472 lines
16 KiB
C
472 lines
16 KiB
C
/*-
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* Copyright (c) 1997 Berkeley Software Design, Inc. All rights reserved.
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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, this list of conditions and the following 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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* 3. Berkeley Software Design Inc's name may not be used to endorse or
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* promote products derived from this software without specific prior
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* written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY BERKELEY SOFTWARE DESIGN INC ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL BERKELEY SOFTWARE DESIGN INC BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*
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* from BSDI $Id: mutex.h,v 2.7.2.35 2000/04/27 03:10:26 cp Exp $
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* $FreeBSD$
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*/
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#ifndef _SYS_MUTEX_H_
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#define _SYS_MUTEX_H_
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#include <sys/queue.h>
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#include <sys/_lock.h>
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#include <sys/_mutex.h>
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#ifdef _KERNEL
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#include <sys/pcpu.h>
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#include <sys/lock_profile.h>
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#include <sys/lockstat.h>
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#include <machine/atomic.h>
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#include <machine/cpufunc.h>
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/*
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* Mutex types and options passed to mtx_init(). MTX_QUIET and MTX_DUPOK
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* can also be passed in.
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*/
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#define MTX_DEF 0x00000000 /* DEFAULT (sleep) lock */
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#define MTX_SPIN 0x00000001 /* Spin lock (disables interrupts) */
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#define MTX_RECURSE 0x00000004 /* Option: lock allowed to recurse */
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#define MTX_NOWITNESS 0x00000008 /* Don't do any witness checking. */
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#define MTX_NOPROFILE 0x00000020 /* Don't profile this lock */
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/*
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* Option flags passed to certain lock/unlock routines, through the use
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* of corresponding mtx_{lock,unlock}_flags() interface macros.
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*/
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#define MTX_QUIET LOP_QUIET /* Don't log a mutex event */
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#define MTX_DUPOK LOP_DUPOK /* Don't log a duplicate acquire */
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/*
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* State bits kept in mutex->mtx_lock, for the DEFAULT lock type. None of this,
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* with the exception of MTX_UNOWNED, applies to spin locks.
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*/
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#define MTX_RECURSED 0x00000001 /* lock recursed (for MTX_DEF only) */
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#define MTX_CONTESTED 0x00000002 /* lock contested (for MTX_DEF only) */
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#define MTX_UNOWNED 0x00000004 /* Cookie for free mutex */
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#define MTX_FLAGMASK (MTX_RECURSED | MTX_CONTESTED | MTX_UNOWNED)
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/*
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* Value stored in mutex->mtx_lock to denote a destroyed mutex.
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*/
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#define MTX_DESTROYED (MTX_CONTESTED | MTX_UNOWNED)
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/*
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* Prototypes
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*
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* NOTE: Functions prepended with `_' (underscore) are exported to other parts
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* of the kernel via macros, thus allowing us to use the cpp LOCK_FILE
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* and LOCK_LINE or for hiding the lock cookie crunching to the
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* consumers. These functions should not be called directly by any
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* code using the API. Their macros cover their functionality.
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* Functions with a `_' suffix are the entrypoint for the common
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* KPI covering both compat shims and fast path case. These can be
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* used by consumers willing to pass options, file and line
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* informations, in an option-independent way.
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*
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* [See below for descriptions]
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*
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*/
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void _mtx_init(volatile uintptr_t *c, const char *name, const char *type,
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int opts);
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void _mtx_destroy(volatile uintptr_t *c);
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void mtx_sysinit(void *arg);
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int _mtx_trylock_flags_(volatile uintptr_t *c, int opts, const char *file,
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int line);
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void mutex_init(void);
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void __mtx_lock_sleep(volatile uintptr_t *c, uintptr_t tid, int opts,
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const char *file, int line);
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void __mtx_unlock_sleep(volatile uintptr_t *c, int opts, const char *file,
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int line);
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#ifdef SMP
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void _mtx_lock_spin_cookie(volatile uintptr_t *c, uintptr_t tid, int opts,
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const char *file, int line);
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#endif
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void __mtx_lock_flags(volatile uintptr_t *c, int opts, const char *file,
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int line);
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void __mtx_unlock_flags(volatile uintptr_t *c, int opts, const char *file,
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int line);
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void __mtx_lock_spin_flags(volatile uintptr_t *c, int opts, const char *file,
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int line);
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void __mtx_unlock_spin_flags(volatile uintptr_t *c, int opts,
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const char *file, int line);
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#if defined(INVARIANTS) || defined(INVARIANT_SUPPORT)
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void __mtx_assert(const volatile uintptr_t *c, int what, const char *file,
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int line);
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#endif
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void thread_lock_flags_(struct thread *, int, const char *, int);
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#define thread_lock(tdp) \
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thread_lock_flags_((tdp), 0, __FILE__, __LINE__)
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#define thread_lock_flags(tdp, opt) \
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thread_lock_flags_((tdp), (opt), __FILE__, __LINE__)
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#define thread_unlock(tdp) \
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mtx_unlock_spin((tdp)->td_lock)
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/*
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* Top-level macros to provide lock cookie once the actual mtx is passed.
