_PREV(uq, umtxq_head, uq_lockq);
|
|
uq2 = TAILQ_NEXT(uq, uq_lockq);
|
|
if ((uq1 != NULL && UPRI(td) < UPRI(uq1->uq_thread)) ||
|
|
(uq2 != NULL && UPRI(td) > UPRI(uq2->uq_thread))) {
|
|
/*
|
|
* Remove thread from blocked chain and determine where
|
|
* it should be moved to.
|
|
*/
|
|
TAILQ_REMOVE(&pi->pi_blocked, uq, uq_lockq);
|
|
TAILQ_FOREACH(uq1, &pi->pi_blocked, uq_lockq) {
|
|
td1 = uq1->uq_thread;
|
|
MPASS(td1->td_proc->p_magic == P_MAGIC);
|
|
if (UPRI(td1) > UPRI(td))
|
|
break;
|
|
}
|
|
|
|
if (uq1 == NULL)
|
|
TAILQ_INSERT_TAIL(&pi->pi_blocked, uq, uq_lockq);
|
|
else
|
|
TAILQ_INSERT_BEFORE(uq1, uq, uq_lockq);
|
|
}
|
|
return (1);
|
|
}
|
|
|
|
static struct umtx_pi *
|
|
umtx_pi_next(struct umtx_pi *pi)
|
|
{
|
|
struct umtx_q *uq_owner;
|
|
|
|
if (pi->pi_owner == NULL)
|
|
return (NULL);
|
|
uq_owner = pi->pi_owner->td_umtxq;
|
|
if (uq_owner == NULL)
|
|
return (NULL);
|
|
return (uq_owner->uq_pi_blocked);
|
|
}
|
|
|
|
/*
|
|
* Floyd's Cycle-Finding Algorithm.
|
|
*/
|
|
static bool
|
|
umtx_pi_check_loop(struct umtx_pi *pi)
|
|
{
|
|
struct umtx_pi *pi1; /* fast iterator */
|
|
|
|
mtx_assert(&umtx_lock, MA_OWNED);
|
|
if (pi == NULL)
|
|
return (false);
|
|
pi1 = pi;
|
|
for (;;) {
|
|
pi = umtx_pi_next(pi);
|
|
if (pi == NULL)
|
|
break;
|
|
pi1 = umtx_pi_next(pi1);
|
|
if (pi1 == NULL)
|
|
break;
|
|
pi1 = umtx_pi_next(pi1);
|
|
if (pi1 == NULL)
|
|
break;
|
|
if (pi == pi1)
|
|
return (true);
|
|
}
|
|
return (false);
|
|
}
|
|
|
|
/*
|
|
* Propagate priority when a thread is blocked on POSIX
|
|
* PI mutex.
|
|
*/
|
|
static void
|
|
umtx_propagate_priority(struct thread *td)
|
|
{
|
|
struct umtx_q *uq;
|
|
struct umtx_pi *pi;
|
|
int pri;
|
|
|
|
mtx_assert(&umtx_lock, MA_OWNED);
|
|
pri = UPRI(td);
|
|
uq = td->td_umtxq;
|
|
pi = uq->uq_pi_blocked;
|
|
if (pi == NULL)
|
|
return;
|
|
if (umtx_pi_check_loop(pi))
|
|
return;
|
|
|
|
for (;;) {
|
|
td = pi->pi_owner;
|
|
if (td == NULL || td == curthread)
|
|
return;
|
|
|
|
MPASS(td->td_proc != NULL);
|
|
MPASS(td->td_proc->p_magic == P_MAGIC);
|
|
|
|
thread_lock(td);
|
|
if (td->td_lend_user_pri > pri)
|
|
sched_lend_user_prio(td, pri);
|
|
else {
|
|
thread_unlock(td);
|
|
break;
|
|
}
|
|
thread_unlock(td);
|
|
|
|
/*
|
|
* Pick up the lock that td is blocked on.
|
|
*/
|
|
uq = td->td_umtxq;
|
|
pi = uq->uq_pi_blocked;
|
|
if (pi == NULL)
|
|
break;
|
|
/* Resort td on the list if needed. */
|
|
umtx_pi_adjust_thread(pi, td);
|
|
}
|
|
}
|
|
|
|
/*
|
|
* Unpropagate priority for a PI mutex when a thread blocked on
|
|
* it is interrupted by signal or resumed by others.
|
|
*/
|
|
static void
|
|
umtx_repropagate_priority(struct umtx_pi *pi)
|
|
{
|
|
struct umtx_q *uq, *uq_owner;
|
|
struct umtx_pi *pi2;
|
|
int pri;
|
|
|
|
mtx_assert(&umtx_lock, MA_OWNED);
|
|
|
|
if (umtx_pi_check_loop(pi))
|
|
return;
|
|
while (pi != NULL && pi->pi_owner != NULL) {
|
|
pri = PRI_MAX;
|
|
uq_owner = pi->pi_owner->td_umtxq;
|
|
|
|
TAILQ_FOREACH(pi2, &uq_owner->uq_pi_contested, pi_link) {
|
|
uq = TAILQ_FIRST(&pi2->pi_blocked);
|
|
if (uq != NULL) {
|
|
if (pri > UPRI(uq->uq_thread))
|
|
pri = UPRI(uq->uq_thread);
|
|
}
|
|
}
|
|
|
|
if (pri > uq_owner->uq_inherited_pri)
|
|
pri = uq_owner->uq_inherited_pri;
|
|
thread_lock(pi->pi_owner);
|
|
sched_lend_user_prio(pi->pi_owner, pri);
|
|
thread_unlock(pi->pi_owner);
|
|
if ((pi = uq_owner->uq_pi_blocked) != NULL)
|
|
umtx_pi_adjust_thread(pi, uq_owner->uq_thread);
|
|
}
|
|
}
|
|
|
|
/*
|
|
* Insert a PI mutex into owned list.
|
|
*/
|
|
static void
|
|
umtx_pi_setowner(struct umtx_pi *pi, struct thread *owner)
|
|
{
|
|
struct umtx_q *uq_owner;
|
|
|
|
uq_owner = owner->td_umtxq;
|
|
mtx_assert(&umtx_lock, MA_OWNED);
|
|
MPASS(pi->pi_owner == NULL);
|
|
pi->pi_owner = owner;
|
|
TAILQ_INSERT_TAIL(&uq_owner->uq_pi_contested, pi, pi_link);
|
|
}
|
|
|
|
/*
|
|
* Disown a PI mutex, and remove it from the owned list.
|
|
*/
|
|
static void
|
|
umtx_pi_disown(struct umtx_pi *pi)
|
|
{
|
|
|
|
mtx_assert(&umtx_lock, MA_OWNED);
|
|
TAILQ_REMOVE(&pi->pi_owner->td_umtxq->uq_pi_contested, pi, pi_link);
|
|
pi->pi_owner = NULL;
|
|
}
|
|
|
|
/*
|
|
* Claim ownership of a PI mutex.
|
|
*/
|
|
int
|
|
umtx_pi_claim(struct umtx_pi *pi, struct thread *owner)
|
|
{
|
|
struct umtx_q *uq;
|
|
int pri;
|
|
|
|
mtx_lock(&umtx_lock);
|
|
if (pi->pi_owner == owner) {
|
|
mtx_unlock(&umtx_lock);
|
|
return (0);
|
|
}
|
|
|
|
if (pi->pi_owner != NULL) {
|
|
/*
|
|
* userland may have already messed the mutex, sigh.
|
|
*/
|
|
mtx_unlock(&umtx_lock);
|
|
return (EPERM);
|
|
}
|
|
umtx_pi_setowner(pi, owner);
|
|
uq = TAILQ_FIRST(&pi->pi_blocked);
|
|
if (uq != NULL) {
|
|
pri = UPRI(uq->uq_thread);
|
|
thread_lock(owner);
|
|
if (pri < UPRI(owner))
|
|
sched_lend_user_prio(owner, pri);
|
|
thread_unlock(owner);
|
|
}
|
|
mtx_unlock(&umtx_lock);
|
|
return (0);
|
|
}
|
|
|
|
/*
|
|
* Adjust a thread's order position in its blocked PI mutex,
|
|
* this may result new priority propagating process.
|
|
*/
|
|
void
|
|
umtx_pi_adjust(struct thread *td, u_char oldpri)
|
|
{
|
|
struct umtx_q *uq;
|
|
struct umtx_pi *pi;
|
|
|
|
uq = td->td_umtxq;
|
|
mtx_lock(&umtx_lock);
|
|
/*
|
|
* Pick up the lock that td is blocked on.
|
|
*/
|
|
pi = uq->uq_pi_blocked;
|
|
if (pi != NULL) {
|
|
umtx_pi_adjust_thread(pi, td);
|
|
umtx_repropagate_priority(pi);
|
|
}
|
|
mtx_unlock(&umtx_lock);
|
|
}
|
|
|
|
/*
|
|
* Sleep on a PI mutex.
|
|
*/
|
|
int
|
|
umtxq_sleep_pi(struct umtx_q *uq, struct umtx_pi *pi, uint32_t owner,
|
|
const char *wmesg, struct umtx_abs_timeout *timo, bool shared)
|
|
{
|
|
struct thread *td, *td1;
|
|
struct umtx_q *uq1;
|
|
int error, pri;
|
|
#ifdef INVARIANTS
|
|
struct umtxq_chain *uc;
|
|
|
|
uc = umtxq_getchain(&pi->pi_key);
|
|
#endif
|
|
error = 0;
|
|
td = uq->uq_thread;
|
|
KASSERT(td == curthread, ("inconsistent uq_thread"));
|
|
UMTXQ_LOCKED_ASSERT(umtxq_getchain(&uq->uq_key));
|
|
KASSERT(uc->uc_busy != 0, ("umtx chain is not busy"));
|
|
umtxq_insert(uq);
|
|
mtx_lock(&umtx_lock);
|
|
if (pi->pi_owner == NULL) {
|
|
mtx_unlock(&umtx_lock);
|
|
td1 = tdfind(owner, shared ? -1 : td->td_proc->p_pid);
|
|
mtx_lock(&umtx_lock);
|
|
if (td1 != NULL) {
|
|
if (pi->pi_owner == NULL)
|
|
umtx_pi_setowner(pi, td1);
|
|
PROC_UNLOCK(td1->td_proc);
|
|
}
|
|
}
|
|
|
|
TAILQ_FOREACH(uq1, &pi->pi_blocked, uq_lockq) {
|
|
pri = UPRI(uq1->uq_thread);
|
|
if (pri > UPRI(td))
|
|
break;
|
|
}
|
|
|
|
if (uq1 != NULL)
|
|
TAILQ_INSERT_BEFORE(uq1, uq, uq_lockq);
|
|
else
|
|
TAILQ_INSERT_TAIL(&pi->pi_blocked, uq, uq_lockq);
|
|
|
|
uq->uq_pi_blocked = pi;
|
|
thread_lock(td);
|
|
td->td_flags |= TDF_UPIBLOCKED;
|
|
thread_unlock(td);
|
|
umtx_propagate_priority(td);
|
|
mtx_unlock(&umtx_lock);
|
|
umtxq_unbusy(&uq->uq_key);
|
|
|
|
error = umtxq_sleep(uq, wmesg, timo);
|
|
umtxq_remove(uq);
|
|
|
|
mtx_lock(&umtx_lock);
|
|
uq->uq_pi_blocked = NULL;
|
|
thread_lock(td);
|
|
td->td_flags &= ~TDF_UPIBLOCKED;
|
|
thread_unlock(td);
|
|
TAILQ_REMOVE(&pi->pi_blocked, uq, uq_lockq);
|
|
umtx_repropagate_priority(pi);
|
|
mtx_unlock(&umtx_lock);
|
|
umtxq_unlock(&uq->uq_key);
|
|
|
|
return (error);
|
|
}
|
|
|
|
/*
|
|
* Add reference count for a PI mutex.
|
|
*/
|
|
void
|
|
umtx_pi_ref(struct umtx_pi *pi)
|
|
{
|
|
|
|
UMTXQ_LOCKED_ASSERT(umtxq_getchain(&pi->pi_key));
|
|
pi->pi_refcount++;
|
|
}
|
|
|
|
/*
|
|
* Decrease reference count for a PI mutex, if the counter
|
|
* is decreased to zero, its memory space is freed.
|
|
*/
|
|
void
|
|
umtx_pi_unref(struct umtx_pi *pi)
|
|
{
|
|
struct umtxq_chain *uc;
|
|
|
|
uc = umtxq_getchain(&pi->pi_key);
|
|
UMTXQ_LOCKED_ASSERT(uc);
|
|
KASSERT(pi->pi_refcount > 0, ("invalid reference count"));
|
|
if (--pi->pi_refcount == 0) {
|
|
mtx_lock(&umtx_lock);
|
|
if (pi->pi_owner != NULL)
|
|
umtx_pi_disown(pi);
|
|
KASSERT(TAILQ_EMPTY(&pi->pi_blocked),
|
|
("blocked queue not empty"));
|
|
mtx_unlock(&umtx_lock);
|
|
TAILQ_REMOVE(&uc->uc_pi_list, pi, pi_hashlink);
|
|
umtx_pi_free(pi);
|
|
}
|
|
}
|
|
|
|
/*
|
|
* Find a PI mutex in hash table.
|
|
*/
|
|
struct umtx_pi *
|
|
umtx_pi_lookup(struct umtx_key *key)
|
|
{
|
|
struct umtxq_chain *uc;
|
|
struct umtx_pi *pi;
|
|
|
|
uc = umtxq_getchain(key);
|
|
UMTXQ_LOCKED_ASSERT(uc);
|
|
|
|
TAILQ_FOREACH(pi, &uc->uc_pi_list, pi_hashlink) {
|
|
if (umtx_key_match(&pi->pi_key, key)) {
|
|
return (pi);
|
|
}
|
|
}
|
|
return (NULL);
|
|
}
|
|
|
|
/*
|
|
* Insert a PI mutex into hash table.
|
|
*/
|
|
void
|
|
umtx_pi_insert(struct umtx_pi *pi)
|
|
{
|
|
struct umtxq_chain *uc;
|
|
|
|
uc = umtxq_getchain(&pi->pi_key);
|
|
UMTXQ_LOCKED_ASSERT(uc);
|
|
TAILQ_INSERT_TAIL(&uc->uc_pi_list, pi, pi_hashlink);
|
|
}
|
|
|
|
/*
|
|
* Drop a PI mutex and wakeup a top waiter.
|
|
*/
|
|
int
|
|
umtx_pi_drop(struct thread *td, struct umtx_key *key, bool rb, int *count)
|
|
{
|
|
struct umtx_q *uq_first, *uq_first2, *uq_me;
|
|
struct umtx_pi *pi, *pi2;
|
|
int pri;
|
|
|
|
UMTXQ_ASSERT_LOCKED_BUSY(key);
|
|
*count = umtxq_count_pi(key, &uq_first);
|
|
if (uq_first != NULL) {
|
|
mtx_lock(&umtx_lock);
|
|
pi = uq_first->uq_pi_blocked;
|
|
KASSERT(pi != NULL, ("pi == NULL?"));
|
|
if (pi->pi_owner != td && !(rb && pi->pi_owner == NULL)) {
|
|
mtx_unlock(&umtx_lock);
|
|
/* userland messed the mutex */
|
|
return (EPERM);
|
|
}
|
|
uq_me = td->td_umtxq;
|
|
if (pi->pi_owner == td)
|
|
umtx_pi_disown(pi);
|
|
/* get highest priority thread which is still sleeping. */
|
|
uq_first = TAILQ_FIRST(&pi->pi_blocked);
|
|
while (uq_first != NULL &&
|
|
(uq_first->uq_flags & UQF_UMTXQ) == 0) {
|
|
uq_first = TAILQ_NEXT(uq_first, uq_lockq);
|
|
}
|
|
pri = PRI_MAX;
|
|
TAILQ_FOREACH(pi2, &uq_me->uq_pi_contested, pi_link) {
|
|
uq_first2 = TAILQ_FIRST(&pi2->pi_blocked);
|
|
if (uq_first2 != NULL) {
|
|
if (pri > UPRI(uq_first2->uq_thread))
|
|
pri = UPRI(uq_first2->uq_thread);
|
|
}
|
|
}
|
|
thread_lock(td);
|
|
sched_lend_user_prio(td, pri);
|
|
thread_unlock(td);
|
|
mtx_unlock(&umtx_lock);
|
|
if (uq_first)
|
|
umtxq_signal_thread(uq_first);
|
|
} else {
|
|
pi = umtx_pi_lookup(key);
|
|
/*
|
|
* A umtx_pi can exist if a signal or timeout removed the
|
|
* last waiter from the umtxq, but there is still
|
|
* a thread in do_lock_pi() holding the umtx_pi.
