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/***
This file is part of PulseAudio.
Copyright 2006 Lennart Poettering
PulseAudio is free software; you can redistribute it and/or modify
it under the terms of the GNU Lesser General Public License as published
by the Free Software Foundation; either version 2.1 of the License,
or (at your option) any later version.
PulseAudio is distributed in the hope that it will be useful, but
WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
General Public License for more details.
You should have received a copy of the GNU Lesser General Public License
along with PulseAudio; if not, see <http://www.gnu.org/licenses/>.
***/
#ifdef HAVE_CONFIG_H
#include <config.h>
#endif
#include <pthread.h>
#include <errno.h>
#include <pulse/xmalloc.h>
#include <pulsecore/macro.h>
#include "mutex.h"
struct pa_mutex {
pthread_mutex_t mutex;
};
struct pa_cond {
pthread_cond_t cond;
};
pa_mutex* pa_mutex_new(bool recursive, bool inherit_priority) {
pa_mutex *m;
pthread_mutexattr_t attr;
#ifdef HAVE_PTHREAD_PRIO_INHERIT
int r;
#endif
pa_assert_se(pthread_mutexattr_init(&attr) == 0);
if (recursive)
pa_assert_se(pthread_mutexattr_settype(&attr, PTHREAD_MUTEX_RECURSIVE) == 0);
#ifdef HAVE_PTHREAD_PRIO_INHERIT
if (inherit_priority) {
r = pthread_mutexattr_setprotocol(&attr, PTHREAD_PRIO_INHERIT);
pa_assert(r == 0 || r == ENOTSUP);
}
#endif
m = pa_xnew(pa_mutex, 1);
#ifndef HAVE_PTHREAD_PRIO_INHERIT
pa_assert_se(pthread_mutex_init(&m->mutex, &attr) == 0);
#else
if ((r = pthread_mutex_init(&m->mutex, &attr))) {
/* If this failed, then this was probably due to non-available
* priority inheritance. In which case we fall back to normal
* mutexes. */
pa_assert(r == ENOTSUP && inherit_priority);
pa_assert_se(pthread_mutexattr_setprotocol(&attr, PTHREAD_PRIO_NONE) == 0);
pa_assert_se(pthread_mutex_init(&m->mutex, &attr) == 0);
}
#endif
return m;
}
void pa_mutex_free(pa_mutex *m) {
pa_assert(m);
pa_assert_se(pthread_mutex_destroy(&m->mutex) == 0);
pa_xfree(m);
}
void pa_mutex_lock(pa_mutex *m) {
pa_assert(m);
pa_assert_se(pthread_mutex_lock(&m->mutex) == 0);
}
bool pa_mutex_try_lock(pa_mutex *m) {
int r;
pa_assert(m);
if ((r = pthread_mutex_trylock(&m->mutex)) != 0) {
pa_assert(r == EBUSY);
return false;
}
return true;
}
void pa_mutex_unlock(pa_mutex *m) {
pa_assert(m);
pa_assert_se(pthread_mutex_unlock(&m->mutex) == 0);
}
pa_cond *pa_cond_new(void) {
pa_cond *c;
c = pa_xnew(pa_cond, 1);
pa_assert_se(pthread_cond_init(&c->cond, NULL) == 0);
return c;
}
void pa_cond_free(pa_cond *c) {
pa_assert(c);
pa_assert_se(pthread_cond_destroy(&c->cond) == 0);
pa_xfree(c);
}
void pa_cond_signal(pa_cond *c, int broadcast) {
pa_assert(c);
if (broadcast)
pa_assert_se(pthread_cond_broadcast(&c->cond) == 0);
else
pa_assert_se(pthread_cond_signal(&c->cond) == 0);
}
int pa_cond_wait(pa_cond *c, pa_mutex *m) {
pa_assert(c);
pa_assert(m);
return pthread_cond_wait(&c->cond, &m->mutex);
}
pa_mutex* pa_static_mutex_get(pa_static_mutex *s, bool recursive, bool inherit_priority) {
pa_mutex *m;
pa_assert(s);
/* First, check if already initialized and short cut */
if ((m = pa_atomic_ptr_load(&s->ptr)))
return m;
/* OK, not initialized, so let's allocate, and fill in */
m = pa_mutex_new(recursive, inherit_priority);
if ((pa_atomic_ptr_cmpxchg(&s->ptr, NULL, m)))
return m;
pa_mutex_free(m);
/* Him, filling in failed, so someone else must have filled in
* already */
pa_assert_se(m = pa_atomic_ptr_load(&s->ptr));
return m;
}
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