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* They will also prevent passing a malformed object to the mtx KPI by
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* failing compilation as the mtx_lock reserved member will not be found.
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*/
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#define mtx_init(m, n, t, o) \
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_mtx_init(&(m)->mtx_lock, n, t, o)
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#define mtx_destroy(m) \
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_mtx_destroy(&(m)->mtx_lock)
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#define mtx_trylock_flags_(m, o, f, l) \
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_mtx_trylock_flags_(&(m)->mtx_lock, o, f, l)
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#define _mtx_lock_sleep(m, t, o, f, l) \
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__mtx_lock_sleep(&(m)->mtx_lock, t, o, f, l)
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#define _mtx_unlock_sleep(m, o, f, l) \
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__mtx_unlock_sleep(&(m)->mtx_lock, o, f, l)
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#ifdef SMP
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#define _mtx_lock_spin(m, t, o, f, l) \
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_mtx_lock_spin_cookie(&(m)->mtx_lock, t, o, f, l)
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#endif
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#define _mtx_lock_flags(m, o, f, l) \
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__mtx_lock_flags(&(m)->mtx_lock, o, f, l)
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#define _mtx_unlock_flags(m, o, f, l) \
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__mtx_unlock_flags(&(m)->mtx_lock, o, f, l)
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#define _mtx_lock_spin_flags(m, o, f, l) \
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__mtx_lock_spin_flags(&(m)->mtx_lock, o, f, l)
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#define _mtx_unlock_spin_flags(m, o, f, l) \
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__mtx_unlock_spin_flags(&(m)->mtx_lock, o, f, l)
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#if defined(INVARIANTS) || defined(INVARIANT_SUPPORT)
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#define _mtx_assert(m, w, f, l) \
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__mtx_assert(&(m)->mtx_lock, w, f, l)
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#endif
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#define mtx_recurse lock_object.lo_data
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/* Very simple operations on mtx_lock. */
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/* Try to obtain mtx_lock once. */
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#define _mtx_obtain_lock(mp, tid) \
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atomic_cmpset_acq_ptr(&(mp)->mtx_lock, MTX_UNOWNED, (tid))
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/* Try to release mtx_lock if it is unrecursed and uncontested. */
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#define _mtx_release_lock(mp, tid) \
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atomic_cmpset_rel_ptr(&(mp)->mtx_lock, (tid), MTX_UNOWNED)
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/* Release mtx_lock quickly, assuming we own it. */
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#define _mtx_release_lock_quick(mp) \
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atomic_store_rel_ptr(&(mp)->mtx_lock, MTX_UNOWNED)
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/*
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* Full lock operations that are suitable to be inlined in non-debug
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* kernels. If the lock cannot be acquired or released trivially then
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* the work is deferred to another function.
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*/
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/* Lock a normal mutex. */
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#define __mtx_lock(mp, tid, opts, file, line) do { \
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uintptr_t _tid = (uintptr_t)(tid); \
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\
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if (!_mtx_obtain_lock((mp), _tid)) \
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_mtx_lock_sleep((mp), _tid, (opts), (file), (line)); \
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else \
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LOCKSTAT_PROFILE_OBTAIN_LOCK_SUCCESS(LS_MTX_LOCK_ACQUIRE, \
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mp, 0, 0, (file), (line)); \
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} while (0)
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/*
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* Lock a spin mutex. For spinlocks, we handle recursion inline (it
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* turns out that function calls can be significantly expensive on
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* some architectures). Since spin locks are not _too_ common,
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* inlining this code is not too big a deal.