|
|
*/
|
|
if (pi != NULL) {
|
|
/*
|
|
* The umtx_pi can be unowned, such as when a thread
|
|
* has just entered do_lock_pi(), allocated the
|
|
* umtx_pi, and unlocked the umtxq.
|
|
* If the current thread owns it, it must disown it.
|
|
*/
|
|
mtx_lock(&umtx_lock);
|
|
if (pi->pi_owner == td)
|
|
umtx_pi_disown(pi);
|
|
mtx_unlock(&umtx_lock);
|
|
}
|
|
}
|
|
return (0);
|
|
}
|
|
|
|
/*
|
|
* Lock a PI mutex.
|
|
*/
|
|
static int
|
|
do_lock_pi(struct thread *td, struct umutex *m, uint32_t flags,
|
|
struct _umtx_time *timeout, int try)
|
|
{
|
|
struct umtx_abs_timeout timo;
|
|
struct umtx_q *uq;
|
|
struct umtx_pi *pi, *new_pi;
|
|
uint32_t id, old_owner, owner, old;
|
|
int error, rv;
|
|
|
|
id = td->td_tid;
|
|
uq = td->td_umtxq;
|
|
|
|
if ((error = umtx_key_get(m, (flags & UMUTEX_ROBUST) != 0 ?
|
|
TYPE_PI_ROBUST_UMUTEX : TYPE_PI_UMUTEX, GET_SHARE(flags),
|
|
&uq->uq_key)) != 0)
|
|
return (error);
|
|
|
|
if (timeout != NULL)
|
|
umtx_abs_timeout_init2(&timo, timeout);
|
|
|
|
umtxq_lock(&uq->uq_key);
|
|
pi = umtx_pi_lookup(&uq->uq_key);
|
|
if (pi == NULL) {
|
|
new_pi = umtx_pi_alloc(M_NOWAIT);
|
|
if (new_pi == NULL) {
|
|
umtxq_unlock(&uq->uq_key);
|
|
new_pi = umtx_pi_alloc(M_WAITOK);
|
|
umtxq_lock(&uq->uq_key);
|
|
pi = umtx_pi_lookup(&uq->uq_key);
|
|
if (pi != NULL) {
|
|
umtx_pi_free(new_pi);
|
|
new_pi = NULL;
|
|
}
|
|
}
|
|
if (new_pi != NULL) {
|
|
new_pi->pi_key = uq->uq_key;
|
|
umtx_pi_insert(new_pi);
|
|
pi = new_pi;
|
|
}
|
|
}
|
|
umtx_pi_ref(pi);
|
|
umtxq_unlock(&uq->uq_key);
|
|
|
|
/*
|
|
* Care must be exercised when dealing with umtx structure. It
|
|
* can fault on any access.
|
|
*/
|
|
for (;;) {
|
|
/*
|
|
* Try the uncontested case. This should be done in userland.
|
|
*/
|
|
rv = casueword32(&m->m_owner, UMUTEX_UNOWNED, &owner, id);
|
|
/* The address was invalid. */
|
|
if (rv == -1) {
|
|
error = EFAULT;
|
|
break;
|
|
}
|
|
/* The acquire succeeded. */
|
|
if (rv == 0) {
|
|
MPASS(owner == UMUTEX_UNOWNED);
|
|
error = 0;
|
|
break;
|
|
}
|
|
|
|
if (owner == UMUTEX_RB_NOTRECOV) {
|
|
error = ENOTRECOVERABLE;
|
|
break;
|
|
}
|
|
|
|
/*
|
|
* Nobody owns it, but the acquire failed. This can happen
|
|
* with ll/sc atomics.
|
|
*/
|
|
if (owner == UMUTEX_UNOWNED) {
|
|
error = thread_check_susp(td, true);
|
|
if (error != 0)
|
|
break;
|
|
continue;
|
|
}
|
|
|
|
/*
|
|
* Avoid overwriting a possible error from sleep due
|
|
* to the pending signal with suspension check result.
|
|
*/
|
|
if (error == 0) {
|
|
error = thread_check_susp(td, true);
|
|
if (error != 0)
|
|
break;
|
|
}
|
|
|
|
/* If no one owns it but it is contested try to acquire it. */
|
|
if (owner == UMUTEX_CONTESTED || owner == UMUTEX_RB_OWNERDEAD) {
|
|
old_owner = owner;
|
|
rv = casueword32(&m->m_owner, owner, &owner,
|
|
id | UMUTEX_CONTESTED);
|
|
/* The address was invalid. */
|
|
if (rv == -1) {
|
|
error = EFAULT;
|
|
break;
|
|
}
|
|
if (rv == 1) {
|
|
if (error == 0) {
|
|
error = thread_check_susp(td, true);
|
|
if (error != 0)
|
|
break;
|
|
}
|
|
|
|
/*
|
|
* If this failed the lock could
|
|
* changed, restart.
|
|
*/
|
|
continue;
|
|
}
|
|
|
|
MPASS(rv == 0);
|
|
MPASS(owner == old_owner);
|
|
umtxq_lock(&uq->uq_key);
|
|
umtxq_busy(&uq->uq_key);
|
|
error = umtx_pi_claim(pi, td);
|
|
umtxq_unbusy(&uq->uq_key);
|
|
umtxq_unlock(&uq->uq_key);
|
|
if (error != 0) {
|
|
/*
|
|
* Since we're going to return an
|
|
* error, restore the m_owner to its
|
|
* previous, unowned state to avoid
|
|
* compounding the problem.
|
|
*/
|
|
(void)casuword32(&m->m_owner,
|
|
id | UMUTEX_CONTESTED, old_owner);
|
|
}
|
|
if (error == 0 && old_owner == UMUTEX_RB_OWNERDEAD)
|
|
error = EOWNERDEAD;
|
|
break;
|
|
}
|
|
|
|
if ((owner & ~UMUTEX_CONTESTED) == id) {
|
|
error = EDEADLK;
|
|
break;
|
|
}
|
|
|
|
if (try != 0) {
|
|
error = EBUSY;
|
|
break;
|
|
}
|
|
|
|
/*
|
|
* If we caught a signal, we have retried and now
|
|
* exit immediately.
|
|
*/
|
|
if (error != 0)
|
|
break;
|
|
|
|
umtxq_lock(&uq->uq_key);
|
|
umtxq_busy(&uq->uq_key);
|
|
umtxq_unlock(&uq->uq_key);
|
|
|
|
/*
|
|
* Set the contested bit so that a release in user space
|
|
* knows to use the system call for unlock. If this fails
|
|
* either some one else has acquired the lock or it has been
|
|
* released.
|
|
*/
|
|
rv = casueword32(&m->m_owner, owner, &old, owner |
|
|
UMUTEX_CONTESTED);
|
|
|
|
/* The address was invalid. */
|
|
if (rv == -1) {
|
|
umtxq_unbusy_unlocked(&uq->uq_key);
|
|
error = EFAULT;
|
|
break;
|
|
}
|
|
if (rv == 1) {
|
|
umtxq_unbusy_unlocked(&uq->uq_key);
|
|
error = thread_check_susp(td, true);
|
|
if (error != 0)
|
|
break;
|
|
|
|
/*
|
|
* The lock changed and we need to retry or we
|
|
* lost a race to the thread unlocking the
|
|
* umtx. Note that the UMUTEX_RB_OWNERDEAD
|
|
* value for owner is impossible there.
|
|
*/
|
|
continue;
|
|
}
|
|
|
|
umtxq_lock(&uq->uq_key);
|
|
|
|
/* We set the contested bit, sleep. */
|
|
MPASS(old == owner);
|
|
error = umtxq_sleep_pi(uq, pi, owner & ~UMUTEX_CONTESTED,
|
|
"umtxpi", timeout == NULL ? NULL : &timo,
|
|
(flags & USYNC_PROCESS_SHARED) != 0);
|
|
if (error != 0)
|
|
continue;
|
|
|
|
error = thread_check_susp(td, false);
|
|
if (error != 0)
|
|
break;
|
|
}
|
|
|
|
umtxq_lock(&uq->uq_key);
|
|
umtx_pi_unref(pi);
|
|
umtxq_unlock(&uq->uq_key);
|
|
|
|
umtx_key_release(&uq->uq_key);
|
|
return (error);
|
|
}
|
|
|
|
/*
|
|
* Unlock a PI mutex.
|
|
*/
|
|
static int
|
|
do_unlock_pi(struct thread *td, struct umutex *m, uint32_t flags, bool rb)
|
|
{
|
|
struct umtx_key key;
|
|
uint32_t id, new_owner, old, owner;
|
|
int count, error;
|
|
|
|
id = td->td_tid;
|
|
|
|
usrloop:
|
|
/*
|
|
* Make sure we own this mtx.
|
|
*/
|
|
error = fueword32(&m->m_owner, &owner);
|
|
if (error == -1)
|
|
return (EFAULT);
|
|
|
|
if ((owner & ~UMUTEX_CONTESTED) != id)
|
|
return (EPERM);
|
|
|
|
new_owner = umtx_unlock_val(flags, rb);
|
|
|
|
/* This should be done in userland */
|
|
if ((owner & UMUTEX_CONTESTED) == 0) {
|
|
error = casueword32(&m->m_owner, owner, &old, new_owner);
|
|
if (error == -1)
|
|
return (EFAULT);
|
|
if (error == 1) {
|
|
error = thread_check_susp(td, true);
|
|
if (error != 0)
|
|
return (error);
|
|
goto usrloop;
|
|
}
|
|
if (old == owner)
|
|
return (0);
|
|
owner = old;
|
|
}
|
|
|
|
/* We should only ever be in here for contested locks */
|
|
if ((error = umtx_key_get(m, (flags & UMUTEX_ROBUST) != 0 ?
|
|
TYPE_PI_ROBUST_UMUTEX : TYPE_PI_UMUTEX, GET_SHARE(flags),
|
|
&key)) != 0)
|
|
return (error);
|
|
|
|
umtxq_lock(&key);
|
|
umtxq_busy(&key);
|
|
error = umtx_pi_drop(td, &key, rb, &count);
|
|
if (error != 0) {
|
|
umtxq_unbusy(&key);
|
|
umtxq_unlock(&key);
|
|
umtx_key_release(&key);
|
|
/* userland messed the mutex */
|
|
return (error);
|
|
}
|
|
umtxq_unlock(&key);
|
|
|
|
/*
|
|
* When unlocking the umtx, it must be marked as unowned if
|
|
* there is zero or one thread only waiting for it.
|
|
* Otherwise, it must be marked as contested.
|
|
*/
|
|
|
|
if (count > 1)
|
|
new_owner |= UMUTEX_CONTESTED;
|
|
again:
|
|
error = casueword32(&m->m_owner, owner, &old, new_owner);
|
|
if (error == 1) {
|
|
error = thread_check_susp(td, false);
|
|
if (error == 0)
|
|
goto again;
|
|
}
|
|
umtxq_unbusy_unlocked(&key);
|
|
umtx_key_release(&key);
|
|
if (error == -1)
|
|
return (EFAULT);
|
|
if (error == 0 && old != owner)
|
|
return (EINVAL);
|
|
return (error);
|
|
}
|
|
|
|
/*
|
|
* Lock a PP mutex.
|
|
*/
|
|
static int
|
|
do_lock_pp(struct thread *td, struct umutex *m, uint32_t flags,
|
|
struct _umtx_time *timeout, int try)
|
|
{
|
|
struct umtx_abs_timeout timo;
|
|
struct umtx_q *uq, *uq2;
|
|
struct umtx_pi *pi;
|
|
uint32_t ceiling;
|
|
uint32_t owner, id;
|
|
int error, pri, old_inherited_pri, su, rv;
|
|
|
|
id = td->td_tid;
|
|
uq = td->td_umtxq;
|
|
if ((error = umtx_key_get(m, (flags & UMUTEX_ROBUST) != 0 ?
|
|
TYPE_PP_ROBUST_UMUTEX : TYPE_PP_UMUTEX, GET_SHARE(flags),
|
|
&uq->uq_key)) != 0)
|
|
return (error);
|
|
|
|
if (timeout != NULL)
|
|
umtx_abs_timeout_init2(&timo, timeout);
|
|
|
|
su = (priv_check(td, PRIV_SCHED_RTPRIO) == 0);
|
|
for (;;) {
|
|
old_inherited_pri = uq->uq_inherited_pri;
|
|
umtxq_lock(&uq->uq_key);
|
|
umtxq_busy(&uq->uq_key);
|
|
umtxq_unlock(&uq->uq_key);
|
|
|
|
rv = fueword32(&m->m_ceilings[0], &ceiling);
|
|
if (rv == -1) {
|
|
error = EFAULT;
|
|
goto out;
|
|
}
|
|
ceiling = RTP_PRIO_MAX - ceiling;
|
|
if (ceiling > RTP_PRIO_MAX) {
|
|
error = EINVAL;
|
|
goto out;
|
|
}
|
|
|
|
mtx_lock(&umtx_lock);
|
|
if (UPRI(td) < PRI_MIN_REALTIME + ceiling) {
|
|
mtx_unlock(&umtx_lock);
|
|
error = EINVAL;
|
|
goto out;
|
|
}
|
|
if (su && PRI_MIN_REALTIME + ceiling < uq->uq_inherited_pri) {
|
|
uq->uq_inherited_pri = PRI_MIN_REALTIME + ceiling;
|
|
thread_lock(td);
|
|
if (uq->uq_inherited_pri < UPRI(td))
|
|
sched_lend_user_prio(td, uq->uq_inherited_pri);
|
|
thread_unlock(td);
|
|
}
|
|
mtx_unlock(&umtx_lock);
|
|
|
|
rv = casueword32(&m->m_owner, UMUTEX_CONTESTED, &owner,
|
|
id | UMUTEX_CONTESTED);
|
|
/* The address was invalid. */
|
|
if (rv == -1) {
|
|
error = EFAULT;
|
|
break;
|
|
}
|
|
if (rv == 0) {
|
|
MPASS(owner == UMUTEX_CONTESTED);
|
|
error = 0;
|
|
break;
|
|
}
|
|
/* rv == 1 */
|
|
if (owner == UMUTEX_RB_OWNERDEAD) {
|
|
rv = casueword32(&m->m_owner, UMUTEX_RB_OWNERDEAD,
|
|
&owner, id | UMUTEX_CONTESTED);
|
|
if (rv == -1) {
|
|
error = EFAULT;
|
|
break;
|
|
}
|
|
if (rv == 0) {
|
|
MPASS(owner == UMUTEX_RB_OWNERDEAD);
|
|
error = EOWNERDEAD; /* success */
|
|
break;
|
|
}
|
|
|
|
/*
|
|
* rv == 1, only check for suspension if we
|
|
* did not already catched a signal. If we
|
|
* get an error from the check, the same
|
|
* condition is checked by the umtxq_sleep()
|
|
* call below, so we should obliterate the
|
|
* error to not skip the last loop iteration.
|
|
*/
|
|
if (error == 0) {
|
|
error = thread_check_susp(td, false);
|
|
if (error == 0) {
|
|
if (try != 0)
|
|
error = EBUSY;
|
|
else
|
|
continue;
|
|
}
|
|
error = 0;
|
|
}
|
|
} else if (owner == UMUTEX_RB_NOTRECOV) {
|
|
error = ENOTRECOVERABLE;
|
|
}
|
|
|
|
if (try != 0)
|
|
error = EBUSY;
|
|
|
|
/*
|
|
* If we caught a signal, we have retried and now
|
|
* exit immediately.
|
|
*/
|
|
if (error != 0)
|
|
break;
|
|
|
|
umtxq_lock(&uq->uq_key);
|
|
umtxq_insert(uq);
|
|
umtxq_unbusy(&uq->uq_key);
|
|
error = umtxq_sleep(uq, "umtxpp", timeout == NULL ?
