Daniel Sloof
59 linhas
1.8 KiB
C
59 linhas
1.8 KiB
C
/*
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+----------------------------------------------------------------------+
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| HipHop for PHP |
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+----------------------------------------------------------------------+
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| Copyright (c) 2010-2013 Facebook, Inc. (http://www.facebook.com) |
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+----------------------------------------------------------------------+
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| This source file is subject to version 3.01 of the PHP license, |
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| that is bundled with this package in the file LICENSE, and is |
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| available through the world-wide-web at the following url: |
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| http://www.php.net/license/3_01.txt |
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| If you did not receive a copy of the PHP license and are unable to |
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| obtain it through the world-wide-web, please send a note to |
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| license@php.net so we can mail you a copy immediately. |
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+----------------------------------------------------------------------+
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*/
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#ifndef PTHREAD_SPIN_LOCK_SHIM
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#define PTHREAD_SPIN_LOCK_SHIM
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#include <errno.h>
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typedef int pthread_spinlock_t;
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inline int pthread_spin_init(pthread_spinlock_t *lock, int pshared) {
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__asm__ __volatile__ ("" ::: "memory");
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*lock = 0;
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return 0;
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}
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inline int pthread_spin_destroy(pthread_spinlock_t *lock) {
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return 0;
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}
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inline int pthread_spin_lock(pthread_spinlock_t *lock) {
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while (1) {
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int i;
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for (i=0; i < 10000; i++) {
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if (__sync_bool_compare_and_swap(lock, 0, 1)) {
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return 0;
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}
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}
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sched_yield();
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}
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}
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inline int pthread_spin_trylock(pthread_spinlock_t *lock) {
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if (__sync_bool_compare_and_swap(lock, 0, 1)) {
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return 0;
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}
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return EBUSY;
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}
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inline int pthread_spin_unlock(pthread_spinlock_t *lock) {
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__asm__ __volatile__ ("" ::: "memory");
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*lock = 0;
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return 0;
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}
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#endif
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