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*/
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#ifdef SMP
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#define __mtx_lock_spin(mp, tid, opts, file, line) do { \
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uintptr_t _tid = (uintptr_t)(tid); \
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\
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spinlock_enter(); \
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if (!_mtx_obtain_lock((mp), _tid)) { \
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if ((mp)->mtx_lock == _tid) \
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(mp)->mtx_recurse++; \
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else \
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_mtx_lock_spin((mp), _tid, (opts), (file), (line)); \
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} else \
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LOCKSTAT_PROFILE_OBTAIN_LOCK_SUCCESS(LS_MTX_SPIN_LOCK_ACQUIRE, \
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mp, 0, 0, (file), (line)); \
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} while (0)
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#else /* SMP */
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#define __mtx_lock_spin(mp, tid, opts, file, line) do { \
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uintptr_t _tid = (uintptr_t)(tid); \
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\
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spinlock_enter(); \
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if ((mp)->mtx_lock == _tid) \
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(mp)->mtx_recurse++; \
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else { \
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KASSERT((mp)->mtx_lock == MTX_UNOWNED, ("corrupt spinlock")); \
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(mp)->mtx_lock = _tid; \
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} \
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} while (0)
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#endif /* SMP */
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/* Unlock a normal mutex. */
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#define __mtx_unlock(mp, tid, opts, file, line) do { \
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uintptr_t _tid = (uintptr_t)(tid); \
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\
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if (!_mtx_release_lock((mp), _tid)) \
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_mtx_unlock_sleep((mp), (opts), (file), (line)); \
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} while (0)
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/*
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* Unlock a spin mutex. For spinlocks, we can handle everything
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* inline, as it's pretty simple and a function call would be too
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* expensive (at least on some architectures). Since spin locks are
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* not _too_ common, inlining this code is not too big a deal.
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*
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* Since we always perform a spinlock_enter() when attempting to acquire a
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* spin lock, we need to always perform a matching spinlock_exit() when
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* releasing a spin lock. This includes the recursion cases.
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*/
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#ifdef SMP
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#define __mtx_unlock_spin(mp) do { \
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if (mtx_recursed((mp))) \
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(mp)->mtx_recurse--; \
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else { \
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LOCKSTAT_PROFILE_RELEASE_LOCK(LS_MTX_SPIN_UNLOCK_RELEASE, \
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mp); \
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_mtx_release_lock_quick((mp)); \
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} \
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spinlock_exit(); \
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} while (0)
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#else /* SMP */
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#define __mtx_unlock_spin(mp) do { \
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if (mtx_recursed((mp))) \
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(mp)->mtx_recurse--; \
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else { \
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LOCKSTAT_PROFILE_RELEASE_LOCK(LS_MTX_SPIN_UNLOCK_RELEASE, \
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mp); \
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(mp)->mtx_lock = MTX_UNOWNED; \
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} \
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spinlock_exit(); \
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} while (0)
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#endif /* SMP */
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/*
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* Exported lock manipulation interface.
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*
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* mtx_lock(m) locks MTX_DEF mutex `m'
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*
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* mtx_lock_spin(m) locks MTX_SPIN mutex `m'
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*
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* mtx_unlock(m) unlocks MTX_DEF mutex `m'
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*
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* mtx_unlock_spin(m) unlocks MTX_SPIN mutex `m'
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*
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* mtx_lock_spin_flags(m, opts) and mtx_lock_flags(m, opts) locks mutex `m'
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* and passes option flags `opts' to the "hard" function, if required.
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* With these routines, it is possible to pass flags such as MTX_QUIET
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* to the appropriate lock manipulation routines.
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*
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* mtx_trylock(m) attempts to acquire MTX_DEF mutex `m' but doesn't sleep if
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* it cannot. Rather, it returns 0 on failure and non-zero on success.
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* It does NOT handle recursion as we assume that if a caller is properly
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* using this part of the interface, he will know that the lock in question
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* is _not_ recursed.
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*
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* mtx_trylock_flags(m, opts) is used the same way as mtx_trylock() but accepts
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* relevant option flags `opts.'
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*
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* mtx_initialized(m) returns non-zero if the lock `m' has been initialized.
