5e53a4f90f
Mainly focus on files that use BSD 2-Clause license, however the tool I was using mis-identified many licenses so this was mostly a manual - error prone - task. The Software Package Data Exchange (SPDX) group provides a specification to make it easier for automated tools to detect and summarize well known opensource licenses. We are gradually adopting the specification, noting that the tags are considered only advisory and do not, in any way, superceed or replace the license texts.
273 lines
8.0 KiB
C
273 lines
8.0 KiB
C
/*-
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* SPDX-License-Identifier: BSD-2-Clause-FreeBSD
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*
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* Copyright (c) 2005 David Xu <davidxu@freebsd.org>
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* 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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*
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* THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``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 THE AUTHOR OR CONTRIBUTORS 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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* $FreeBSD$
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*/
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#ifndef _THR_FBSD_UMTX_H_
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#define _THR_FBSD_UMTX_H_
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#include <strings.h>
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#include <sys/umtx.h>
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#ifdef __LP64__
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#define DEFAULT_UMUTEX {0,0,{0,0},0,{0,0}}
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#else
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#define DEFAULT_UMUTEX {0,0,{0,0},0,0,{0,0}}
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#endif
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#define DEFAULT_URWLOCK {0,0,0,0,{0,0,0,0}}
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int _umtx_op_err(void *, int op, u_long, void *, void *) __hidden;
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int __thr_umutex_lock(struct umutex *mtx, uint32_t id) __hidden;
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int __thr_umutex_lock_spin(struct umutex *mtx, uint32_t id) __hidden;
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int __thr_umutex_timedlock(struct umutex *mtx, uint32_t id,
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const struct timespec *timeout) __hidden;
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int __thr_umutex_unlock(struct umutex *mtx) __hidden;
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int __thr_umutex_trylock(struct umutex *mtx) __hidden;
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int __thr_umutex_set_ceiling(struct umutex *mtx, uint32_t ceiling,
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uint32_t *oldceiling) __hidden;
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void _thr_umutex_init(struct umutex *mtx) __hidden;
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void _thr_urwlock_init(struct urwlock *rwl) __hidden;
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int _thr_umtx_wait(volatile long *mtx, long exp,
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const struct timespec *timeout) __hidden;
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int _thr_umtx_wait_uint(volatile u_int *mtx, u_int exp,
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const struct timespec *timeout, int shared) __hidden;
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int _thr_umtx_timedwait_uint(volatile u_int *mtx, u_int exp, int clockid,
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const struct timespec *timeout, int shared) __hidden;
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int _thr_umtx_wake(volatile void *mtx, int count, int shared) __hidden;
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int _thr_ucond_wait(struct ucond *cv, struct umutex *m,
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const struct timespec *timeout, int flags) __hidden;
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void _thr_ucond_init(struct ucond *cv) __hidden;
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int _thr_ucond_signal(struct ucond *cv) __hidden;
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int _thr_ucond_broadcast(struct ucond *cv) __hidden;
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int __thr_rwlock_rdlock(struct urwlock *rwlock, int flags,
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const struct timespec *tsp) __hidden;
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int __thr_rwlock_wrlock(struct urwlock *rwlock,
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const struct timespec *tsp) __hidden;
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int __thr_rwlock_unlock(struct urwlock *rwlock) __hidden;
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/* Internal used only */
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void _thr_rwl_rdlock(struct urwlock *rwlock) __hidden;
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void _thr_rwl_wrlock(struct urwlock *rwlock) __hidden;
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void _thr_rwl_unlock(struct urwlock *rwlock) __hidden;
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static inline int
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_thr_umutex_trylock(struct umutex *mtx, uint32_t id)
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{
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if (atomic_cmpset_acq_32(&mtx->m_owner, UMUTEX_UNOWNED, id))
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return (0);
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if (__predict_false((uint32_t)mtx->m_owner == UMUTEX_RB_OWNERDEAD) &&
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atomic_cmpset_acq_32(&mtx->m_owner, UMUTEX_RB_OWNERDEAD,
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id | UMUTEX_CONTESTED))
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return (EOWNERDEAD);
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if (__predict_false((uint32_t)mtx->m_owner == UMUTEX_RB_NOTRECOV))
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return (ENOTRECOVERABLE);
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if ((mtx->m_flags & UMUTEX_PRIO_PROTECT) == 0)
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return (EBUSY);
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return (__thr_umutex_trylock(mtx));
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}
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static inline int
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_thr_umutex_trylock2(struct umutex *mtx, uint32_t id)
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{
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if (atomic_cmpset_acq_32(&mtx->m_owner, UMUTEX_UNOWNED, id) != 0)
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return (0);
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if ((uint32_t)mtx->m_owner == UMUTEX_CONTESTED &&
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__predict_true((mtx->m_flags & (UMUTEX_PRIO_PROTECT |
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UMUTEX_PRIO_INHERIT)) == 0) &&
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atomic_cmpset_acq_32(&mtx->m_owner, UMUTEX_CONTESTED,
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id | UMUTEX_CONTESTED))
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return (0);
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if (__predict_false((uint32_t)mtx->m_owner == UMUTEX_RB_OWNERDEAD) &&
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atomic_cmpset_acq_32(&mtx->m_owner, UMUTEX_RB_OWNERDEAD,
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id | UMUTEX_CONTESTED))
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return (EOWNERDEAD);
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if (__predict_false((uint32_t)mtx->m_owner == UMUTEX_RB_NOTRECOV))
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return (ENOTRECOVERABLE);
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return (EBUSY);
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}
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static inline int
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_thr_umutex_lock(struct umutex *mtx, uint32_t id)
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{
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if (_thr_umutex_trylock2(mtx, id) == 0)
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return (0);
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return (__thr_umutex_lock(mtx, id));
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}
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static inline int
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_thr_umutex_lock_spin(struct umutex *mtx, uint32_t id)
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{
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if (_thr_umutex_trylock2(mtx, id) == 0)
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return (0);
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return (__thr_umutex_lock_spin(mtx, id));
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}
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static inline int
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_thr_umutex_timedlock(struct umutex *mtx, uint32_t id,
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const struct timespec *timeout)
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{
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if (_thr_umutex_trylock2(mtx, id) == 0)
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return (0);
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return (__thr_umutex_timedlock(mtx, id, timeout));
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}
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static inline int
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_thr_umutex_unlock2(struct umutex *mtx, uint32_t id, int *defer)
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{
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uint32_t flags, owner;
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bool noncst;
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flags = mtx->m_flags;
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noncst = (flags & UMUTEX_NONCONSISTENT) != 0;
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if ((flags & (UMUTEX_PRIO_PROTECT | UMUTEX_PRIO_INHERIT)) != 0) {
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if (atomic_cmpset_rel_32(&mtx->m_owner, id, noncst ?
