Cleanup the TLS implementation:
[dragonfly.git] / lib / libthread_xu / thread / thr_pspinlock.c
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1/*-
2 * Copyright (c) 2003 David Xu <davidxu@freebsd.org>
3 * All rights reserved.
4 *
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that the following conditions
7 * are met:
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.
13 *
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
24 * SUCH DAMAGE.
25 *
26 * $FreeBSD: src/lib/libpthread/thread/thr_pspinlock.c,v 1.2 2003/11/04 19:56:12 deischen Exp $
9e2ee207 27 * $DragonFly: src/lib/libthread_xu/thread/thr_pspinlock.c,v 1.2 2005/03/29 19:26:20 joerg Exp $
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28 */
29
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30#include <machine/tls.h>
31
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32#include <errno.h>
33#include <stdlib.h>
34#include <pthread.h>
35#include "thr_private.h"
36
37#define SPIN_COUNT 100000
38
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);
44
45int
46_pthread_spin_init(pthread_spinlock_t *lock, int pshared)
47{
48 struct pthread_spinlock *lck;
49 int ret;
50
51 if (lock == NULL || pshared != PTHREAD_PROCESS_PRIVATE)
52 ret = EINVAL;
53 else if ((lck = malloc(sizeof(struct pthread_spinlock))) == NULL)
54 ret = ENOMEM;
55 else {
56 _thr_umtx_init(&lck->s_lock);
57 *lock = lck;
58 ret = 0;
59 }
60
61 return (ret);
62}
63
64int
65_pthread_spin_destroy(pthread_spinlock_t *lock)
66{
67 int ret;
68
69 if (lock == NULL || *lock == NULL)
70 ret = EINVAL;
71 else {
72 free(*lock);
73 *lock = NULL;
74 ret = 0;
75 }
76
77 return (ret);
78}
79
80int
81_pthread_spin_trylock(pthread_spinlock_t *lock)
82{
9e2ee207 83 struct pthread *curthread = tls_get_curthread();
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84 struct pthread_spinlock *lck;
85 int ret;
86
87 if (lock == NULL || (lck = *lock) == NULL)
88 ret = EINVAL;
89 else
90 ret = THR_UMTX_TRYLOCK(curthread, &lck->s_lock);
91 return (ret);
92}
93
94int
95_pthread_spin_lock(pthread_spinlock_t *lock)
96{
9e2ee207 97 struct pthread *curthread = tls_get_curthread();
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98 struct pthread_spinlock *lck;
99 int ret, count;
100
101 if (lock == NULL || (lck = *lock) == NULL)
102 ret = EINVAL;
103 else {
104 count = SPIN_COUNT;
105 while ((ret = THR_UMTX_TRYLOCK(curthread, &lck->s_lock)) != 0) {
106 while (lck->s_lock) {
107#ifdef __i386__
108 /* tell cpu we are spinning */
109 __asm __volatile("pause");
110#endif
111 if (--count <= 0) {
112 count = SPIN_COUNT;
113 _pthread_yield();
114 }
115 }
116 }
117 ret = 0;
118 }
119
120 return (ret);
121}
122
123int
124_pthread_spin_unlock(pthread_spinlock_t *lock)
125{
9e2ee207 126 struct pthread *curthread = tls_get_curthread();
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127 struct pthread_spinlock *lck;
128 int ret;
129
130 if (lock == NULL || (lck = *lock) == NULL)
131 ret = EINVAL;
132 else {
133 ret = THR_UMTX_UNLOCK(curthread, &lck->s_lock);
134 }
135 return (ret);
136}