|
|
NULL : &timo);
|
|
umtxq_remove(uq);
|
|
umtxq_unlock(&uq->uq_key);
|
|
|
|
mtx_lock(&umtx_lock);
|
|
uq->uq_inherited_pri = old_inherited_pri;
|
|
pri = PRI_MAX;
|
|
TAILQ_FOREACH(pi, &uq->uq_pi_contested, pi_link) {
|
|
uq2 = TAILQ_FIRST(&pi->pi_blocked);
|
|
if (uq2 != NULL) {
|
|
if (pri > UPRI(uq2->uq_thread))
|
|
pri = UPRI(uq2->uq_thread);
|
|
}
|
|
}
|
|
if (pri > uq->uq_inherited_pri)
|
|
pri = uq->uq_inherited_pri;
|
|
thread_lock(td);
|
|
sched_lend_user_prio(td, pri);
|
|
thread_unlock(td);
|
|
mtx_unlock(&umtx_lock);
|
|
}
|
|
|
|
if (error != 0 && error != EOWNERDEAD) {
|
|
mtx_lock(&umtx_lock);
|
|
uq->uq_inherited_pri = old_inherited_pri;
|
|
pri = PRI_MAX;
|
|
TAILQ_FOREACH(pi, &uq->uq_pi_contested, pi_link) {
|
|
uq2 = TAILQ_FIRST(&pi->pi_blocked);
|
|
if (uq2 != NULL) {
|
|
if (pri > UPRI(uq2->uq_thread))
|
|
pri = UPRI(uq2->uq_thread);
|
|
}
|
|
}
|
|
if (pri > uq->uq_inherited_pri)
|
|
pri = uq->uq_inherited_pri;
|
|
thread_lock(td);
|
|
sched_lend_user_prio(td, pri);
|
|
thread_unlock(td);
|
|
mtx_unlock(&umtx_lock);
|
|
}
|
|
|
|
out:
|
|
umtxq_unbusy_unlocked(&uq->uq_key);
|
|
umtx_key_release(&uq->uq_key);
|
|
return (error);
|
|
}
|
|
|
|
/*
|
|
* Unlock a PP mutex.
|
|
*/
|
|
static int
|
|
do_unlock_pp(struct thread *td, struct umutex *m, uint32_t flags, bool rb)
|
|
{
|
|
struct umtx_key key;
|
|
struct umtx_q *uq, *uq2;
|
|
struct umtx_pi *pi;
|
|
uint32_t id, owner, rceiling;
|
|
int error, pri, new_inherited_pri, su;
|
|
|
|
id = td->td_tid;
|
|
uq = td->td_umtxq;
|
|
su = (priv_check(td, PRIV_SCHED_RTPRIO) == 0);
|
|
|
|
/*
|
|
* Make sure we own this mtx.
|
|
*/
|
|
error = fueword32(&m->m_owner, &owner);
|
|
if (error == -1)
|
|
return (EFAULT);
|
|
|
|
if ((owner & ~UMUTEX_CONTESTED) != id)
|
|
return (EPERM);
|
|
|
|
error = copyin(&m->m_ceilings[1], &rceiling, sizeof(uint32_t));
|
|
if (error != 0)
|
|
return (error);
|
|
|
|
if (rceiling == -1)
|
|
new_inherited_pri = PRI_MAX;
|
|
else {
|
|
rceiling = RTP_PRIO_MAX - rceiling;
|
|
if (rceiling > RTP_PRIO_MAX)
|
|
return (EINVAL);
|
|
new_inherited_pri = PRI_MIN_REALTIME + rceiling;
|
|
}
|
|
|
|
if ((error = umtx_key_get(m, (flags & UMUTEX_ROBUST) != 0 ?
|
|
TYPE_PP_ROBUST_UMUTEX : TYPE_PP_UMUTEX, GET_SHARE(flags),
|
|
&key)) != 0)
|
|
return (error);
|
|
umtxq_lock(&key);
|
|
umtxq_busy(&key);
|
|
umtxq_unlock(&key);
|
|
/*
|
|
* For priority protected mutex, always set unlocked state
|
|
* to UMUTEX_CONTESTED, so that userland always enters kernel
|
|
* to lock the mutex, it is necessary because thread priority
|
|
* has to be adjusted for such mutex.
|
|
*/
|
|
error = suword32(&m->m_owner, umtx_unlock_val(flags, rb) |
|
|
UMUTEX_CONTESTED);
|
|
|
|
umtxq_lock(&key);
|
|
if (error == 0)
|
|
umtxq_signal(&key, 1);
|
|
umtxq_unbusy(&key);
|
|
umtxq_unlock(&key);
|
|
|
|
if (error == -1)
|
|
error = EFAULT;
|
|
else {
|
|
mtx_lock(&umtx_lock);
|
|
if (su != 0)
|
|
uq->uq_inherited_pri = new_inherited_pri;
|
|
pri = PRI_MAX;
|
|
TAILQ_FOREACH(pi, &uq->uq_pi_contested, pi_link) {
|
|
uq2 = TAILQ_FIRST(&pi->pi_blocked);
|
|
if (uq2 != NULL) {
|
|
if (pri > UPRI(uq2->uq_thread))
|
|
pri = UPRI(uq2->uq_thread);
|
|
}
|
|
}
|
|
if (pri > uq->uq_inherited_pri)
|
|
pri = uq->uq_inherited_pri;
|
|
thread_lock(td);
|
|
sched_lend_user_prio(td, pri);
|
|
thread_unlock(td);
|
|
mtx_unlock(&umtx_lock);
|
|
}
|
|
umtx_key_release(&key);
|
|
return (error);
|
|
}
|
|
|
|
static int
|
|
do_set_ceiling(struct thread *td, struct umutex *m, uint32_t ceiling,
|
|
uint32_t *old_ceiling)
|
|
{
|
|
struct umtx_q *uq;
|
|
uint32_t flags, id, owner, save_ceiling;
|
|
int error, rv, rv1;
|
|
|
|
error = fueword32(&m->m_flags, &flags);
|
|
if (error == -1)
|
|
return (EFAULT);
|
|
if ((flags & UMUTEX_PRIO_PROTECT) == 0)
|
|
return (EINVAL);
|
|
if (ceiling > RTP_PRIO_MAX)
|
|
return (EINVAL);
|
|
id = td->td_tid;
|
|
uq = td->td_umtxq;
|
|
if ((error = umtx_key_get(m, (flags & UMUTEX_ROBUST) != 0 ?
|
|
TYPE_PP_ROBUST_UMUTEX : TYPE_PP_UMUTEX, GET_SHARE(flags),
|
|
&uq->uq_key)) != 0)
|
|
return (error);
|
|
for (;;) {
|
|
umtxq_lock(&uq->uq_key);
|
|
umtxq_busy(&uq->uq_key);
|
|
umtxq_unlock(&uq->uq_key);
|
|
|
|
rv = fueword32(&m->m_ceilings[0], &save_ceiling);
|
|
if (rv == -1) {
|
|
error = EFAULT;
|
|
break;
|
|
}
|
|
|
|
rv = casueword32(&m->m_owner, UMUTEX_CONTESTED, &owner,
|
|
id | UMUTEX_CONTESTED);
|
|
if (rv == -1) {
|
|
error = EFAULT;
|
|
break;
|
|
}
|
|
|
|
if (rv == 0) {
|
|
MPASS(owner == UMUTEX_CONTESTED);
|
|
rv = suword32(&m->m_ceilings[0], ceiling);
|
|
rv1 = suword32(&m->m_owner, UMUTEX_CONTESTED);
|
|
error = (rv == 0 && rv1 == 0) ? 0: EFAULT;
|
|
break;
|
|
}
|
|
|
|
if ((owner & ~UMUTEX_CONTESTED) == id) {
|
|
rv = suword32(&m->m_ceilings[0], ceiling);
|
|
error = rv == 0 ? 0 : EFAULT;
|
|
break;
|
|
}
|
|
|
|
if (owner == UMUTEX_RB_OWNERDEAD) {
|
|
error = EOWNERDEAD;
|
|
break;
|
|
} else if (owner == UMUTEX_RB_NOTRECOV) {
|
|
error = ENOTRECOVERABLE;
|
|
break;
|
|
}
|
|
|
|
/*
|
|
* If we caught a signal, we have retried and now
|
|
* exit immediately.
|
|
*/
|
|
if (error != 0)
|
|
break;
|
|
|
|
/*
|
|
* We set the contested bit, sleep. Otherwise the lock changed
|
|
* and we need to retry or we lost a race to the thread
|
|
* unlocking the umtx.
|
|
*/
|
|
umtxq_lock(&uq->uq_key);
|
|
umtxq_insert(uq);
|
|
umtxq_unbusy(&uq->uq_key);
|
|
error = umtxq_sleep(uq, "umtxpp", NULL);
|
|
umtxq_remove(uq);
|
|
umtxq_unlock(&uq->uq_key);
|
|
}
|
|
umtxq_lock(&uq->uq_key);
|
|
if (error == 0)
|
|
umtxq_signal(&uq->uq_key, INT_MAX);
|
|
umtxq_unbusy(&uq->uq_key);
|
|
umtxq_unlock(&uq->uq_key);
|
|
umtx_key_release(&uq->uq_key);
|
|
if (error == 0 && old_ceiling != NULL) {
|
|
rv = suword32(old_ceiling, save_ceiling);
|
|
error = rv == 0 ? 0 : EFAULT;
|
|
}
|
|
return (error);
|
|
}
|
|
|
|
/*
|
|
* Lock a userland POSIX mutex.
|
|
*/
|
|
static int
|
|
do_lock_umutex(struct thread *td, struct umutex *m,
|
|
struct _umtx_time *timeout, int mode)
|
|
{
|
|
uint32_t flags;
|
|
int error;
|
|
|
|
error = fueword32(&m->m_flags, &flags);
|
|
if (error == -1)
|
|
return (EFAULT);
|
|
|
|
switch (flags & (UMUTEX_PRIO_INHERIT | UMUTEX_PRIO_PROTECT)) {
|
|
case 0:
|
|
error = do_lock_normal(td, m, flags, timeout, mode);
|
|
break;
|
|
case UMUTEX_PRIO_INHERIT:
|
|
error = do_lock_pi(td, m, flags, timeout, mode);
|
|
break;
|
|
case UMUTEX_PRIO_PROTECT:
|
|
error = do_lock_pp(td, m, flags, timeout, mode);
|
|
break;
|
|
default:
|
|
return (EINVAL);
|
|
}
|
|
if (timeout == NULL) {
|
|
if (error == EINTR && mode != _UMUTEX_WAIT)
|
|
error = ERESTART;
|
|
} else {
|
|
/* Timed-locking is not restarted. */
|
|
if (error == ERESTART)
|
|
error = EINTR;
|
|
}
|
|
return (error);
|
|
}
|
|
|
|
/*
|
|
* Unlock a userland POSIX mutex.
|
|
*/
|
|
static int
|
|
do_unlock_umutex(struct thread *td, struct umutex *m, bool rb)
|
|
{
|
|
uint32_t flags;
|
|
int error;
|
|
|
|
error = fueword32(&m->m_flags, &flags);
|
|
if (error == -1)
|
|
return (EFAULT);
|
|
|
|
switch (flags & (UMUTEX_PRIO_INHERIT | UMUTEX_PRIO_PROTECT)) {
|
|
case 0:
|
|
return (do_unlock_normal(td, m, flags, rb));
|
|
case UMUTEX_PRIO_INHERIT:
|
|
return (do_unlock_pi(td, m, flags, rb));
|
|
case UMUTEX_PRIO_PROTECT:
|
|
return (do_unlock_pp(td, m, flags, rb));
|
|
}
|
|
|
|
return (EINVAL);
|
|
}
|
|
|
|
static int
|
|
do_cv_wait(struct thread *td, struct ucond *cv, struct umutex *m,
|
|
struct timespec *timeout, u_long wflags)
|
|
{
|
|
struct umtx_abs_timeout timo;
|
|
struct umtx_q *uq;
|
|
uint32_t flags, clockid, hasw;
|
|
int error;
|
|
|
|
uq = td->td_umtxq;
|
|
error = fueword32(&cv->c_flags, &flags);
|
|
if (error == -1)
|
|
return (EFAULT);
|
|
error = umtx_key_get(cv, TYPE_CV, GET_SHARE(flags), &uq->uq_key);
|
|
if (error != 0)
|
|
return (error);
|
|
|
|
if ((wflags & CVWAIT_CLOCKID) != 0) {
|
|
error = fueword32(&cv->c_clockid, &clockid);
|
|
if (error == -1) {
|
|
umtx_key_release(&uq->uq_key);
|
|
return (EFAULT);
|
|
}
|
|
if (clockid < CLOCK_REALTIME ||
|
|
clockid >= CLOCK_THREAD_CPUTIME_ID) {
|
|
/* hmm, only HW clock id will work. */
|
|
umtx_key_release(&uq->uq_key);
|
|
return (EINVAL);
|
|
}
|
|
} else {
|
|
clockid = CLOCK_REALTIME;
|
|
}
|
|
|
|
umtxq_lock(&uq->uq_key);
|
|
umtxq_busy(&uq->uq_key);
|
|
umtxq_insert(uq);
|
|
umtxq_unlock(&uq->uq_key);
|
|
|
|
/*
|
|
* Set c_has_waiters to 1 before releasing user mutex, also
|
|
* don't modify cache line when unnecessary.
|
|
*/
|
|
error = fueword32(&cv->c_has_waiters, &hasw);
|
|
if (error == 0 && hasw == 0)
|
|
suword32(&cv->c_has_waiters, 1);
|
|
|
|
umtxq_unbusy_unlocked(&uq->uq_key);
|
|
|
|
error = do_unlock_umutex(td, m, false);
|
|
|
|
if (timeout != NULL)
|
|
umtx_abs_timeout_init(&timo, clockid,
|
|
(wflags & CVWAIT_ABSTIME) != 0, timeout);
|
|
|
|
umtxq_lock(&uq->uq_key);
|
|
if (error == 0) {
|
|
error = umtxq_sleep(uq, "ucond", timeout == NULL ?
|
|
NULL : &timo);
|
|
}
|
|
|
|
if ((uq->uq_flags & UQF_UMTXQ) == 0)
|
|
error = 0;
|
|
else {
|
|
/*
|
|
* This must be timeout,interrupted by signal or
|
|
* surprious wakeup, clear c_has_waiter flag when
|
|
* necessary.
|
|
*/
|
|
umtxq_busy(&uq->uq_key);
|
|
if ((uq->uq_flags & UQF_UMTXQ) != 0) {
|
|
int oldlen = uq->uq_cur_queue->length;
|
|
umtxq_remove(uq);
|
|
if (oldlen == 1) {
|
|
umtxq_unlock(&uq->uq_key);
|
|
suword32(&cv->c_has_waiters, 0);
|
|
umtxq_lock(&uq->uq_key);
|
|
}
|
|
}
|
|
umtxq_unbusy(&uq->uq_key);
|
|
if (error == ERESTART)
|
|
error = EINTR;
|
|
}
|
|
|
|
umtxq_unlock(&uq->uq_key);
|
|
umtx_key_release(&uq->uq_key);
|
|
return (error);
|
|
}
|
|
|
|
/*
|
|
* Signal a userland condition variable.
