diff options
Diffstat (limited to 'lib/libpthread/thread/thr_pspinlock.c')
| -rw-r--r-- | lib/libpthread/thread/thr_pspinlock.c | 174 |
1 files changed, 0 insertions, 174 deletions
diff --git a/lib/libpthread/thread/thr_pspinlock.c b/lib/libpthread/thread/thr_pspinlock.c deleted file mode 100644 index 5836fde..0000000 --- a/lib/libpthread/thread/thr_pspinlock.c +++ /dev/null @@ -1,174 +0,0 @@ -/*- - * Copyright (c) 2003 David Xu <davidxu@freebsd.org> - * All rights reserved. - * - * Redistribution and use in source and binary forms, with or without - * modification, are permitted provided that the following conditions - * are met: - * 1. Redistributions of source code must retain the above copyright - * notice, this list of conditions and the following disclaimer. - * 2. Redistributions in binary form must reproduce the above copyright - * notice, this list of conditions and the following disclaimer in the - * documentation and/or other materials provided with the distribution. - * - * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND - * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE - * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE - * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE - * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL - * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS - * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) - * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT - * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY - * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF - * SUCH DAMAGE. - * - * $FreeBSD$ - */ - -#include <sys/types.h> -#include <errno.h> -#include <pthread.h> -#include <stdint.h> -#include <stdlib.h> - -#include "atomic_ops.h" -#include "thr_private.h" - -#define SPIN_COUNT 10000 - -LT10_COMPAT_PRIVATE(_pthread_spin_init); -LT10_COMPAT_DEFAULT(pthread_spin_init); -LT10_COMPAT_PRIVATE(_pthread_spin_destroy); -LT10_COMPAT_DEFAULT(pthread_spin_destroy); -LT10_COMPAT_PRIVATE(_pthread_spin_trylock); -LT10_COMPAT_DEFAULT(pthread_spin_trylock); -LT10_COMPAT_PRIVATE(_pthread_spin_lock); -LT10_COMPAT_DEFAULT(pthread_spin_lock); -LT10_COMPAT_PRIVATE(_pthread_spin_unlock); -LT10_COMPAT_DEFAULT(pthread_spin_unlock); - -__weak_reference(_pthread_spin_init, pthread_spin_init); -__weak_reference(_pthread_spin_destroy, pthread_spin_destroy); -__weak_reference(_pthread_spin_trylock, pthread_spin_trylock); -__weak_reference(_pthread_spin_lock, pthread_spin_lock); -__weak_reference(_pthread_spin_unlock, pthread_spin_unlock); - -int -_pthread_spin_init(pthread_spinlock_t *lock, int pshared) -{ - struct pthread_spinlock *lck; - int ret; - - if (lock == NULL || pshared != PTHREAD_PROCESS_PRIVATE) - ret = EINVAL; - else if ((lck = malloc(sizeof(struct pthread_spinlock))) == NULL) - ret = ENOMEM; - else { - lck->s_lock = 0; - lck->s_owner= NULL; - *lock = lck; - ret = 0; - } - - return (ret); -} - -int -_pthread_spin_destroy(pthread_spinlock_t *lock) -{ - int ret; - - if (lock == NULL || *lock == NULL) - ret = EINVAL; - else if ((*lock)->s_owner != NULL) - ret = EBUSY; - else { - free(*lock); - *lock = NULL; - ret = 0; - } - - return (ret); -} - -int -_pthread_spin_trylock(pthread_spinlock_t *lock) -{ - struct pthread_spinlock *lck; - struct pthread *self = _pthread_self(); - int oldval, ret; - - if (lock == NULL || (lck = *lock) == NULL) - ret = EINVAL; - else if (lck->s_owner == self) - ret = EDEADLK; - else if (lck->s_lock != 0) - ret = EBUSY; - else { - atomic_swap_int((int *)&(lck)->s_lock, 1, &oldval); - if (oldval) - ret = EBUSY; - else { - lck->s_owner = _pthread_self(); - ret = 0; - } - } - return (ret); -} - -int -_pthread_spin_lock(pthread_spinlock_t *lock) -{ - struct pthread_spinlock *lck; - struct pthread *self = _pthread_self(); - int count, oldval, ret; - - if (lock == NULL || (lck = *lock) == NULL) - ret = EINVAL; - else if (lck->s_owner == self) - ret = EDEADLK; - else { - do { - count = SPIN_COUNT; - while (lck->s_lock) { -#ifdef __i386__ - /* tell cpu we are spinning */ - __asm __volatile("pause"); -#endif - if (--count <= 0) { - count = SPIN_COUNT; - _pthread_yield(); - } - } - atomic_swap_int((int *)&(lck)->s_lock, 1, &oldval); - } while (oldval); - - lck->s_owner = self; - ret = 0; - } - - return (ret); -} - -int -_pthread_spin_unlock(pthread_spinlock_t *lock) -{ - struct pthread_spinlock *lck; - int ret; - - if (lock == NULL || (lck = *lock) == NULL) - ret = EINVAL; - else { - if (lck->s_owner != _pthread_self()) - ret = EPERM; - else { - lck->s_owner = NULL; - atomic_swap_int((int *)&lck->s_lock, 0, &ret); - ret = 0; - } - } - - return (ret); -} - |
