2 * Copyright (c) 2003 David Xu <davidxu@freebsd.org>
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that the following conditions
8 * 1. Redistributions of source code must retain the above copyright
9 * notice, this list of conditions and the following disclaimer.
10 * 2. Redistributions in binary form must reproduce the above copyright
11 * notice, this list of conditions and the following disclaimer in the
12 * documentation and/or other materials provided with the distribution.
14 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
15 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
16 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
17 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
18 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
19 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
20 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
21 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
22 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
23 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
29 #include "namespace.h"
33 #include "un-namespace.h"
35 #include "thr_private.h"
37 #define SPIN_COUNT 100000
39 __weak_reference(_pthread_spin_init, pthread_spin_init);
40 __weak_reference(_pthread_spin_destroy, pthread_spin_destroy);
41 __weak_reference(_pthread_spin_trylock, pthread_spin_trylock);
42 __weak_reference(_pthread_spin_lock, pthread_spin_lock);
43 __weak_reference(_pthread_spin_unlock, pthread_spin_unlock);
46 _pthread_spin_init(pthread_spinlock_t *lock, int pshared)
48 struct pthread_spinlock *lck;
51 if (lock == NULL || pshared != PTHREAD_PROCESS_PRIVATE)
53 else if ((lck = malloc(sizeof(struct pthread_spinlock))) == NULL)
56 _thr_umutex_init(&lck->s_lock);
65 _pthread_spin_destroy(pthread_spinlock_t *lock)
69 if (lock == NULL || *lock == NULL)
81 _pthread_spin_trylock(pthread_spinlock_t *lock)
83 struct pthread *curthread = _get_curthread();
84 struct pthread_spinlock *lck;
87 if (lock == NULL || (lck = *lock) == NULL)
90 ret = THR_UMUTEX_TRYLOCK(curthread, &lck->s_lock);
95 _pthread_spin_lock(pthread_spinlock_t *lock)
97 struct pthread *curthread = _get_curthread();
98 struct pthread_spinlock *lck;
101 if (lock == NULL || (lck = *lock) == NULL)
105 while ((ret = THR_UMUTEX_TRYLOCK(curthread, &lck->s_lock)) != 0) {
106 while (lck->s_lock.m_owner) {
126 _pthread_spin_unlock(pthread_spinlock_t *lock)
128 struct pthread *curthread = _get_curthread();
129 struct pthread_spinlock *lck;
132 if (lock == NULL || (lck = *lock) == NULL)
135 ret = THR_UMUTEX_UNLOCK(curthread, &lck->s_lock);