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*
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* mtx_owned(m) returns non-zero if the current thread owns the lock `m'
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*
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* mtx_recursed(m) returns non-zero if the lock `m' is presently recursed.
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*/
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#define mtx_lock(m) mtx_lock_flags((m), 0)
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#define mtx_lock_spin(m) mtx_lock_spin_flags((m), 0)
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#define mtx_trylock(m) mtx_trylock_flags((m), 0)
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#define mtx_unlock(m) mtx_unlock_flags((m), 0)
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#define mtx_unlock_spin(m) mtx_unlock_spin_flags((m), 0)
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struct mtx_pool;
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struct mtx_pool *mtx_pool_create(const char *mtx_name, int pool_size, int opts);
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void mtx_pool_destroy(struct mtx_pool **poolp);
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struct mtx *mtx_pool_find(struct mtx_pool *pool, void *ptr);
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struct mtx *mtx_pool_alloc(struct mtx_pool *pool);
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#define mtx_pool_lock(pool, ptr) \
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mtx_lock(mtx_pool_find((pool), (ptr)))
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#define mtx_pool_lock_spin(pool, ptr) \
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mtx_lock_spin(mtx_pool_find((pool), (ptr)))
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#define mtx_pool_unlock(pool, ptr) \
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mtx_unlock(mtx_pool_find((pool), (ptr)))
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#define mtx_pool_unlock_spin(pool, ptr) \
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mtx_unlock_spin(mtx_pool_find((pool), (ptr)))
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/*
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* mtxpool_lockbuilder is a pool of sleep locks that is not witness
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* checked and should only be used for building higher level locks.
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*
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* mtxpool_sleep is a general purpose pool of sleep mutexes.
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*/
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extern struct mtx_pool *mtxpool_lockbuilder;
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extern struct mtx_pool *mtxpool_sleep;
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#ifndef LOCK_DEBUG
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#error LOCK_DEBUG not defined, include <sys/lock.h> before <sys/mutex.h>
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#endif
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#if LOCK_DEBUG > 0 || defined(MUTEX_NOINLINE)
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#define mtx_lock_flags_(m, opts, file, line) \
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_mtx_lock_flags((m), (opts), (file), (line))
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#define mtx_unlock_flags_(m, opts, file, line) \
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_mtx_unlock_flags((m), (opts), (file), (line))
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#define mtx_lock_spin_flags_(m, opts, file, line) \
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_mtx_lock_spin_flags((m), (opts), (file), (line))
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#define mtx_unlock_spin_flags_(m, opts, file, line) \
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_mtx_unlock_spin_flags((m), (opts), (file), (line))
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#else /* LOCK_DEBUG == 0 && !MUTEX_NOINLINE */
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#define mtx_lock_flags_(m, opts, file, line) \
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__mtx_lock((m), curthread, (opts), (file), (line))
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#define mtx_unlock_flags_(m, opts, file, line) \
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__mtx_unlock((m), curthread, (opts), (file), (line))
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#define mtx_lock_spin_flags_(m, opts, file, line) \
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__mtx_lock_spin((m), curthread, (opts), (file), (line))
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#define mtx_unlock_spin_flags_(m, opts, file, line) \
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__mtx_unlock_spin((m))
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#endif /* LOCK_DEBUG > 0 || MUTEX_NOINLINE */
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#ifdef INVARIANTS
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#define mtx_assert_(m, what, file, line) \
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_mtx_assert((m), (what), (file), (line))
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#define GIANT_REQUIRED mtx_assert_(&Giant, MA_OWNED, __FILE__, __LINE__)
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#else /* INVARIANTS */
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#define mtx_assert_(m, what, file, line) (void)0
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#define GIANT_REQUIRED
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#endif /* INVARIANTS */
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#define mtx_lock_flags(m, opts) \
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mtx_lock_flags_((m), (opts), LOCK_FILE, LOCK_LINE)
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#define mtx_unlock_flags(m, opts) \
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mtx_unlock_flags_((m), (opts), LOCK_FILE, LOCK_LINE)
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#define mtx_lock_spin_flags(m, opts) \
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mtx_lock_spin_flags_((m), (opts), LOCK_FILE, LOCK_LINE)
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#define mtx_unlock_spin_flags(m, opts) \
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mtx_unlock_spin_flags_((m), (opts), LOCK_FILE, LOCK_LINE)
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#define mtx_trylock_flags(m, opts) \
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mtx_trylock_flags_((m), (opts), LOCK_FILE, LOCK_LINE)
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#define mtx_assert(m, what) \
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mtx_assert_((m), (what), __FILE__, __LINE__)
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#define mtx_sleep(chan, mtx, pri, wmesg, timo) \
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_sleep((chan), &(mtx)->lock_object, (pri), (wmesg), (timo))
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#define mtx_initialized(m) lock_initalized(&(m)->lock_object)
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#define mtx_owned(m) (((m)->mtx_lock & ~MTX_FLAGMASK) == (uintptr_t)curthread)
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#define mtx_recursed(m) ((m)->mtx_recurse != 0)
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#define mtx_name(m) ((m)->lock_object.lo_name)
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/*
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* Global locks.