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UMUTEX_RB_NOTRECOV : UMUTEX_UNOWNED))
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return (0);
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return (__thr_umutex_unlock(mtx));
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}
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do {
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owner = mtx->m_owner;
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if (__predict_false((owner & ~UMUTEX_CONTESTED) != id))
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return (EPERM);
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} while (__predict_false(!atomic_cmpset_rel_32(&mtx->m_owner, owner,
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noncst ? UMUTEX_RB_NOTRECOV : UMUTEX_UNOWNED)));
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if ((owner & UMUTEX_CONTESTED) != 0) {
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if (defer == NULL || noncst)
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(void)_umtx_op_err(mtx, UMTX_OP_MUTEX_WAKE2,
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flags, 0, 0);
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else
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*defer = 1;
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}
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return (0);
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}
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static inline int
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_thr_umutex_unlock(struct umutex *mtx, uint32_t id)
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{
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return (_thr_umutex_unlock2(mtx, id, NULL));
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}
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static inline int
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_thr_rwlock_tryrdlock(struct urwlock *rwlock, int flags)
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{
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int32_t state, wrflags;
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if ((flags & URWLOCK_PREFER_READER) != 0 ||
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(rwlock->rw_flags & URWLOCK_PREFER_READER) != 0)
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wrflags = URWLOCK_WRITE_OWNER;
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else
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wrflags = URWLOCK_WRITE_OWNER | URWLOCK_WRITE_WAITERS;
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state = rwlock->rw_state;
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while (!(state & wrflags)) {
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if (__predict_false(URWLOCK_READER_COUNT(state) ==
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URWLOCK_MAX_READERS))
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return (EAGAIN);
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if (atomic_cmpset_acq_32(&rwlock->rw_state, state, state + 1))
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return (0);
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state = rwlock->rw_state;
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}
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return (EBUSY);
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}
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static inline int
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_thr_rwlock_trywrlock(struct urwlock *rwlock)
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{
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int32_t state;
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state = rwlock->rw_state;
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while ((state & URWLOCK_WRITE_OWNER) == 0 &&
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URWLOCK_READER_COUNT(state) == 0) {
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if (atomic_cmpset_acq_32(&rwlock->rw_state, state,
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state | URWLOCK_WRITE_OWNER))
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return (0);
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state = rwlock->rw_state;
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}
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return (EBUSY);
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}
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static inline int
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_thr_rwlock_rdlock(struct urwlock *rwlock, int flags, struct timespec *tsp)
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{
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if (_thr_rwlock_tryrdlock(rwlock, flags) == 0)
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return (0);
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return (__thr_rwlock_rdlock(rwlock, flags, tsp));
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}
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static inline int
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_thr_rwlock_wrlock(struct urwlock *rwlock, struct timespec *tsp)
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{
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if (_thr_rwlock_trywrlock(rwlock) == 0)
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return (0);
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return (__thr_rwlock_wrlock(rwlock, tsp));
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}
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static inline int
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_thr_rwlock_unlock(struct urwlock *rwlock)
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{
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int32_t state;
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state = rwlock->rw_state;
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if ((state & URWLOCK_WRITE_OWNER) != 0) {
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if (atomic_cmpset_rel_32(&rwlock->rw_state,
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URWLOCK_WRITE_OWNER, 0))
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return (0);
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} else {
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for (;;) {
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if (__predict_false(URWLOCK_READER_COUNT(state) == 0))
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return (EPERM);
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if (!((state & (URWLOCK_WRITE_WAITERS |
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URWLOCK_READ_WAITERS)) != 0 &&
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URWLOCK_READER_COUNT(state) == 1)) {
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if (atomic_cmpset_rel_32(&rwlock->rw_state,
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state, state - 1))
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return (0);
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state = rwlock->rw_state;
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} else {
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break;
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}
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}
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}
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return (__thr_rwlock_unlock(rwlock));
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}
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#endif
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