2 * Copyright (c) 2003 David Xu <davidxu@freebsd.org>
3 * Copyright (c) 2016 The FreeBSD Foundation
6 * Portions of this software were developed by Konstantin Belousov
7 * under sponsorship from the FreeBSD Foundation.
9 * Redistribution and use in source and binary forms, with or without
10 * modification, are permitted provided that the following conditions
12 * 1. Redistributions of source code must retain the above copyright
13 * notice, this list of conditions and the following disclaimer.
14 * 2. Redistributions in binary form must reproduce the above copyright
15 * notice, this list of conditions and the following disclaimer in the
16 * documentation and/or other materials provided with the distribution.
18 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
19 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
20 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
21 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
22 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
23 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
24 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
25 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
26 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
27 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
31 #include <sys/cdefs.h>
32 __FBSDID("$FreeBSD$");
34 #include "namespace.h"
38 #include "un-namespace.h"
40 #include "thr_private.h"
42 _Static_assert(sizeof(struct pthread_spinlock) <= PAGE_SIZE,
43 "pthread_spinlock is too large for off-page");
45 #define SPIN_COUNT 100000
47 __weak_reference(_pthread_spin_init, pthread_spin_init);
48 __weak_reference(_pthread_spin_destroy, pthread_spin_destroy);
49 __weak_reference(_pthread_spin_trylock, pthread_spin_trylock);
50 __weak_reference(_pthread_spin_lock, pthread_spin_lock);
51 __weak_reference(_pthread_spin_unlock, pthread_spin_unlock);
54 _pthread_spin_init(pthread_spinlock_t *lock, int pshared)
56 struct pthread_spinlock *lck;
60 if (pshared == PTHREAD_PROCESS_PRIVATE) {
61 lck = malloc(sizeof(struct pthread_spinlock));
65 } else if (pshared == PTHREAD_PROCESS_SHARED) {
66 lck = __thr_pshared_offpage(lock, 1);
69 *lock = THR_PSHARED_PTR;
73 _thr_umutex_init(&lck->s_lock);
78 _pthread_spin_destroy(pthread_spinlock_t *lock)
83 if (lock == NULL || *lock == NULL) {
85 } else if (*lock == THR_PSHARED_PTR) {
86 l = __thr_pshared_offpage(lock, 0);
88 __thr_pshared_destroy(l);
99 _pthread_spin_trylock(pthread_spinlock_t *lock)
101 struct pthread_spinlock *lck;
103 if (lock == NULL || *lock == NULL)
105 lck = *lock == THR_PSHARED_PTR ? __thr_pshared_offpage(lock, 0) : *lock;
108 return (THR_UMUTEX_TRYLOCK(_get_curthread(), &lck->s_lock));
112 _pthread_spin_lock(pthread_spinlock_t *lock)
114 struct pthread *curthread;
115 struct pthread_spinlock *lck;
120 lck = *lock == THR_PSHARED_PTR ? __thr_pshared_offpage(lock, 0) : *lock;
124 curthread = _get_curthread();
126 while (THR_UMUTEX_TRYLOCK(curthread, &lck->s_lock) != 0) {
127 while (lck->s_lock.m_owner) {
143 _pthread_spin_unlock(pthread_spinlock_t *lock)
145 struct pthread_spinlock *lck;
149 lck = *lock == THR_PSHARED_PTR ? __thr_pshared_offpage(lock, 0) : *lock;
152 return (THR_UMUTEX_UNLOCK(_get_curthread(), &lck->s_lock));