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*/
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extern struct mtx Giant;
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extern struct mtx blocked_lock;
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/*
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* Giant lock manipulation and clean exit macros.
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* Used to replace return with an exit Giant and return.
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*
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* Note that DROP_GIANT*() needs to be paired with PICKUP_GIANT()
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* The #ifndef is to allow lint-like tools to redefine DROP_GIANT.
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*/
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#ifndef DROP_GIANT
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#define DROP_GIANT() \
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do { \
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int _giantcnt = 0; \
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WITNESS_SAVE_DECL(Giant); \
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\
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if (mtx_owned(&Giant)) { \
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WITNESS_SAVE(&Giant.lock_object, Giant); \
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for (_giantcnt = 0; mtx_owned(&Giant) && \
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!SCHEDULER_STOPPED(); _giantcnt++) \
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mtx_unlock(&Giant); \
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}
|
|
|
|
#define PICKUP_GIANT() \
|
|
PARTIAL_PICKUP_GIANT(); \
|
|
} while (0)
|
|
|
|
#define PARTIAL_PICKUP_GIANT() \
|
|
mtx_assert(&Giant, MA_NOTOWNED); \
|
|
if (_giantcnt > 0) { \
|
|
while (_giantcnt--) \
|
|
mtx_lock(&Giant); \
|
|
WITNESS_RESTORE(&Giant.lock_object, Giant); \
|
|
}
|
|
#endif
|
|
|
|
#define UGAR(rval) do { \
|
|
int _val = (rval); \
|
|
mtx_unlock(&Giant); \
|
|
return (_val); \
|
|
} while (0)
|
|
|
|
struct mtx_args {
|
|
void *ma_mtx;
|
|
const char *ma_desc;
|
|
int ma_opts;
|
|
};
|
|
|
|
#define MTX_SYSINIT(name, mtx, desc, opts) \
|
|
static struct mtx_args name##_args = { \
|
|
(mtx), \
|
|
(desc), \
|
|
(opts) \
|
|
}; \
|
|
SYSINIT(name##_mtx_sysinit, SI_SUB_LOCK, SI_ORDER_MIDDLE, \
|
|
mtx_sysinit, &name##_args); \
|
|
SYSUNINIT(name##_mtx_sysuninit, SI_SUB_LOCK, SI_ORDER_MIDDLE, \
|
|
_mtx_destroy, __DEVOLATILE(void *, &(mtx)->mtx_lock))
|
|
|
|
/*
|
|
* The INVARIANTS-enabled mtx_assert() functionality.
|
|
*
|
|
* The constants need to be defined for INVARIANT_SUPPORT infrastructure
|
|
* support as _mtx_assert() itself uses them and the latter implies that
|
|
* _mtx_assert() must build.
|
|
*/
|
|
#if defined(INVARIANTS) || defined(INVARIANT_SUPPORT)
|
|
#define MA_OWNED LA_XLOCKED
|
|
#define MA_NOTOWNED LA_UNLOCKED
|
|
#define MA_RECURSED LA_RECURSED
|
|
#define MA_NOTRECURSED LA_NOTRECURSED
|
|
#endif
|
|
|
|
/*
|
|
* Common lock type names.
|
|
*/
|
|
#define MTX_NETWORK_LOCK "network driver"
|
|
|
|
#endif /* _KERNEL */
|
|
#endif /* _SYS_MUTEX_H_ */
|