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
28 #include "namespace.h"
29 #include <machine/tls.h>
33 #include <pthread_np.h>
34 #include "un-namespace.h"
36 #include "thr_private.h"
38 #define SPIN_COUNT 100000
41 _pthread_spin_init(pthread_spinlock_t *lock, int pshared)
43 struct pthread_spinlock *lck;
45 if (lock == NULL || pshared != PTHREAD_PROCESS_PRIVATE)
47 if ((lck = malloc(sizeof(struct pthread_spinlock))) == NULL)
49 _thr_umtx_init(&lck->s_lock);
55 _pthread_spin_destroy(pthread_spinlock_t *lock)
59 if (lock == NULL || *lock == NULL) {
70 _pthread_spin_trylock(pthread_spinlock_t *lock)
72 struct pthread *curthread = tls_get_curthread();
73 struct pthread_spinlock *lck;
75 if (lock == NULL || (lck = *lock) == NULL)
77 return (THR_UMTX_TRYLOCK(curthread, &lck->s_lock));
81 _pthread_spin_lock(pthread_spinlock_t *lock)
83 struct pthread *curthread;
84 struct pthread_spinlock *lck;
87 if (lock == NULL || (lck = *lock) == NULL)
90 curthread = tls_get_curthread();
92 while (THR_UMTX_TRYLOCK(curthread, &lck->s_lock) != 0) {
94 CPU_SPINWAIT; /* tell cpu we are spinning */
105 _pthread_spin_unlock(pthread_spinlock_t *lock)
107 struct pthread *curthread = tls_get_curthread();
108 struct pthread_spinlock *lck;
110 if (lock == NULL || (lck = *lock) == NULL)
112 /* XXX: shouldn't return status? */
113 THR_UMTX_UNLOCK(curthread, &lck->s_lock);
117 __strong_reference(_pthread_spin_init, pthread_spin_init);
118 __strong_reference(_pthread_spin_destroy, pthread_spin_destroy);
119 __strong_reference(_pthread_spin_trylock, pthread_spin_trylock);
120 __strong_reference(_pthread_spin_lock, pthread_spin_lock);
121 __strong_reference(_pthread_spin_unlock, pthread_spin_unlock);