|
|
*/
|
|
static int
|
|
do_cv_signal(struct thread *td, struct ucond *cv)
|
|
{
|
|
struct umtx_key key;
|
|
int error, cnt, nwake;
|
|
uint32_t flags;
|
|
|
|
error = fueword32(&cv->c_flags, &flags);
|
|
if (error == -1)
|
|
return (EFAULT);
|
|
if ((error = umtx_key_get(cv, TYPE_CV, GET_SHARE(flags), &key)) != 0)
|
|
return (error);
|
|
umtxq_lock(&key);
|
|
umtxq_busy(&key);
|
|
cnt = umtxq_count(&key);
|
|
nwake = umtxq_signal(&key, 1);
|
|
if (cnt <= nwake) {
|
|
umtxq_unlock(&key);
|
|
error = suword32(&cv->c_has_waiters, 0);
|
|
if (error == -1)
|
|
error = EFAULT;
|
|
umtxq_lock(&key);
|
|
}
|
|
umtxq_unbusy(&key);
|
|
umtxq_unlock(&key);
|
|
umtx_key_release(&key);
|
|
return (error);
|
|
}
|
|
|
|
static int
|
|
do_cv_broadcast(struct thread *td, struct ucond *cv)
|
|
{
|
|
struct umtx_key key;
|
|
int error;
|
|
uint32_t flags;
|
|
|
|
error = fueword32(&cv->c_flags, &flags);
|
|
if (error == -1)
|
|
return (EFAULT);
|
|
if ((error = umtx_key_get(cv, TYPE_CV, GET_SHARE(flags), &key)) != 0)
|
|
return (error);
|
|
|
|
umtxq_lock(&key);
|
|
umtxq_busy(&key);
|
|
umtxq_signal(&key, INT_MAX);
|
|
umtxq_unlock(&key);
|
|
|
|
error = suword32(&cv->c_has_waiters, 0);
|
|
if (error == -1)
|
|
error = EFAULT;
|
|
|
|
umtxq_unbusy_unlocked(&key);
|
|
|
|
umtx_key_release(&key);
|
|
return (error);
|
|
}
|
|
|
|
static int
|
|
do_rw_rdlock(struct thread *td, struct urwlock *rwlock, long fflag,
|
|
struct _umtx_time *timeout)
|
|
{
|
|
struct umtx_abs_timeout timo;
|
|
struct umtx_q *uq;
|
|
uint32_t flags, wrflags;
|
|
int32_t state, oldstate;
|
|
int32_t blocked_readers;
|
|
int error, error1, rv;
|
|
|
|
uq = td->td_umtxq;
|
|
error = fueword32(&rwlock->rw_flags, &flags);
|
|
if (error == -1)
|
|
return (EFAULT);
|
|
error = umtx_key_get(rwlock, TYPE_RWLOCK, GET_SHARE(flags), &uq->uq_key);
|
|
if (error != 0)
|
|
return (error);
|
|
|
|
if (timeout != NULL)
|
|
umtx_abs_timeout_init2(&timo, timeout);
|
|
|
|
wrflags = URWLOCK_WRITE_OWNER;
|
|
if (!(fflag & URWLOCK_PREFER_READER) && !(flags & URWLOCK_PREFER_READER))
|
|
wrflags |= URWLOCK_WRITE_WAITERS;
|
|
|
|
for (;;) {
|
|
rv = fueword32(&rwlock->rw_state, &state);
|
|
if (rv == -1) {
|
|
umtx_key_release(&uq->uq_key);
|
|
return (EFAULT);
|
|
}
|
|
|
|
/* try to lock it */
|
|
while (!(state & wrflags)) {
|
|
if (__predict_false(URWLOCK_READER_COUNT(state) ==
|
|
URWLOCK_MAX_READERS)) {
|
|
umtx_key_release(&uq->uq_key);
|
|
return (EAGAIN);
|
|
}
|
|
rv = casueword32(&rwlock->rw_state, state,
|
|
&oldstate, state + 1);
|
|
if (rv == -1) {
|
|
umtx_key_release(&uq->uq_key);
|
|
return (EFAULT);
|
|
}
|
|
if (rv == 0) {
|
|
MPASS(oldstate == state);
|
|
umtx_key_release(&uq->uq_key);
|
|
return (0);
|
|
}
|
|
error = thread_check_susp(td, true);
|
|
if (error != 0)
|
|
break;
|
|
state = oldstate;
|
|
}
|
|
|
|
if (error)
|
|
break;
|
|
|
|
/* grab monitor lock */
|
|
umtxq_lock(&uq->uq_key);
|
|
umtxq_busy(&uq->uq_key);
|
|
umtxq_unlock(&uq->uq_key);
|
|
|
|
/*
|
|
* re-read the state, in case it changed between the try-lock above
|
|
* and the check below
|
|
*/
|
|
rv = fueword32(&rwlock->rw_state, &state);
|
|
if (rv == -1)
|
|
error = EFAULT;
|
|
|
|
/* set read contention bit */
|
|
while (error == 0 && (state & wrflags) &&
|
|
!(state & URWLOCK_READ_WAITERS)) {
|
|
rv = casueword32(&rwlock->rw_state, state,
|
|
&oldstate, state | URWLOCK_READ_WAITERS);
|
|
if (rv == -1) {
|
|
error = EFAULT;
|
|
break;
|
|
}
|
|
if (rv == 0) {
|
|
MPASS(oldstate == state);
|
|
goto sleep;
|
|
}
|
|
state = oldstate;
|
|
error = thread_check_susp(td, false);
|
|
if (error != 0)
|
|
break;
|
|
}
|
|
if (error != 0) {
|
|
umtxq_unbusy_unlocked(&uq->uq_key);
|
|
break;
|
|
}
|
|
|
|
/* state is changed while setting flags, restart */
|
|
if (!(state & wrflags)) {
|
|
umtxq_unbusy_unlocked(&uq->uq_key);
|
|
error = thread_check_susp(td, true);
|
|
if (error != 0)
|
|
break;
|
|
continue;
|
|
}
|
|
|
|
sleep:
|
|
/*
|
|
* Contention bit is set, before sleeping, increase
|
|
* read waiter count.
|
|
*/
|
|
rv = fueword32(&rwlock->rw_blocked_readers,
|
|
&blocked_readers);
|
|
if (rv == -1) {
|
|
umtxq_unbusy_unlocked(&uq->uq_key);
|
|
error = EFAULT;
|
|
break;
|
|
}
|
|
suword32(&rwlock->rw_blocked_readers, blocked_readers+1);
|
|
|
|
while (state & wrflags) {
|
|
umtxq_lock(&uq->uq_key);
|
|
umtxq_insert(uq);
|
|
umtxq_unbusy(&uq->uq_key);
|
|
|
|
error = umtxq_sleep(uq, "urdlck", timeout == NULL ?
|
|
NULL : &timo);
|
|
|
|
umtxq_busy(&uq->uq_key);
|
|
umtxq_remove(uq);
|
|
umtxq_unlock(&uq->uq_key);
|
|
if (error)
|
|
break;
|
|
rv = fueword32(&rwlock->rw_state, &state);
|
|
if (rv == -1) {
|
|
error = EFAULT;
|
|
break;
|
|
}
|
|
}
|
|
|
|
/* decrease read waiter count, and may clear read contention bit */
|
|
rv = fueword32(&rwlock->rw_blocked_readers,
|
|
&blocked_readers);
|
|
if (rv == -1) {
|
|
umtxq_unbusy_unlocked(&uq->uq_key);
|
|
error = EFAULT;
|
|
break;
|
|
}
|
|
suword32(&rwlock->rw_blocked_readers, blocked_readers-1);
|
|
if (blocked_readers == 1) {
|
|
rv = fueword32(&rwlock->rw_state, &state);
|
|
if (rv == -1) {
|
|
umtxq_unbusy_unlocked(&uq->uq_key);
|
|
error = EFAULT;
|
|
break;
|
|
}
|
|
for (;;) {
|
|
rv = casueword32(&rwlock->rw_state, state,
|
|
&oldstate, state & ~URWLOCK_READ_WAITERS);
|
|
if (rv == -1) {
|
|
error = EFAULT;
|
|
break;
|
|
}
|
|
if (rv == 0) {
|
|
MPASS(oldstate == state);
|
|
break;
|
|
}
|
|
state = oldstate;
|
|
error1 = thread_check_susp(td, false);
|
|
if (error1 != 0) {
|
|
if (error == 0)
|
|
error = error1;
|
|
break;
|
|
}
|
|
}
|
|
}
|
|
|
|
umtxq_unbusy_unlocked(&uq->uq_key);
|
|
if (error != 0)
|
|
break;
|
|
}
|
|
umtx_key_release(&uq->uq_key);
|
|
if (error == ERESTART)
|
|
error = EINTR;
|
|
return (error);
|
|
}
|
|
|
|
static int
|
|
do_rw_wrlock(struct thread *td, struct urwlock *rwlock, struct _umtx_time *timeout)
|
|
{
|
|
struct umtx_abs_timeout timo;
|
|
struct umtx_q *uq;
|
|
uint32_t flags;
|
|
int32_t state, oldstate;
|
|
int32_t blocked_writers;
|
|
int32_t blocked_readers;
|
|
int error, error1, rv;
|
|
|
|
uq = td->td_umtxq;
|
|
error = fueword32(&rwlock->rw_flags, &flags);
|
|
if (error == -1)
|
|
return (EFAULT);
|
|
error = umtx_key_get(rwlock, TYPE_RWLOCK, GET_SHARE(flags), &uq->uq_key);
|
|
if (error != 0)
|
|
return (error);
|
|
|
|
if (timeout != NULL)
|
|
umtx_abs_timeout_init2(&timo, timeout);
|
|
|
|
blocked_readers = 0;
|
|
for (;;) {
|
|
rv = fueword32(&rwlock->rw_state, &state);
|
|
if (rv == -1) {
|
|
umtx_key_release(&uq->uq_key);
|
|
return (EFAULT);
|
|
}
|
|
while ((state & URWLOCK_WRITE_OWNER) == 0 &&
|
|
URWLOCK_READER_COUNT(state) == 0) {
|
|
rv = casueword32(&rwlock->rw_state, state,
|
|
&oldstate, state | URWLOCK_WRITE_OWNER);
|
|
if (rv == -1) {
|
|
umtx_key_release(&uq->uq_key);
|
|
return (EFAULT);
|
|
}
|
|
if (rv == 0) {
|
|
MPASS(oldstate == state);
|
|
umtx_key_release(&uq->uq_key);
|
|
return (0);
|
|
}
|
|
state = oldstate;
|
|
error = thread_check_susp(td, true);
|
|
if (error != 0)
|
|
break;
|
|
}
|
|
|
|
if (error) {
|
|
if ((state & (URWLOCK_WRITE_OWNER |
|
|
URWLOCK_WRITE_WAITERS)) == 0 &&
|
|
blocked_readers != 0) {
|
|
umtxq_lock(&uq->uq_key);
|
|
umtxq_busy(&uq->uq_key);
|
|
umtxq_signal_queue(&uq->uq_key, INT_MAX,
|
|
UMTX_SHARED_QUEUE);
|
|
umtxq_unbusy(&uq->uq_key);
|
|
umtxq_unlock(&uq->uq_key);
|
|
}
|
|
|
|
break;
|
|
}
|
|
|
|
/* grab monitor lock */
|
|
umtxq_lock(&uq->uq_key);
|
|
umtxq_busy(&uq->uq_key);
|
|
umtxq_unlock(&uq->uq_key);
|
|
|
|
/*
|
|
* Re-read the state, in case it changed between the
|
|
* try-lock above and the check below.
|
|
*/
|
|
rv = fueword32(&rwlock->rw_state, &state);
|
|
if (rv == -1)
|
|
error = EFAULT;
|
|
|
|
while (error == 0 && ((state & URWLOCK_WRITE_OWNER) ||
|
|
URWLOCK_READER_COUNT(state) != 0) &&
|
|
(state & URWLOCK_WRITE_WAITERS) == 0) {
|
|
rv = casueword32(&rwlock->rw_state, state,
|
|
&oldstate, state | URWLOCK_WRITE_WAITERS);
|
|
if (rv == -1) {
|
|
error = EFAULT;
|
|
break;
|
|
}
|
|
if (rv == 0) {
|
|
MPASS(oldstate == state);
|
|
goto sleep;
|
|
}
|
|
state = oldstate;
|
|
error = thread_check_susp(td, false);
|
|
if (error != 0)
|
|
break;
|
|
}
|
|
if (error != 0) {
|
|
umtxq_unbusy_unlocked(&uq->uq_key);
|
|
break;
|
|
}
|
|
|
|
if ((state & URWLOCK_WRITE_OWNER) == 0 &&
|
|
URWLOCK_READER_COUNT(state) == 0) {
|
|
umtxq_unbusy_unlocked(&uq->uq_key);
|
|
error = thread_check_susp(td, false);
|
|
if (error != 0)
|
|
break;
|
|
continue;
|
|
}
|
|
sleep:
|
|
rv = fueword32(&rwlock->rw_blocked_writers,
|
|
&blocked_writers);
|
|
if (rv == -1) {
|
|
umtxq_unbusy_unlocked(&uq->uq_key);
|
|
error = EFAULT;
|
|
break;
|
|
}
|
|
suword32(&rwlock->rw_blocked_writers, blocked_writers + 1);
|
|
|
|
while ((state & URWLOCK_WRITE_OWNER) ||
|
|
URWLOCK_READER_COUNT(state) != 0) {
|
|
umtxq_lock(&uq->uq_key);
|
|
umtxq_insert_queue(uq, UMTX_EXCLUSIVE_QUEUE);
|
|
umtxq_unbusy(&uq->uq_key);
|
|
|
|
error = umtxq_sleep(uq, "uwrlck", timeout == NULL ?
|
|
NULL : &timo);
|
|
|
|
umtxq_busy(&uq->uq_key);
|
|
umtxq_remove_queue(uq, UMTX_EXCLUSIVE_QUEUE);
|
|
umtxq_unlock(&uq->uq_key);
|
|
if (error)
|
|
break;
|
|
rv = fueword32(&rwlock->rw_state, &state);
|
|
if (rv == -1) {
|
|
error = EFAULT;
|
|
break;
|
|
}
|
|
}
|
|
|
|
rv = fueword32(&rwlock->rw_blocked_writers,
|
|
&blocked_writers);
|
|
if (rv == -1) {
|
|
umtxq_unbusy_unlocked(&uq->uq_key);
|
|
error = EFAULT;
|
|
break;
|
|
}
|
|
suword32(&rwlock->rw_blocked_writers, blocked_writers-1);
|
|
if (blocked_writers == 1) {
|
|
rv = fueword32(&rwlock->rw_state, &state);
|
|
if (rv == -1) {
|
|
umtxq_unbusy_unlocked(&uq->uq_key);
|
|
error = EFAULT;
|
|
break;
|
|
}
|
|
for (;;) {
|
|
rv = casueword32(&rwlock->rw_state, state,
|
|
&oldstate, state & ~URWLOCK_WRITE_WAITERS);
|
|
if (rv == -1) {
|
|
error = EFAULT;
|
|
break;
|
|
}
|
|
if (rv == 0) {
|
|
MPASS(oldstate == state);
|
|
break;
|
|
}
|
|
state = oldstate;
|
|
error1 = thread_check_susp(td, false);
|
|
/*
|
|
* We are leaving the URWLOCK_WRITE_WAITERS
|
|
* behind, but this should not harm the
|
|
* correctness.
|
|
*/
|
|
if (error1 != 0) {
|
|
if (error == 0)
|
|
error = error1;
|
|
break;
|
|
}
|
|
}
|
|
rv = fueword32(&rwlock->rw_blocked_readers,
|
|
&blocked_readers);
|
|
if (rv == -1) {
|
|
umtxq_unbusy_unlocked(&uq->uq_key);
|
|
error = EFAULT;
|
|
break;
|
|
}
|
|
} else
|
|
blocked_readers = 0;
|
|
|
|
umtxq_unbusy_unlocked(&uq->uq_key);
|
|
}
|
|
|
|
umtx_key_release(&uq->uq_key);
|
|
if (error == ERESTART)
|
|
error = EINTR;
|
|
return (error);
|
|
}
|
|
|
|
static int
|
|
do_rw_unlock(struct thread *td, struct urwlock *rwlock)
|
|
{
|
|
struct umtx_q *uq;
|
|
uint32_t flags;
|
|
int32_t state, oldstate;
|
|
int error, rv, q, count;
|
|
|
|
uq = td->td_umtxq;
|
|
error = fueword32(&rwlock->rw_flags, &flags);
|
|
if (error == -1)
|
|
return (EFAULT);
|
|
error = umtx_key_get(rwlock, TYPE_RWLOCK, GET_SHARE(flags), &uq->uq_key);
|
|
if (error != 0)
|
|
return (error);
|
|
|
|
error = fueword32(&rwlock->rw_state, &state);
|
|
if (error == -1) {
|
|
error = EFAULT;
|
|
goto out;
|
|
}
|
|
if (state & URWLOCK_WRITE_OWNER) {
|
|
for (;;) {
|
|
rv = casueword32(&rwlock->rw_state, state,
|
|
&oldstate, state & ~URWLOCK_WRITE_OWNER);
|
|
if (rv == -1) {
|
|
error = EFAULT;
|
|
goto out;
|
|
}
|
|
if (rv == 1) {
|
|
state = oldstate;
|
|
if (!(oldstate & URWLOCK_WRITE_OWNER)) {
|
|
error = EPERM;
|
|
goto out;
|
|
}
|
|
error = thread_check_susp(td, true);
|
|
if (error != 0)
|
|
goto out;
|
|
} else
|
|
break;
|
|
}
|
|
} else if (URWLOCK_READER_COUNT(state) != 0) {
|
|
for (;;) {
|
|
rv = casueword32(&rwlock->rw_state, state,
|
|
&oldstate, state - 1);
|
|
if (rv == -1) {
|
|
error = EFAULT;
|
|
goto out;
|
|
}
|
|
if (rv == 1) {
|
|
state = oldstate;
|
|
if (URWLOCK_READER_COUNT(oldstate) == 0) {
|
|
error = EPERM;
|
|
goto out;
|
|
}
|
|
error = thread_check_susp(td, true);
|
|
if (error != 0)
|
|
goto out;
|
|
} else
|
|
break;
|
|
}
|
|
} else {
|
|
error = EPERM;
|
|
goto out;
|
|
}
|
|
|
|
count = 0;
|
|
|
|
if (!(flags & URWLOCK_PREFER_READER)) {
|
|
if (state & URWLOCK_WRITE_WAITERS) {
|
|
count = 1;
|
|
q = UMTX_EXCLUSIVE_QUEUE;
|
|
} else if (state & URWLOCK_READ_WAITERS) {
|
|
count = INT_MAX;
|
|
q = UMTX_SHARED_QUEUE;
|
|
}
|
|
} else {
|
|
if (state & URWLOCK_READ_WAITERS) {
|
|
count = INT_MAX;
|
|
q = UMTX_SHARED_QUEUE;
|
|
} else if (state & URWLOCK_WRITE_WAITERS) {
|
|
count = 1;
|
|
q = UMTX_EXCLUSIVE_QUEUE;
|
|
}
|
|
}
|
|
|
|
if (count) {
|
|
umtxq_lock(&uq->uq_key);
|
|
umtxq_busy(&uq->uq_key);
|
|
umtxq_signal_queue(&uq->uq_key, count, q);
|
|
umtxq_unbusy(&uq->uq_key);
|
|
umtxq_unlock(&uq->uq_key);
|
|
}
|
|
out:
|
|
umtx_key_release(&uq->uq_key);
|
|
return (error);
|
|
}
|
|
|
|
#if defined(COMPAT_FREEBSD9) || defined(COMPAT_FREEBSD10)
|
|
static int
|
|
do_sem_wait(struct thread *td, struct _usem *sem, struct _umtx_time *timeout)
|
|
{
|
|
struct umtx_abs_timeout timo;
|
|
struct umtx_q *uq;
|
|
uint32_t flags, count, count1;
|
|
int error, rv, rv1;
|
|
|
|
uq = td->td_umtxq;
|
|
error = fueword32(&sem->_flags, &flags);
|
|
if (error == -1)
|
|
return (EFAULT);
|
|
error = umtx_key_get(sem, TYPE_SEM, GET_SHARE(flags), &uq->uq_key);
|
|
if (error != 0)
|
|
return (error);
|
|
|
|
if (timeout != NULL)
|
|
umtx_abs_timeout_init2(&timo, timeout);
|
|
|
|
again:
|
|
umtxq_lock(&uq->uq_key);
|
|
umtxq_busy(&uq->uq_key);
|
|
umtxq_insert(uq);
|
|
umtxq_unlock(&uq->uq_key);
|
|
rv = casueword32(&sem->_has_waiters, 0, &count1, 1);
|
|
if (rv != -1)
|
|
rv1 = fueword32(&sem->_count, &count);
|
|
if (rv == -1 || rv1 == -1 || count != 0 || (rv == 1 && count1 == 0)) {
|
|
if (rv == 0)
|
|
suword32(&sem->_has_waiters, 0);
|
|
umtxq_lock(&uq->uq_key);
|
|
umtxq_unbusy(&uq->uq_key);
|
|
umtxq_remove(uq);
|
|
umtxq_unlock(&uq->uq_key);
|
|
if (rv == -1 || rv1 == -1) {
|
|
error = EFAULT;
|
|
goto out;
|
|
}
|
|
if (count != 0) {
|
|
error = 0;
|
|
goto out;
|
|
}
|
|
MPASS(rv == 1 && count1 == 0);
|
|
rv = thread_check_susp(td, true);
|
|
if (rv == 0)
|
|
goto again;
|
|
error = rv;
|
|
goto out;
|
|
}
|
|
umtxq_lock(&uq->uq_key);
|
|
umtxq_unbusy(&uq->uq_key);
|
|
|
|
error = umtxq_sleep(uq, "usem", timeout == NULL ? NULL : &timo);
|
|
|
|
if ((uq->uq_flags & UQF_UMTXQ) == 0)
|
|
error = 0;
|
|
else {
|
|
umtxq_remove(uq);
|
|
/* A relative timeout cannot be restarted. */
|
|
if (error == ERESTART && timeout != NULL &&
|
|
(timeout->_flags & UMTX_ABSTIME) == 0)
|
|
error = EINTR;
|
|
}
|
|
umtxq_unlock(&uq->uq_key);
|
|
out:
|
|
umtx_key_release(&uq->uq_key);
|
|
return (error);
|
|
}
|
|
|
|
/*
|
|
* Signal a userland semaphore.
