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89 lines
2.2 KiB
C
89 lines
2.2 KiB
C
/***
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This file is part of PulseAudio.
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Copyright 2006 Lennart Poettering
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PulseAudio is free software; you can redistribute it and/or modify
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it under the terms of the GNU Lesser General Public License as published
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by the Free Software Foundation; either version 2.1 of the License,
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or (at your option) any later version.
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PulseAudio is distributed in the hope that it will be useful, but
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WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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General Public License for more details.
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You should have received a copy of the GNU Lesser General Public License
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along with PulseAudio; if not, write to the Free Software
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Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307
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USA.
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***/
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#ifdef HAVE_CONFIG_H
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#include <config.h>
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#endif
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#include <errno.h>
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#include <pthread.h>
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#include <semaphore.h>
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#include <pulse/xmalloc.h>
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#include <pulsecore/macro.h>
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#include "semaphore.h"
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struct pa_semaphore {
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sem_t sem;
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};
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pa_semaphore* pa_semaphore_new(unsigned value) {
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pa_semaphore *s;
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s = pa_xnew(pa_semaphore, 1);
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pa_assert_se(sem_init(&s->sem, 0, value) == 0);
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return s;
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}
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void pa_semaphore_free(pa_semaphore *s) {
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pa_assert(s);
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pa_assert_se(sem_destroy(&s->sem) == 0);
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pa_xfree(s);
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}
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void pa_semaphore_post(pa_semaphore *s) {
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pa_assert(s);
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pa_assert_se(sem_post(&s->sem) == 0);
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}
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void pa_semaphore_wait(pa_semaphore *s) {
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int ret;
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pa_assert(s);
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do {
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ret = sem_wait(&s->sem);
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} while (ret < 0 && errno == EINTR);
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pa_assert(ret == 0);
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}
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pa_semaphore* pa_static_semaphore_get(pa_static_semaphore *s, unsigned value) {
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pa_semaphore *m;
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pa_assert(s);
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/* First, check if already initialized and short cut */
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if ((m = pa_atomic_ptr_load(&s->ptr)))
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return m;
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/* OK, not initialized, so let's allocate, and fill in */
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m = pa_semaphore_new(value);
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if ((pa_atomic_ptr_cmpxchg(&s->ptr, NULL, m)))
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return m;
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pa_semaphore_free(m);
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/* Him, filling in failed, so someone else must have filled in
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* already */
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pa_assert_se(m = pa_atomic_ptr_load(&s->ptr));
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return m;
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}
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