f066519e91
1. fast simple type mutex.
2. __thread tls works.
3. asynchronous cancellation works ( using signal ).
4. thread synchronization is fully based on umtx, mainly, condition
variable and other synchronization objects were rewritten by using
umtx directly. those objects can be shared between processes via
shared memory, it has to change ABI which does not happen yet.
5. default stack size is increased to 1M on 32 bits platform, 2M for
64 bits platform.
As the result, some mysql super-smack benchmarks show performance is
improved massivly.
Okayed by: jeff, mtm, rwatson, scottl
134 lines
3.4 KiB
C
134 lines
3.4 KiB
C
/*-
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* Copyright (c) 2003 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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#include <errno.h>
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#include <stdlib.h>
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#include <pthread.h>
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#include "thr_private.h"
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#define SPIN_COUNT 100000
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__weak_reference(_pthread_spin_init, pthread_spin_init);
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__weak_reference(_pthread_spin_destroy, pthread_spin_destroy);
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__weak_reference(_pthread_spin_trylock, pthread_spin_trylock);
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__weak_reference(_pthread_spin_lock, pthread_spin_lock);
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__weak_reference(_pthread_spin_unlock, pthread_spin_unlock);
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int
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_pthread_spin_init(pthread_spinlock_t *lock, int pshared)
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{
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struct pthread_spinlock *lck;
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int ret;
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if (lock == NULL || pshared != PTHREAD_PROCESS_PRIVATE)
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ret = EINVAL;
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else if ((lck = malloc(sizeof(struct pthread_spinlock))) == NULL)
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ret = ENOMEM;
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else {
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_thr_umtx_init(&lck->s_lock);
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*lock = lck;
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ret = 0;
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}
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return (ret);
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}
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int
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_pthread_spin_destroy(pthread_spinlock_t *lock)
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{
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int ret;
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if (lock == NULL || *lock == NULL)
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ret = EINVAL;
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else {
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free(*lock);
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*lock = NULL;
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ret = 0;
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}
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return (ret);
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}
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int
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_pthread_spin_trylock(pthread_spinlock_t *lock)
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{
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struct pthread *curthread = _get_curthread();
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struct pthread_spinlock *lck;
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int ret;
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if (lock == NULL || (lck = *lock) == NULL)
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ret = EINVAL;
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else
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ret = THR_UMTX_TRYLOCK(curthread, &lck->s_lock);
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return (ret);
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}
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int
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_pthread_spin_lock(pthread_spinlock_t *lock)
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{
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struct pthread *curthread = _get_curthread();
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struct pthread_spinlock *lck;
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int ret, count;
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if (lock == NULL || (lck = *lock) == NULL)
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ret = EINVAL;
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else {
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count = SPIN_COUNT;
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while ((ret = THR_UMTX_TRYLOCK(curthread, &lck->s_lock)) != 0) {
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while (lck->s_lock) {
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#ifdef __i386__
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/* tell cpu we are spinning */
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__asm __volatile("pause");
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#endif
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if (--count <= 0) {
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count = SPIN_COUNT;
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_pthread_yield();
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}
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}
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}
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ret = 0;
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}
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return (ret);
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}
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int
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_pthread_spin_unlock(pthread_spinlock_t *lock)
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{
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struct pthread *curthread = _get_curthread();
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struct pthread_spinlock *lck;
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int ret;
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if (lock == NULL || (lck = *lock) == NULL)
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ret = EINVAL;
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else {
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ret = THR_UMTX_UNLOCK(curthread, &lck->s_lock);
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}
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return (ret);
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}
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