|
|
*/
|
|
static int
|
|
do_sem_wake(struct thread *td, struct _usem *sem)
|
|
{
|
|
struct umtx_key key;
|
|
int error, cnt;
|
|
uint32_t flags;
|
|
|
|
error = fueword32(&sem->_flags, &flags);
|
|
if (error == -1)
|
|
return (EFAULT);
|
|
if ((error = umtx_key_get(sem, TYPE_SEM, GET_SHARE(flags), &key)) != 0)
|
|
return (error);
|
|
umtxq_lock(&key);
|
|
umtxq_busy(&key);
|
|
cnt = umtxq_count(&key);
|
|
if (cnt > 0) {
|
|
/*
|
|
* Check if count is greater than 0, this means the memory is
|
|
* still being referenced by user code, so we can safely
|
|
* update _has_waiters flag.
|
|
*/
|
|
if (cnt == 1) {
|
|
umtxq_unlock(&key);
|
|
error = suword32(&sem->_has_waiters, 0);
|
|
umtxq_lock(&key);
|
|
if (error == -1)
|
|
error = EFAULT;
|
|
}
|
|
umtxq_signal(&key, 1);
|
|
}
|
|
umtxq_unbusy(&key);
|
|
umtxq_unlock(&key);
|
|
umtx_key_release(&key);
|
|
return (error);
|
|
}
|
|
#endif
|
|
|
|
static int
|
|
do_sem2_wait(struct thread *td, struct _usem2 *sem, struct _umtx_time *timeout)
|
|
{
|
|
struct umtx_abs_timeout timo;
|
|
struct umtx_q *uq;
|
|
uint32_t count, flags;
|
|
int error, rv;
|
|
|
|
uq = td->td_umtxq;
|
|
flags = fuword32(&sem->_flags);
|
|
if (timeout != NULL)
|
|
umtx_abs_timeout_init2(&timo, timeout);
|
|
|
|
again:
|
|
error = umtx_key_get(sem, TYPE_SEM, GET_SHARE(flags), &uq->uq_key);
|
|
if (error != 0)
|
|
return (error);
|
|
umtxq_lock(&uq->uq_key);
|
|
umtxq_busy(&uq->uq_key);
|
|
umtxq_insert(uq);
|
|
umtxq_unlock(&uq->uq_key);
|
|
rv = fueword32(&sem->_count, &count);
|
|
if (rv == -1) {
|
|
umtxq_lock(&uq->uq_key);
|
|
umtxq_unbusy(&uq->uq_key);
|
|
umtxq_remove(uq);
|
|
umtxq_unlock(&uq->uq_key);
|
|
umtx_key_release(&uq->uq_key);
|
|
return (EFAULT);
|
|
}
|
|
for (;;) {
|
|
if (USEM_COUNT(count) != 0) {
|
|
umtxq_lock(&uq->uq_key);
|
|
umtxq_unbusy(&uq->uq_key);
|
|
umtxq_remove(uq);
|
|
umtxq_unlock(&uq->uq_key);
|
|
umtx_key_release(&uq->uq_key);
|
|
return (0);
|
|
}
|
|
if (count == USEM_HAS_WAITERS)
|
|
break;
|
|
rv = casueword32(&sem->_count, 0, &count, USEM_HAS_WAITERS);
|
|
if (rv == 0)
|
|
break;
|
|
umtxq_lock(&uq->uq_key);
|
|
umtxq_unbusy(&uq->uq_key);
|
|
umtxq_remove(uq);
|
|
umtxq_unlock(&uq->uq_key);
|
|
umtx_key_release(&uq->uq_key);
|
|
if (rv == -1)
|
|
return (EFAULT);
|
|
rv = thread_check_susp(td, true);
|
|
if (rv != 0)
|
|
return (rv);
|
|
goto again;
|
|
}
|
|
umtxq_lock(&uq->uq_key);
|
|
umtxq_unbusy(&uq->uq_key);
|
|
|
|
error = umtxq_sleep(uq, "usem", timeout == NULL ? NULL : &timo);
|
|
|
|
if ((uq->uq_flags & UQF_UMTXQ) == 0)
|
|
error = 0;
|
|
else {
|
|
umtxq_remove(uq);
|
|
if (timeout != NULL && (timeout->_flags & UMTX_ABSTIME) == 0) {
|
|
/* A relative timeout cannot be restarted. */
|
|
if (error == ERESTART)
|
|
error = EINTR;
|
|
if (error == EINTR) {
|
|
kern_clock_gettime(curthread, timo.clockid,
|
|
&timo.cur);
|
|
timespecsub(&timo.end, &timo.cur,
|
|
&timeout->_timeout);
|
|
}
|
|
}
|
|
}
|
|
umtxq_unlock(&uq->uq_key);
|
|
umtx_key_release(&uq->uq_key);
|
|
return (error);
|
|
}
|
|
|
|
/*
|
|
* Signal a userland semaphore.
|
|
*/
|
|
static int
|
|
do_sem2_wake(struct thread *td, struct _usem2 *sem)
|
|
{
|
|
struct umtx_key key;
|
|
int error, cnt, rv;
|
|
uint32_t count, flags;
|
|
|
|
rv = fueword32(&sem->_flags, &flags);
|
|
if (rv == -1)
|
|
return (EFAULT);
|
|
if ((error = umtx_key_get(sem, TYPE_SEM, GET_SHARE(flags), &key)) != 0)
|
|
return (error);
|
|
umtxq_lock(&key);
|
|
umtxq_busy(&key);
|
|
cnt = umtxq_count(&key);
|
|
if (cnt > 0) {
|
|
/*
|
|
* If this was the last sleeping thread, clear the waiters
|
|
* flag in _count.
|
|
*/
|
|
if (cnt == 1) {
|
|
umtxq_unlock(&key);
|
|
rv = fueword32(&sem->_count, &count);
|
|
while (rv != -1 && count & USEM_HAS_WAITERS) {
|
|
rv = casueword32(&sem->_count, count, &count,
|
|
count & ~USEM_HAS_WAITERS);
|
|
if (rv == 1) {
|
|
rv = thread_check_susp(td, true);
|
|
if (rv != 0)
|
|
break;
|
|
}
|
|
}
|
|
if (rv == -1)
|
|
error = EFAULT;
|
|
else if (rv > 0) {
|
|
error = rv;
|
|
}
|
|
umtxq_lock(&key);
|
|
}
|
|
|
|
umtxq_signal(&key, 1);
|
|
}
|
|
umtxq_unbusy(&key);
|
|
umtxq_unlock(&key);
|
|
umtx_key_release(&key);
|
|
return (error);
|
|
}
|
|
|
|
#ifdef COMPAT_FREEBSD10
|
|
int
|
|
freebsd10__umtx_lock(struct thread *td, struct freebsd10__umtx_lock_args *uap)
|
|
{
|
|
return (do_lock_umtx(td, uap->umtx, td->td_tid, 0));
|
|
}
|
|
|
|
int
|
|
freebsd10__umtx_unlock(struct thread *td,
|
|
struct freebsd10__umtx_unlock_args *uap)
|
|
{
|
|
return (do_unlock_umtx(td, uap->umtx, td->td_tid));
|
|
}
|
|
#endif
|
|
|
|
inline int
|
|
umtx_copyin_timeout(const void *uaddr, struct timespec *tsp)
|
|
{
|
|
int error;
|
|
|
|
error = copyin(uaddr, tsp, sizeof(*tsp));
|
|
if (error == 0) {
|
|
if (!timespecvalid_interval(tsp))
|
|
error = EINVAL;
|
|
}
|
|
return (error);
|
|
}
|
|
|
|
static inline int
|
|
umtx_copyin_umtx_time(const void *uaddr, size_t size, struct _umtx_time *tp)
|
|
{
|
|
int error;
|
|
|
|
if (size <= sizeof(tp->_timeout)) {
|
|
tp->_clockid = CLOCK_REALTIME;
|
|
tp->_flags = 0;
|
|
error = copyin(uaddr, &tp->_timeout, sizeof(tp->_timeout));
|
|
} else
|
|
error = copyin(uaddr, tp, sizeof(*tp));
|
|
if (error != 0)
|
|
return (error);
|
|
if (!timespecvalid_interval(&tp->_timeout))
|
|
return (EINVAL);
|
|
return (0);
|
|
}
|
|
|
|
static int
|
|
umtx_copyin_robust_lists(const void *uaddr, size_t size,
|
|
struct umtx_robust_lists_params *rb)
|
|
{
|
|
|
|
if (size > sizeof(*rb))
|
|
return (EINVAL);
|
|
return (copyin(uaddr, rb, size));
|
|
}
|
|
|
|
static int
|
|
umtx_copyout_timeout(void *uaddr, size_t sz, struct timespec *tsp)
|
|
{
|
|
|
|
/*
|
|
* Should be guaranteed by the caller, sz == uaddr1 - sizeof(_umtx_time)
|
|
* and we're only called if sz >= sizeof(timespec) as supplied in the
|
|
* copyops.
|
|
*/
|
|
KASSERT(sz >= sizeof(*tsp),
|
|
("umtx_copyops specifies incorrect sizes"));
|
|
|
|
return (copyout(tsp, uaddr, sizeof(*tsp)));
|
|
}
|
|
|
|
#ifdef COMPAT_FREEBSD10
|
|
static int
|
|
__umtx_op_lock_umtx(struct thread *td, struct _umtx_op_args *uap,
|
|
const struct umtx_copyops *ops)
|
|
{
|
|
struct timespec *ts, timeout;
|
|
int error;
|
|
|
|
/* Allow a null timespec (wait forever). */
|
|
if (uap->uaddr2 == NULL)
|
|
ts = NULL;
|
|
else {
|
|
error = ops->copyin_timeout(uap->uaddr2, &timeout);
|
|
if (error != 0)
|
|
return (error);
|
|
ts = &timeout;
|
|
}
|
|
#ifdef COMPAT_FREEBSD32
|
|
if (ops->compat32)
|
|
return (do_lock_umtx32(td, uap->obj, uap->val, ts));
|
|
#endif
|
|
return (do_lock_umtx(td, uap->obj, uap->val, ts));
|
|
}
|
|
|
|
static int
|
|
__umtx_op_unlock_umtx(struct thread *td, struct _umtx_op_args *uap,
|
|
const struct umtx_copyops *ops)
|
|
{
|
|
#ifdef COMPAT_FREEBSD32
|
|
if (ops->compat32)
|
|
return (do_unlock_umtx32(td, uap->obj, uap->val));
|
|
#endif
|
|
return (do_unlock_umtx(td, uap->obj, uap->val));
|
|
}
|
|
#endif /* COMPAT_FREEBSD10 */
|
|
|
|
#if !defined(COMPAT_FREEBSD10)
|
|
static int
|
|
__umtx_op_unimpl(struct thread *td __unused, struct _umtx_op_args *uap __unused,
|
|
const struct umtx_copyops *ops __unused)
|
|
{
|
|
return (EOPNOTSUPP);
|
|
}
|
|
#endif /* COMPAT_FREEBSD10 */
|
|
|
|
static int
|
|
__umtx_op_wait(struct thread *td, struct _umtx_op_args *uap,
|
|
const struct umtx_copyops *ops)
|
|
{
|
|
struct _umtx_time timeout, *tm_p;
|
|
int error;
|
|
|
|
if (uap->uaddr2 == NULL)
|
|
tm_p = NULL;
|
|
else {
|
|
error = ops->copyin_umtx_time(
|
|
uap->uaddr2, (size_t)uap->uaddr1, &timeout);
|
|
if (error != 0)
|
|
return (error);
|
|
tm_p = &timeout;
|
|
}
|
|
return (do_wait(td, uap->obj, uap->val, tm_p, ops->compat32, 0));
|
|
}
|
|
|
|
static int
|
|
__umtx_op_wait_uint(struct thread *td, struct _umtx_op_args *uap,
|
|
const struct umtx_copyops *ops)
|
|
{
|
|
struct _umtx_time timeout, *tm_p;
|
|
int error;
|
|
|
|
if (uap->uaddr2 == NULL)
|
|
tm_p = NULL;
|
|
else {
|
|
error = ops->copyin_umtx_time(
|
|
uap->uaddr2, (size_t)uap->uaddr1, &timeout);
|
|
if (error != 0)
|
|
return (error);
|
|
tm_p = &timeout;
|
|
}
|
|
return (do_wait(td, uap->obj, uap->val, tm_p, 1, 0));
|
|
}
|
|
|
|
static int
|
|
__umtx_op_wait_uint_private(struct thread *td, struct _umtx_op_args *uap,
|
|
const struct umtx_copyops *ops)
|
|
{
|
|
struct _umtx_time *tm_p, timeout;
|
|
int error;
|
|
|
|
if (uap->uaddr2 == NULL)
|
|
tm_p = NULL;
|
|
else {
|
|
error = ops->copyin_umtx_time(
|
|
uap->uaddr2, (size_t)uap->uaddr1, &timeout);
|
|
if (error != 0)
|
|
return (error);
|
|
tm_p = &timeout;
|
|
}
|
|
return (do_wait(td, uap->obj, uap->val, tm_p, 1, 1));
|
|
}
|
|
|
|
static int
|
|
__umtx_op_wake(struct thread *td, struct _umtx_op_args *uap,
|
|
const struct umtx_copyops *ops __unused)
|
|
{
|
|
|
|
return (kern_umtx_wake(td, uap->obj, uap->val, 0));
|
|
}
|
|
|
|
#define BATCH_SIZE 128
|
|
static int
|
|
__umtx_op_nwake_private_native(struct thread *td, struct _umtx_op_args *uap)
|
|
{
|
|
char *uaddrs[BATCH_SIZE], **upp;
|
|
int count, error, i, pos, tocopy;
|
|
|
|
upp = (char **)uap->obj;
|
|
error = 0;
|
|
for (count = uap->val, pos = 0; count > 0; count -= tocopy,
|
|
pos += tocopy) {
|
|
tocopy = MIN(count, BATCH_SIZE);
|
|
error = copyin(upp + pos, uaddrs, tocopy * sizeof(char *));
|
|
if (error != 0)
|
|
break;
|
|
for (i = 0; i < tocopy; ++i) {
|
|
kern_umtx_wake(td, uaddrs[i], INT_MAX, 1);
|
|
}
|
|
maybe_yield();
|
|
}
|
|
return (error);
|
|
}
|
|
|
|
static int
|
|
__umtx_op_nwake_private_compat32(struct thread *td, struct _umtx_op_args *uap)
|
|
{
|
|
uint32_t uaddrs[BATCH_SIZE], *upp;
|
|
int count, error, i, pos, tocopy;
|
|
|
|
upp = (uint32_t *)uap->obj;
|
|
error = 0;
|
|
for (count = uap->val, pos = 0; count > 0; count -= tocopy,
|
|
pos += tocopy) {
|
|
tocopy = MIN(count, BATCH_SIZE);
|
|
error = copyin(upp + pos, uaddrs, tocopy * sizeof(uint32_t));
|
|
if (error != 0)
|
|
break;
|
|
for (i = 0; i < tocopy; ++i) {
|
|
kern_umtx_wake(td, (void *)(uintptr_t)uaddrs[i],
|
|
INT_MAX, 1);
|
|
}
|
|
maybe_yield();
|
|
}
|
|
return (error);
|
|
}
|
|
|
|
static int
|
|
__umtx_op_nwake_private(struct thread *td, struct _umtx_op_args *uap,
|
|
const struct umtx_copyops *ops)
|
|
{
|
|
|
|
if (ops->compat32)
|
|
return (__umtx_op_nwake_private_compat32(td, uap));
|
|
return (__umtx_op_nwake_private_native(td, uap));
|
|
}
|
|
|
|
static int
|
|
__umtx_op_wake_private(struct thread *td, struct _umtx_op_args *uap,
|
|
const struct umtx_copyops *ops __unused)
|
|
{
|
|
|
|
return (kern_umtx_wake(td, uap->obj, uap->val, 1));
|
|
}
|
|
|
|
static int
|
|
__umtx_op_lock_umutex(struct thread *td, struct _umtx_op_args *uap,
|
|
const struct umtx_copyops *ops)
|
|
{
|
|
struct _umtx_time *tm_p, timeout;
|
|
int error;
|
|
|
|
/* Allow a null timespec (wait forever). */
|
|
if (uap->uaddr2 == NULL)
|
|
tm_p = NULL;
|
|
else {
|
|
error = ops->copyin_umtx_time(
|
|
uap->uaddr2, (size_t)uap->uaddr1, &timeout);
|
|
if (error != 0)
|
|
return (error);
|
|
tm_p = &timeout;
|
|
}
|
|
return (do_lock_umutex(td, uap->obj, tm_p, 0));
|
|
}
|
|
|
|
static int
|
|
__umtx_op_trylock_umutex(struct thread *td, struct _umtx_op_args *uap,
|
|
const struct umtx_copyops *ops __unused)
|
|
{
|
|
|
|
return (do_lock_umutex(td, uap->obj, NULL, _UMUTEX_TRY));
|
|
}
|
|
|
|
static int
|
|
__umtx_op_wait_umutex(struct thread *td, struct _umtx_op_args *uap,
|
|
const struct umtx_copyops *ops)
|
|
{
|
|
struct _umtx_time *tm_p, timeout;
|
|
int error;
|
|
|
|
/* Allow a null timespec (wait forever). */
|
|
if (uap->uaddr2 == NULL)
|
|
tm_p = NULL;
|
|
else {
|
|
error = ops->copyin_umtx_time(
|
|
uap->uaddr2, (size_t)uap->uaddr1, &timeout);
|
|
if (error != 0)
|
|
return (error);
|
|
tm_p = &timeout;
|
|
}
|
|
return (do_lock_umutex(td, uap->obj, tm_p, _UMUTEX_WAIT));
|
|
}
|
|
|
|
static int
|
|
__umtx_op_wake_umutex(struct thread *td, struct _umtx_op_args *uap,
|
|
const struct umtx_copyops *ops __unused)
|
|
{
|
|
|
|
return (do_wake_umutex(td, uap->obj));
|
|
}
|
|
|
|
static int
|
|
__umtx_op_unlock_umutex(struct thread *td, struct _umtx_op_args *uap,
|
|
const struct umtx_copyops *ops __unused)
|
|
{
|
|
|
|
return (do_unlock_umutex(td, uap->obj, false));
|
|
}
|
|
|
|
static int
|
|
__umtx_op_set_ceiling(struct thread *td, struct _umtx_op_args *uap,
|
|
const struct umtx_copyops *ops __unused)
|
|
{
|
|
|
|
return (do_set_ceiling(td, uap->obj, uap->val, uap->uaddr1));
|
|
}
|
|
|
|
static int
|
|
__umtx_op_cv_wait(struct thread *td, struct _umtx_op_args *uap,
|
|
const struct umtx_copyops *ops)
|
|
{
|
|
struct timespec *ts, timeout;
|
|
int error;
|
|
|
|
/* Allow a null timespec (wait forever). */
|
|
if (uap->uaddr2 == NULL)
|
|
ts = NULL;
|
|
else {
|
|
error = ops->copyin_timeout(uap->uaddr2, &timeout);
|
|
if (error != 0)
|
|
return (error);
|
|
ts = &timeout;
|
|
}
|
|
return (do_cv_wait(td, uap->obj, uap->uaddr1, ts, uap->val));
|
|
}
|
|
|
|
static int
|
|
__umtx_op_cv_signal(struct thread *td, struct _umtx_op_args *uap,
|
|
const struct umtx_copyops *ops __unused)
|
|
{
|
|
|
|
return (do_cv_signal(td, uap->obj));
|
|
}
|
|
|
|
static int
|
|
__umtx_op_cv_broadcast(struct thread *td, struct _umtx_op_args *uap,
|
|
const struct umtx_copyops *ops __unused)
|
|
{
|
|
|
|
return (do_cv_broadcast(td, uap->obj));
|
|
}
|
|
|
|
static int
|
|
__umtx_op_rw_rdlock(struct thread *td, struct _umtx_op_args *uap,
|
|
const struct umtx_copyops *ops)
|
|
{
|
|
struct _umtx_time timeout;
|
|
int error;
|
|
|
|
/* Allow a null timespec (wait forever). */
|
|
if (uap->uaddr2 == NULL) {
|
|
error = do_rw_rdlock(td, uap->obj, uap->val, 0);
|
|
} else {
|
|
error = ops->copyin_umtx_time(uap->uaddr2,
|
|
(size_t)uap->uaddr1, &timeout);
|
|
if (error != 0)
|
|
return (error);
|
|
error = do_rw_rdlock(td, uap->obj, uap->val, &timeout);
|
|
}
|
|
return (error);
|
|
}
|
|
|
|
static int
|
|
__umtx_op_rw_wrlock(struct thread *td, struct _umtx_op_args *uap,
|
|
const struct umtx_copyops *ops)
|
|
{
|
|
struct _umtx_time timeout;
|
|
int error;
|
|
|
|
/* Allow a null timespec (wait forever). */
|
|
if (uap->uaddr2 == NULL) {
|
|
error = do_rw_wrlock(td, uap->obj, 0);
|
|
} else {
|
|
error = ops->copyin_umtx_time(uap->uaddr2,
|
|
(size_t)uap->uaddr1, &timeout);
|
|
if (error != 0)
|
|
return (error);
|
|
|
|
error = do_rw_wrlock(td, uap->obj, &timeout);
|
|
}
|
|
return (error);
|
|
}
|
|
|
|
static int
|
|
__umtx_op_rw_unlock(struct thread *td, struct _umtx_op_args *uap,
|
|
const struct umtx_copyops *ops __unused)
|
|
{
|
|
|
|
return (do_rw_unlock(td, uap->obj));
|
|
}
|
|
|
|
#if defined(COMPAT_FREEBSD9) || defined(COMPAT_FREEBSD10)
|
|
static int
|
|
__umtx_op_sem_wait(struct thread *td, struct _umtx_op_args *uap,
|
|
const struct umtx_copyops *ops)
|
|
{
|
|
struct _umtx_time *tm_p, timeout;
|
|
int error;
|
|
|
|
/* Allow a null timespec (wait forever). */
|
|
if (uap->uaddr2 == NULL)
|
|
tm_p = NULL;
|
|
else {
|
|
error = ops->copyin_umtx_time(
|
|
uap->uaddr2, (size_t)uap->uaddr1, &timeout);
|
|
if (error != 0)
|
|
return (error);
|
|
tm_p = &timeout;
|
|
}
|
|
return (do_sem_wait(td, uap->obj, tm_p));
|
|
}
|
|
|
|
static int
|
|
__umtx_op_sem_wake(struct thread *td, struct _umtx_op_args *uap,
|
|
const struct umtx_copyops *ops __unused)
|
|
{
|
|
|
|
return (do_sem_wake(td, uap->obj));
|
|
}
|
|
#endif
|
|
|
|
static int
|
|
__umtx_op_wake2_umutex(struct thread *td, struct _umtx_op_args *uap,
|
|
const struct umtx_copyops *ops __unused)
|
|
{
|
|
|
|
return (do_wake2_umutex(td, uap->obj, uap->val));
|
|
}
|
|
|
|
static int
|
|
__umtx_op_sem2_wait(struct thread *td, struct _umtx_op_args *uap,
|
|
const struct umtx_copyops *ops)
|
|
{
|
|
struct _umtx_time *tm_p, timeout;
|
|
size_t uasize;
|
|
int error;
|
|
|
|
/* Allow a null timespec (wait forever). */
|
|
if (uap->uaddr2 == NULL) {
|
|
uasize = 0;
|
|
tm_p = NULL;
|
|
} else {
|
|
uasize = (size_t)uap->uaddr1;
|
|
error = ops->copyin_umtx_time(uap->uaddr2, uasize, &timeout);
|
|
if (error != 0)
|
|
return (error);
|
|
tm_p = &timeout;
|
|
}
|
|
error = do_sem2_wait(td, uap->obj, tm_p);
|
|
if (error == EINTR && uap->uaddr2 != NULL &&
|
|
(timeout._flags & UMTX_ABSTIME) == 0 &&
|
|
uasize >= ops->umtx_time_sz + ops->timespec_sz) {
|
|
error = ops->copyout_timeout(
|
|
(void *)((uintptr_t)uap->uaddr2 + ops->umtx_time_sz),
|
|
uasize - ops->umtx_time_sz, &timeout._timeout);
|
|
if (error == 0) {
|
|
error = EINTR;
|
|
}
|
|
}
|
|
|
|
return (error);
|
|
}
|
|
|
|
static int
|
|
__umtx_op_sem2_wake(struct thread *td, struct _umtx_op_args *uap,
|
|
const struct umtx_copyops *ops __unused)
|
|
{
|
|
|
|
return (do_sem2_wake(td, uap->obj));
|
|
}
|
|
|
|
#define USHM_OBJ_UMTX(o) \
|
|
((struct umtx_shm_obj_list *)(&(o)->umtx_data))
|
|
|
|
#define USHMF_REG_LINKED 0x0001
|
|
#define USHMF_OBJ_LINKED 0x0002
|
|
struct umtx_shm_reg {
|
|
TAILQ_ENTRY(umtx_shm_reg) ushm_reg_link;
|
|
LIST_ENTRY(umtx_shm_reg) ushm_obj_link;
|
|
struct umtx_key ushm_key;
|
|
struct ucred *ushm_cred;
|
|
struct shmfd *ushm_obj;
|
|
u_int ushm_refcnt;
|
|
u_int ushm_flags;
|
|
};
|
|
|
|
LIST_HEAD(umtx_shm_obj_list, umtx_shm_reg);
|
|
TAILQ_HEAD(umtx_shm_reg_head, umtx_shm_reg);
|
|
|
|
static uma_zone_t umtx_shm_reg_zone;
|
|
static struct umtx_shm_reg_head umtx_shm_registry[UMTX_CHAINS];
|
|
static struct mtx umtx_shm_lock;
|
|
static struct umtx_shm_reg_head umtx_shm_reg_delfree =
|
|
TAILQ_HEAD_INITIALIZER(umtx_shm_reg_delfree);
|
|
|
|
static void umtx_shm_free_reg(struct umtx_shm_reg *reg);
|
|
|
|
static void
|
|
umtx_shm_reg_delfree_tq(void *context __unused, int pending __unused)
|
|
{
|
|
struct umtx_shm_reg_head d;
|
|
struct umtx_shm_reg *reg, *reg1;
|
|
|
|
TAILQ_INIT(&d);
|
|
mtx_lock(&umtx_shm_lock);
|
|
TAILQ_CONCAT(&d, &umtx_shm_reg_delfree, ushm_reg_link);
|
|
mtx_unlock(&umtx_shm_lock);
|
|
TAILQ_FOREACH_SAFE(reg, &d, ushm_reg_link, reg1) {
|
|
TAILQ_REMOVE(&d, reg, ushm_reg_link);
|
|
umtx_shm_free_reg(reg);
|
|
}
|
|
}
|
|
|
|
static struct task umtx_shm_reg_delfree_task =
|
|
TASK_INITIALIZER(0, umtx_shm_reg_delfree_tq, NULL);
|
|
|
|
static struct umtx_shm_reg *
|
|
umtx_shm_find_reg_locked(const struct umtx_key *key)
|
|
{
|
|
struct umtx_shm_reg *reg;
|
|
struct umtx_shm_reg_head *reg_head;
|
|
|
|
KASSERT(key->shared, ("umtx_p_find_rg: private key"));
|
|
mtx_assert(&umtx_shm_lock, MA_OWNED);
|
|
reg_head = &umtx_shm_registry[key->hash];
|
|
TAILQ_FOREACH(reg, reg_head, ushm_reg_link) {
|
|
KASSERT(reg->ushm_key.shared,
|
|
("non-shared key on reg %p %d", reg, reg->ushm_key.shared));
|
|
if (reg->ushm_key.info.shared.object ==
|
|
key->info.shared.object &&
|
|
reg->ushm_key.info.shared.offset ==
|
|
key->info.shared.offset) {
|
|
KASSERT(reg->ushm_key.type == TYPE_SHM, ("TYPE_USHM"));
|
|
KASSERT(reg->ushm_refcnt > 0,
|
|
("reg %p refcnt 0 onlist", reg));
|
|
KASSERT((reg->ushm_flags & USHMF_REG_LINKED) != 0,
|
|
("reg %p not linked", reg));
|
|
reg->ushm_refcnt++;
|
|
return (reg);
|
|
}
|
|
}
|
|
return (NULL);
|
|
}
|
|
|
|
static struct umtx_shm_reg *
|
|
umtx_shm_find_reg(const struct umtx_key *key)
|
|
{
|
|
struct umtx_shm_reg *reg;
|
|
|
|
mtx_lock(&umtx_shm_lock);
|
|
reg = umtx_shm_find_reg_locked(key);
|
|
mtx_unlock(&umtx_shm_lock);
|
|
return (reg);
|
|
}
|
|
|
|
static void
|
|
umtx_shm_free_reg(struct umtx_shm_reg *reg)
|
|
{
|
|
|
|
chgumtxcnt(reg->ushm_cred->cr_ruidinfo, -1, 0);
|
|
crfree(reg->ushm_cred);
|
|
shm_drop(reg->ushm_obj);
|
|
uma_zfree(umtx_shm_reg_zone, reg);
|
|
}
|
|
|
|
static bool
|
|
umtx_shm_unref_reg_locked(struct umtx_shm_reg *reg, bool force)
|
|
{
|
|
bool res;
|
|
|
|
mtx_assert(&umtx_shm_lock, MA_OWNED);
|
|
KASSERT(reg->ushm_refcnt > 0, ("ushm_reg %p refcnt 0", reg));
|
|
reg->ushm_refcnt--;
|
|
res = reg->ushm_refcnt == 0;
|
|
if (res || force) {
|
|
if ((reg->ushm_flags & USHMF_REG_LINKED) != 0) {
|
|
TAILQ_REMOVE(&umtx_shm_registry[reg->ushm_key.hash],
|
|
reg, ushm_reg_link);
|
|
reg->ushm_flags &= ~USHMF_REG_LINKED;
|
|
}
|
|
if ((reg->ushm_flags & USHMF_OBJ_LINKED) != 0) {
|
|
LIST_REMOVE(reg, ushm_obj_link);
|
|
reg->ushm_flags &= ~USHMF_OBJ_LINKED;
|
|
}
|
|
}
|
|
return (res);
|
|
}
|
|
|
|
static void
|
|
umtx_shm_unref_reg(struct umtx_shm_reg *reg, bool force)
|
|
{
|
|
vm_object_t object;
|
|
bool dofree;
|
|
|
|
if (force) {
|
|
object = reg->ushm_obj->shm_object;
|
|
VM_OBJECT_WLOCK(object);
|
|
vm_object_set_flag(object, OBJ_UMTXDEAD);
|
|
VM_OBJECT_WUNLOCK(object);
|
|
}
|
|
mtx_lock(&umtx_shm_lock);
|
|
dofree = umtx_shm_unref_reg_locked(reg, force);
|
|
mtx_unlock(&umtx_shm_lock);
|
|
if (dofree)
|
|
umtx_shm_free_reg(reg);
|
|
}
|
|
|
|
void
|
|
umtx_shm_object_init(vm_object_t object)
|
|
{
|
|
|
|
LIST_INIT(USHM_OBJ_UMTX(object));
|
|
}
|
|
|
|
void
|
|
umtx_shm_object_terminated(vm_object_t object)
|
|
{
|
|
struct umtx_shm_reg *reg, *reg1;
|
|
bool dofree;
|
|
|
|
if (LIST_EMPTY(USHM_OBJ_UMTX(object)))
|
|
return;
|
|
|
|
dofree = false;
|
|
mtx_lock(&umtx_shm_lock);
|
|
LIST_FOREACH_SAFE(reg, USHM_OBJ_UMTX(object), ushm_obj_link, reg1) {
|
|
if (umtx_shm_unref_reg_locked(reg, true)) {
|
|
TAILQ_INSERT_TAIL(&umtx_shm_reg_delfree, reg,
|
|
ushm_reg_link);
|
|
dofree = true;
|
|
}
|
|
}
|
|
mtx_unlock(&umtx_shm_lock);
|
|
if (dofree)
|
|
taskqueue_enqueue(taskqueue_thread, &umtx_shm_reg_delfree_task);
|
|
}
|
|
|
|
static int
|
|
umtx_shm_create_reg(struct thread *td, const struct umtx_key *key,
|
|
struct umtx_shm_reg **res)
|
|
{
|
|
struct umtx_shm_reg *reg, *reg1;
|
|
struct ucred *cred;
|
|
int error;
|
|
|
|
reg = umtx_shm_find_reg(key);
|
|
if (reg != NULL) {
|
|
*res = reg;
|
|
return (0);
|
|
}
|
|
cred = td->td_ucred;
|
|
if (!chgumtxcnt(cred->cr_ruidinfo, 1, lim_cur(td, RLIMIT_UMTXP)))
|
|
return (ENOMEM);
|
|
reg = uma_zalloc(umtx_shm_reg_zone, M_WAITOK | M_ZERO);
|
|
reg->ushm_refcnt = 1;
|
|
bcopy(key, ®->ushm_key, sizeof(*key));
|
|
reg->ushm_obj = shm_alloc(td->td_ucred, O_RDWR, false);
|
|
reg->ushm_cred = crhold(cred);
|
|
error = shm_dotruncate(reg->ushm_obj, PAGE_SIZE);
|
|
if (error != 0) {
|
|
umtx_shm_free_reg(reg);
|
|
return (error);
|
|
}
|
|
mtx_lock(&umtx_shm_lock);
|
|
reg1 = umtx_shm_find_reg_locked(key);
|
|
if (reg1 != NULL) {
|
|
mtx_unlock(&umtx_shm_lock);
|
|
umtx_shm_free_reg(reg);
|
|
*res = reg1;
|
|
return (0);
|
|
}
|
|
reg->ushm_refcnt++;
|
|
TAILQ_INSERT_TAIL(&umtx_shm_registry[key->hash], reg, ushm_reg_link);
|
|
LIST_INSERT_HEAD(USHM_OBJ_UMTX(key->info.shared.object), reg,
|
|
ushm_obj_link);
|
|
reg->ushm_flags = USHMF_REG_LINKED | USHMF_OBJ_LINKED;
|
|
mtx_unlock(&umtx_shm_lock);
|
|
*res = reg;
|
|
return (0);
|
|
}
|
|
|
|
static int
|
|
umtx_shm_alive(struct thread *td, void *addr)
|
|
{
|
|
vm_map_t map;
|
|
vm_map_entry_t entry;
|
|
vm_object_t object;
|
|
vm_pindex_t pindex;
|
|
vm_prot_t prot;
|
|
int res, ret;
|
|
boolean_t wired;
|
|
|
|
map = &td->td_proc->p_vmspace->vm_map;
|
|
res = vm_map_lookup(&map, (uintptr_t)addr, VM_PROT_READ, &entry,
|
|
&object, &pindex, &prot, &wired);
|
|
if (res != KERN_SUCCESS)
|
|
return (EFAULT);
|
|
if (object == NULL)
|
|
ret = EINVAL;
|
|
else
|
|
ret = (object->flags & OBJ_UMTXDEAD) != 0 ? ENOTTY : 0;
|
|
vm_map_lookup_done(map, entry);
|
|
return (ret);
|
|
}
|
|
|
|
static void
|
|
umtx_shm_init(void)
|
|
{
|
|
int i;
|
|
|
|
umtx_shm_reg_zone = uma_zcreate("umtx_shm", sizeof(struct umtx_shm_reg),
|
|
NULL, NULL, NULL, NULL, UMA_ALIGN_PTR, 0);
|
|
mtx_init(&umtx_shm_lock, "umtxshm", NULL, MTX_DEF);
|
|
for (i = 0; i < nitems(umtx_shm_registry); i++)
|
|
TAILQ_INIT(&umtx_shm_registry[i]);
|
|
}
|
|
|
|
static int
|
|
umtx_shm(struct thread *td, void *addr, u_int flags)
|
|
{
|
|
struct umtx_key key;
|
|
struct umtx_shm_reg *reg;
|
|
struct file *fp;
|
|
int error, fd;
|
|
|
|
if (__bitcount(flags & (UMTX_SHM_CREAT | UMTX_SHM_LOOKUP |
|
|
UMTX_SHM_DESTROY| UMTX_SHM_ALIVE)) != 1)
|
|
return (EINVAL);
|
|
if ((flags & UMTX_SHM_ALIVE) != 0)
|
|
return (umtx_shm_alive(td, addr));
|
|
error = umtx_key_get(addr, TYPE_SHM, PROCESS_SHARE, &key);
|
|
if (error != 0)
|
|
return (error);
|
|
KASSERT(key.shared == 1, ("non-shared key"));
|
|
if ((flags & UMTX_SHM_CREAT) != 0) {
|
|
error = umtx_shm_create_reg(td, &key, ®);
|
|
} else {
|
|
reg = umtx_shm_find_reg(&key);
|
|
if (reg == NULL)
|
|
error = ESRCH;
|
|
}
|
|
umtx_key_release(&key);
|
|
if (error != 0)
|
|
return (error);
|
|
KASSERT(reg != NULL, ("no reg"));
|
|
if ((flags & UMTX_SHM_DESTROY) != 0) {
|
|
umtx_shm_unref_reg(reg, true);
|
|
} else {
|
|
#if 0
|
|
#ifdef MAC
|
|
error = mac_posixshm_check_open(td->td_ucred,
|
|
reg->ushm_obj, FFLAGS(O_RDWR));
|
|
if (error == 0)
|
|
#endif
|
|
error = shm_access(reg->ushm_obj, td->td_ucred,
|
|
FFLAGS(O_RDWR));
|
|
if (error == 0)
|
|
#endif
|
|
error = falloc_caps(td, &fp, &fd, O_CLOEXEC, NULL);
|
|
if (error == 0) {
|
|
shm_hold(reg->ushm_obj);
|
|
finit(fp, FFLAGS(O_RDWR), DTYPE_SHM, reg->ushm_obj,
|
|
&shm_ops);
|
|
td->td_retval[0] = fd;
|
|
fdrop(fp, td);
|
|
}
|
|
}
|
|
umtx_shm_unref_reg(reg, false);
|
|
return (error);
|
|
}
|
|
|
|
static int
|
|
__umtx_op_shm(struct thread *td, struct _umtx_op_args *uap,
|
|
const struct umtx_copyops *ops __unused)
|
|
{
|
|
|
|
return (umtx_shm(td, uap->uaddr1, uap->val));
|
|
}
|
|
|
|
static int
|
|
__umtx_op_robust_lists(struct thread *td, struct _umtx_op_args *uap,
|
|
const struct umtx_copyops *ops)
|
|
{
|
|
struct umtx_robust_lists_params rb;
|
|
int error;
|
|
|
|
if (ops->compat32) {
|
|
if ((td->td_pflags2 & TDP2_COMPAT32RB) == 0 &&
|
|
(td->td_rb_list != 0 || td->td_rbp_list != 0 ||
|
|
td->td_rb_inact != 0))
|
|
return (EBUSY);
|
|
} else if ((td->td_pflags2 & TDP2_COMPAT32RB) != 0) {
|
|
return (EBUSY);
|
|
}
|
|
|
|
bzero(&rb, sizeof(rb));
|
|
error = ops->copyin_robust_lists(uap->uaddr1, uap->val, &rb);
|
|
if (error != 0)
|
|
return (error);
|
|
|
|
if (ops->compat32)
|
|
td->td_pflags2 |= TDP2_COMPAT32RB;
|
|
|
|
td->td_rb_list = rb.robust_list_offset;
|
|
td->td_rbp_list = rb.robust_priv_list_offset;
|
|
td->td_rb_inact = rb.robust_inact_offset;
|
|
return (0);
|
|
}
|
|
|
|
#if defined(__i386__) || defined(__amd64__)
|
|
/*
|
|
* Provide the standard 32-bit definitions for x86, since native/compat32 use a
|
|
* 32-bit time_t there. Other architectures just need the i386 definitions
|
|
* along with their standard compat32.
|
|
*/
|
|
struct timespecx32 {
|
|
int64_t tv_sec;
|
|
int32_t tv_nsec;
|
|
};
|
|
|
|
struct umtx_timex32 {
|
|
struct timespecx32 _timeout;
|
|
uint32_t _flags;
|
|
uint32_t _clockid;
|
|
};
|
|
|
|
#ifndef __i386__
|
|
#define timespeci386 timespec32
|
|
#define umtx_timei386 umtx_time32
|
|
#endif
|
|
#else /* !__i386__ && !__amd64__ */
|
|
/* 32-bit architectures can emulate i386, so define these almost everywhere. */
|
|
struct timespeci386 {
|
|
int32_t tv_sec;
|
|
int32_t tv_nsec;
|
|
};
|
|
|
|
struct umtx_timei386 {
|
|
struct timespeci386 _timeout;
|
|
uint32_t _flags;
|
|
uint32_t _clockid;
|
|
};
|
|
|
|
#if defined(__LP64__)
|
|
#define timespecx32 timespec32
|
|
#define umtx_timex32 umtx_time32
|
|
#endif
|
|
#endif
|
|
|
|
static int
|
|
umtx_copyin_robust_lists32(const void *uaddr, size_t size,
|
|
struct umtx_robust_lists_params *rbp)
|
|
{
|
|
struct umtx_robust_lists_params_compat32 rb32;
|
|
int error;
|
|
|
|
if (size > sizeof(rb32))
|
|
return (EINVAL);
|
|
bzero(&rb32, sizeof(rb32));
|
|
error = copyin(uaddr, &rb32, size);
|
|
if (error != 0)
|
|
return (error);
|
|
CP(rb32, *rbp, robust_list_offset);
|
|
CP(rb32, *rbp, robust_priv_list_offset);
|
|
CP(rb32, *rbp, robust_inact_offset);
|
|
return (0);
|
|
}
|
|
|
|
#ifndef __i386__
|
|
static inline int
|
|
umtx_copyin_timeouti386(const void *uaddr, struct timespec *tsp)
|
|
{
|
|
struct timespeci386 ts32;
|
|
int error;
|
|
|
|
error = copyin(uaddr, &ts32, sizeof(ts32));
|
|
if (error == 0) {
|
|
if (!timespecvalid_interval(&ts32))
|
|
error = EINVAL;
|
|
else {
|
|
CP(ts32, *tsp, tv_sec);
|
|
CP(ts32, *tsp, tv_nsec);
|
|
}
|
|
}
|
|
return (error);
|
|
}
|
|
|
|
static inline int
|
|
umtx_copyin_umtx_timei386(const void *uaddr, size_t size, struct _umtx_time *tp)
|
|
{
|
|
struct umtx_timei386 t32;
|
|
int error;
|
|
|
|
t32._clockid = CLOCK_REALTIME;
|
|
t32._flags = 0;
|
|
if (size <= sizeof(t32._timeout))
|
|
error = copyin(uaddr, &t32._timeout, sizeof(t32._timeout));
|
|
else
|
|
error = copyin(uaddr, &t32, sizeof(t32));
|
|
if (error != 0)
|
|
return (error);
|
|
if (!timespecvalid_interval(&t32._timeout))
|
|
return (EINVAL);
|
|
TS_CP(t32, *tp, _timeout);
|
|
CP(t32, *tp, _flags);
|
|
CP(t32, *tp, _clockid);
|
|
return (0);
|
|
}
|
|
|
|
static int
|
|
umtx_copyout_timeouti386(void *uaddr, size_t sz, struct timespec *tsp)
|
|
{
|
|
struct timespeci386 remain32 = {
|
|
.tv_sec = tsp->tv_sec,
|
|
.tv_nsec = tsp->tv_nsec,
|
|
};
|
|
|
|
/*
|
|
* Should be guaranteed by the caller, sz == uaddr1 - sizeof(_umtx_time)
|
|
* and we're only called if sz >= sizeof(timespec) as supplied in the
|
|
* copyops.
|
|
*/
|
|
KASSERT(sz >= sizeof(remain32),
|
|
("umtx_copyops specifies incorrect sizes"));
|
|
|
|
return (copyout(&remain32, uaddr, sizeof(remain32)));
|
|
}
|
|
#endif /* !__i386__ */
|
|
|
|
#if defined(__i386__) || defined(__LP64__)
|
|
static inline int
|
|
umtx_copyin_timeoutx32(const void *uaddr, struct timespec *tsp)
|
|
{
|
|
struct timespecx32 ts32;
|
|
int error;
|
|
|
|
error = copyin(uaddr, &ts32, sizeof(ts32));
|
|
if (error == 0) {
|
|
if (!timespecvalid_interval(&ts32))
|
|
error = EINVAL;
|
|
else {
|
|
CP(ts32, *tsp, tv_sec);
|
|
CP(ts32, *tsp, tv_nsec);
|
|
}
|
|
}
|
|
return (error);
|
|
}
|
|
|
|
static inline int
|
|
umtx_copyin_umtx_timex32(const void *uaddr, size_t size, struct _umtx_time *tp)
|
|
{
|
|
struct umtx_timex32 t32;
|
|
int error;
|
|
|
|
t32._clockid = CLOCK_REALTIME;
|
|
t32._flags = 0;
|
|
if (size <= sizeof(t32._timeout))
|
|
error = copyin(uaddr, &t32._timeout, sizeof(t32._timeout));
|
|
else
|
|
error = copyin(uaddr, &t32, sizeof(t32));
|
|
if (error != 0)
|
|
return (error);
|
|
if (!timespecvalid_interval(&t32._timeout))
|
|
return (EINVAL);
|
|
TS_CP(t32, *tp, _timeout);
|
|
CP(t32, *tp, _flags);
|
|
CP(t32, *tp, _clockid);
|
|
return (0);
|
|
}
|
|
|
|
static int
|
|
umtx_copyout_timeoutx32(void *uaddr, size_t sz, struct timespec *tsp)
|
|
{
|
|
struct timespecx32 remain32 = {
|
|
.tv_sec = tsp->tv_sec,
|
|
.tv_nsec = tsp->tv_nsec,
|
|
};
|
|
|
|
/*
|
|
* Should be guaranteed by the caller, sz == uaddr1 - sizeof(_umtx_time)
|
|
* and we're only called if sz >= sizeof(timespec) as supplied in the
|
|
* copyops.
|
|
*/
|
|
KASSERT(sz >= sizeof(remain32),
|
|
("umtx_copyops specifies incorrect sizes"));
|
|
|
|
return (copyout(&remain32, uaddr, sizeof(remain32)));
|
|
}
|
|
#endif /* __i386__ || __LP64__ */
|
|
|
|
typedef int (*_umtx_op_func)(struct thread *td, struct _umtx_op_args *uap,
|
|
const struct umtx_copyops *umtx_ops);
|
|
|
|
static const _umtx_op_func op_table[] = {
|
|
#ifdef COMPAT_FREEBSD10
|
|
[UMTX_OP_LOCK] = __umtx_op_lock_umtx,
|
|
[UMTX_OP_UNLOCK] = __umtx_op_unlock_umtx,
|
|
#else
|
|
[UMTX_OP_LOCK] = __umtx_op_unimpl,
|
|
[UMTX_OP_UNLOCK] = __umtx_op_unimpl,
|
|
#endif
|
|
[UMTX_OP_WAIT] = __umtx_op_wait,
|
|
[UMTX_OP_WAKE] = __umtx_op_wake,
|
|
[UMTX_OP_MUTEX_TRYLOCK] = __umtx_op_trylock_umutex,
|
|
[UMTX_OP_MUTEX_LOCK] = __umtx_op_lock_umutex,
|
|
[UMTX_OP_MUTEX_UNLOCK] = __umtx_op_unlock_umutex,
|
|
[UMTX_OP_SET_CEILING] = __umtx_op_set_ceiling,
|
|
[UMTX_OP_CV_WAIT] = __umtx_op_cv_wait,
|
|
[UMTX_OP_CV_SIGNAL] = __umtx_op_cv_signal,
|
|
[UMTX_OP_CV_BROADCAST] = __umtx_op_cv_broadcast,
|
|
[UMTX_OP_WAIT_UINT] = __umtx_op_wait_uint,
|
|
[UMTX_OP_RW_RDLOCK] = __umtx_op_rw_rdlock,
|
|
[UMTX_OP_RW_WRLOCK] = __umtx_op_rw_wrlock,
|
|
[UMTX_OP_RW_UNLOCK] = __umtx_op_rw_unlock,
|
|
[UMTX_OP_WAIT_UINT_PRIVATE] = __umtx_op_wait_uint_private,
|
|
[UMTX_OP_WAKE_PRIVATE] = __umtx_op_wake_private,
|
|
[UMTX_OP_MUTEX_WAIT] = __umtx_op_wait_umutex,
|
|
[UMTX_OP_MUTEX_WAKE] = __umtx_op_wake_umutex,
|
|
#if defined(COMPAT_FREEBSD9) || defined(COMPAT_FREEBSD10)
|
|
[UMTX_OP_SEM_WAIT] = __umtx_op_sem_wait,
|
|
[UMTX_OP_SEM_WAKE] = __umtx_op_sem_wake,
|
|
#else
|
|
[UMTX_OP_SEM_WAIT] = __umtx_op_unimpl,
|
|
[UMTX_OP_SEM_WAKE] = __umtx_op_unimpl,
|
|
#endif
|
|
[UMTX_OP_NWAKE_PRIVATE] = __umtx_op_nwake_private,
|
|
[UMTX_OP_MUTEX_WAKE2] = __umtx_op_wake2_umutex,
|
|
[UMTX_OP_SEM2_WAIT] = __umtx_op_sem2_wait,
|
|
[UMTX_OP_SEM2_WAKE] = __umtx_op_sem2_wake,
|
|
[UMTX_OP_SHM] = __umtx_op_shm,
|
|
[UMTX_OP_ROBUST_LISTS] = __umtx_op_robust_lists,
|
|
};
|
|
|
|
static const struct umtx_copyops umtx_native_ops = {
|
|
.copyin_timeout = umtx_copyin_timeout,
|
|
.copyin_umtx_time = umtx_copyin_umtx_time,
|
|
.copyin_robust_lists = umtx_copyin_robust_lists,
|
|
.copyout_timeout = umtx_copyout_timeout,
|
|
.timespec_sz = sizeof(struct timespec),
|
|
.umtx_time_sz = sizeof(struct _umtx_time),
|
|
};
|
|
|
|
#ifndef __i386__
|
|
static const struct umtx_copyops umtx_native_opsi386 = {
|
|
.copyin_timeout = umtx_copyin_timeouti386,
|
|
.copyin_umtx_time = umtx_copyin_umtx_timei386,
|
|
.copyin_robust_lists = umtx_copyin_robust_lists32,
|
|
.copyout_timeout = umtx_copyout_timeouti386,
|
|
.timespec_sz = sizeof(struct timespeci386),
|
|
.umtx_time_sz = sizeof(struct umtx_timei386),
|
|
.compat32 = true,
|
|
};
|
|
#endif
|
|
|
|
#if defined(__i386__) || defined(__LP64__)
|
|
/* i386 can emulate other 32-bit archs, too! */
|
|
static const struct umtx_copyops umtx_native_opsx32 = {
|
|
.copyin_timeout = umtx_copyin_timeoutx32,
|
|
.copyin_umtx_time = umtx_copyin_umtx_timex32,
|
|
.copyin_robust_lists = umtx_copyin_robust_lists32,
|
|
.copyout_timeout = umtx_copyout_timeoutx32,
|
|
.timespec_sz = sizeof(struct timespecx32),
|
|
.umtx_time_sz = sizeof(struct umtx_timex32),
|
|
.compat32 = true,
|
|
};
|
|
|
|
#ifdef COMPAT_FREEBSD32
|
|
#ifdef __amd64__
|
|
#define umtx_native_ops32 umtx_native_opsi386
|
|
#else
|
|
#define umtx_native_ops32 umtx_native_opsx32
|
|
#endif
|
|
#endif /* COMPAT_FREEBSD32 */
|
|
#endif /* __i386__ || __LP64__ */
|
|
|
|
#define UMTX_OP__FLAGS (UMTX_OP__32BIT | UMTX_OP__I386)
|
|
|
|
static int
|
|
kern__umtx_op(struct thread *td, void *obj, int op, unsigned long val,
|
|
void *uaddr1, void *uaddr2, const struct umtx_copyops *ops)
|
|
{
|
|
struct _umtx_op_args uap = {
|
|
.obj = obj,
|
|
.op = op & ~UMTX_OP__FLAGS,
|
|
.val = val,
|
|
.uaddr1 = uaddr1,
|
|
.uaddr2 = uaddr2
|
|
};
|
|
|
|
if ((uap.op >= nitems(op_table)))
|
|
return (EINVAL);
|
|
return ((*op_table[uap.op])(td, &uap, ops));
|
|
}
|
|
|
|
int
|
|
sys__umtx_op(struct thread *td, struct _umtx_op_args *uap)
|
|
{
|
|
static const struct umtx_copyops *umtx_ops;
|
|
|
|
umtx_ops = &umtx_native_ops;
|
|
#ifdef __LP64__
|
|
if ((uap->op & (UMTX_OP__32BIT | UMTX_OP__I386)) != 0) {
|
|
if ((uap->op & UMTX_OP__I386) != 0)
|
|
umtx_ops = &umtx_native_opsi386;
|
|
else
|
|
umtx_ops = &umtx_native_opsx32;
|
|
}
|
|
#elif !defined(__i386__)
|
|
/* We consider UMTX_OP__32BIT a nop on !i386 ILP32. */
|
|
if ((uap->op & UMTX_OP__I386) != 0)
|
|
umtx_ops = &umtx_native_opsi386;
|
|
#else
|
|
/* Likewise, UMTX_OP__I386 is a nop on i386. */
|
|
if ((uap->op & UMTX_OP__32BIT) != 0)
|
|
umtx_ops = &umtx_native_opsx32;
|
|
#endif
|
|
return (kern__umtx_op(td, uap->obj, uap->op, uap->val, uap->uaddr1,
|
|
uap->uaddr2, umtx_ops));
|
|
}
|
|
|
|
#ifdef COMPAT_FREEBSD32
|
|
#ifdef COMPAT_FREEBSD10
|
|
int
|
|
freebsd10_freebsd32__umtx_lock(struct thread *td,
|
|
struct freebsd10_freebsd32__umtx_lock_args *uap)
|
|
{
|
|
return (do_lock_umtx32(td, (uint32_t *)uap->umtx, td->td_tid, NULL));
|
|
}
|
|
|
|
int
|
|
freebsd10_freebsd32__umtx_unlock(struct thread *td,
|
|
struct freebsd10_freebsd32__umtx_unlock_args *uap)
|
|
{
|
|
return (do_unlock_umtx32(td, (uint32_t *)uap->umtx, td->td_tid));
|
|
}
|
|
#endif /* COMPAT_FREEBSD10 */
|
|
|
|
int
|
|
freebsd32__umtx_op(struct thread *td, struct freebsd32__umtx_op_args *uap)
|
|
{
|
|
|
|
return (kern__umtx_op(td, uap->obj, uap->op, uap->val, uap->uaddr1,
|
|
uap->uaddr2, &umtx_native_ops32));
|
|
}
|
|
#endif /* COMPAT_FREEBSD32 */
|
|
|
|
void
|
|
umtx_thread_init(struct thread *td)
|
|
{
|
|
|
|
td->td_umtxq = umtxq_alloc();
|
|
td->td_umtxq->uq_thread = td;
|
|
}
|
|
|
|
void
|
|
umtx_thread_fini(struct thread *td)
|
|
{
|
|
|
|
umtxq_free(td->td_umtxq);
|
|
}
|
|
|
|
/*
|
|
* It will be called when new thread is created, e.g fork().
|
|
*/
|
|
void
|
|
umtx_thread_alloc(struct thread *td)
|
|
{
|
|
struct umtx_q *uq;
|
|
|
|
uq = td->td_umtxq;
|
|
uq->uq_inherited_pri = PRI_MAX;
|
|
|
|
KASSERT(uq->uq_flags == 0, ("uq_flags != 0"));
|
|
KASSERT(uq->uq_thread == td, ("uq_thread != td"));
|
|
KASSERT(uq->uq_pi_blocked == NULL, ("uq_pi_blocked != NULL"));
|
|
KASSERT(TAILQ_EMPTY(&uq->uq_pi_contested), ("uq_pi_contested is not empty"));
|
|
}
|
|
|
|
/*
|
|
* exec() hook.
|
|
*
|
|
* Clear robust lists for all process' threads, not delaying the
|
|
* cleanup to thread exit, since the relevant address space is
|
|
* destroyed right now.
|
|
*/
|
|
void
|
|
umtx_exec(struct proc *p)
|
|
{
|
|
struct thread *td;
|
|
|
|
KASSERT(p == curproc, ("need curproc"));
|
|
KASSERT((p->p_flag & P_HADTHREADS) == 0 ||
|
|
(p->p_flag & P_STOPPED_SINGLE) != 0,
|
|
("curproc must be single-threaded"));
|
|
/*
|
|
* There is no need to lock the list as only this thread can be
|
|
* running.
|
|
*/
|
|
FOREACH_THREAD_IN_PROC(p, td) {
|
|
KASSERT(td == curthread ||
|
|
((td->td_flags & TDF_BOUNDARY) != 0 && TD_IS_SUSPENDED(td)),
|
|
("running thread %p %p", p, td));
|
|
umtx_thread_cleanup(td);
|
|
td->td_rb_list = td->td_rbp_list = td->td_rb_inact = 0;
|
|
}
|
|
}
|
|
|
|
/*
|
|
* thread exit hook.
|
|
*/
|
|
void
|
|
umtx_thread_exit(struct thread *td)
|
|
{
|
|
|
|
umtx_thread_cleanup(td);
|
|
}
|
|
|
|
static int
|
|
umtx_read_uptr(struct thread *td, uintptr_t ptr, uintptr_t *res, bool compat32)
|
|
{
|
|
u_long res1;
|
|
uint32_t res32;
|
|
int error;
|
|
|
|
if (compat32) {
|
|
error = fueword32((void *)ptr, &res32);
|
|
if (error == 0)
|
|
res1 = res32;
|
|
} else {
|
|
error = fueword((void *)ptr, &res1);
|
|
}
|
|
if (error == 0)
|
|
*res = res1;
|
|
else
|
|
error = EFAULT;
|
|
return (error);
|
|
}
|
|
|
|
static void
|
|
umtx_read_rb_list(struct thread *td, struct umutex *m, uintptr_t *rb_list,
|
|
bool compat32)
|
|
{
|
|
struct umutex32 m32;
|
|
|
|
if (compat32) {
|
|
memcpy(&m32, m, sizeof(m32));
|
|
*rb_list = m32.m_rb_lnk;
|
|
} else {
|
|
*rb_list = m->m_rb_lnk;
|
|
}
|
|
}
|
|
|
|
static int
|
|
umtx_handle_rb(struct thread *td, uintptr_t rbp, uintptr_t *rb_list, bool inact,
|
|
bool compat32)
|
|
{
|
|
struct umutex m;
|
|
int error;
|
|
|
|
KASSERT(td->td_proc == curproc, ("need current vmspace"));
|
|
error = copyin((void *)rbp, &m, sizeof(m));
|
|
if (error != 0)
|
|
return (error);
|
|
if (rb_list != NULL)
|
|
umtx_read_rb_list(td, &m, rb_list, compat32);
|
|
if ((m.m_flags & UMUTEX_ROBUST) == 0)
|
|
return (EINVAL);
|
|
if ((m.m_owner & ~UMUTEX_CONTESTED) != td->td_tid)
|
|
/* inact is cleared after unlock, allow the inconsistency */
|
|
return (inact ? 0 : EINVAL);
|
|
return (do_unlock_umutex(td, (struct umutex *)rbp, true));
|
|
}
|
|
|
|
static void
|
|
umtx_cleanup_rb_list(struct thread *td, uintptr_t rb_list, uintptr_t *rb_inact,
|
|
const char *name, bool compat32)
|
|
{
|
|
int error, i;
|
|
uintptr_t rbp;
|
|
bool inact;
|
|
|
|
if (rb_list == 0)
|
|
return;
|
|
error = umtx_read_uptr(td, rb_list, &rbp, compat32);
|
|
for (i = 0; error == 0 && rbp != 0 && i < umtx_max_rb; i++) {
|
|
if (rbp == *rb_inact) {
|
|
inact = true;
|
|
*rb_inact = 0;
|
|
} else
|
|
inact = false;
|
|
error = umtx_handle_rb(td, rbp, &rbp, inact, compat32);
|
|
}
|
|
if (i == umtx_max_rb && umtx_verbose_rb) {
|
|
uprintf("comm %s pid %d: reached umtx %smax rb %d\n",
|
|
td->td_proc->p_comm, td->td_proc->p_pid, name, umtx_max_rb);
|
|
}
|
|
if (error != 0 && umtx_verbose_rb) {
|
|
uprintf("comm %s pid %d: handling %srb error %d\n",
|
|
td->td_proc->p_comm, td->td_proc->p_pid, name, error);
|
|
}
|
|
}
|
|
|
|
/*
|
|
* Clean up umtx data.
|
|
*/
|
|
static void
|
|
umtx_thread_cleanup(struct thread *td)
|
|
{
|
|
struct umtx_q *uq;
|
|
struct umtx_pi *pi;
|
|
uintptr_t rb_inact;
|
|
bool compat32;
|
|
|
|
/*
|
|
* Disown pi mutexes.
|
|
*/
|
|
uq = td->td_umtxq;
|
|
if (uq != NULL) {
|
|
if (uq->uq_inherited_pri != PRI_MAX ||
|
|
!TAILQ_EMPTY(&uq->uq_pi_contested)) {
|
|
mtx_lock(&umtx_lock);
|
|
uq->uq_inherited_pri = PRI_MAX;
|
|
while ((pi = TAILQ_FIRST(&uq->uq_pi_contested)) != NULL) {
|
|
pi->pi_owner = NULL;
|
|
TAILQ_REMOVE(&uq->uq_pi_contested, pi, pi_link);
|
|
}
|
|
mtx_unlock(&umtx_lock);
|
|
}
|
|
sched_lend_user_prio_cond(td, PRI_MAX);
|
|
}
|
|
|
|
compat32 = (td->td_pflags2 & TDP2_COMPAT32RB) != 0;
|
|
td->td_pflags2 &= ~TDP2_COMPAT32RB;
|
|
|
|
if (td->td_rb_inact == 0 && td->td_rb_list == 0 && td->td_rbp_list == 0)
|
|
return;
|
|
|
|
/*
|
|
* Handle terminated robust mutexes. Must be done after
|
|
* robust pi disown, otherwise unlock could see unowned
|
|
* entries.
|
|
*/
|
|
rb_inact = td->td_rb_inact;
|
|
if (rb_inact != 0)
|
|
(void)umtx_read_uptr(td, rb_inact, &rb_inact, compat32);
|
|
umtx_cleanup_rb_list(td, td->td_rb_list, &rb_inact, "", compat32);
|
|
umtx_cleanup_rb_list(td, td->td_rbp_list, &rb_inact, "priv ", compat32);
|
|
if (rb_inact != 0)
|
|
(void)umtx_handle_rb(td, rb_inact, NULL, true, compat32);
|
|
}
|