-/* $Id$ */
-
/***
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 of the License,
+ 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, write to the Free Software
Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307
#include <config.h>
#endif
-#include <assert.h>
#include <pthread.h>
-
-#include <atomic_ops.h>
+#include <errno.h>
#include <pulse/xmalloc.h>
+#include <pulsecore/macro.h>
#include "mutex.h"
-#define ASSERT_SUCCESS(x) do { \
- int _r = (x); \
- assert(_r == 0); \
-} while(0)
-
struct pa_mutex {
pthread_mutex_t mutex;
};
pthread_cond_t cond;
};
-pa_mutex* pa_mutex_new(int recursive) {
+pa_mutex* pa_mutex_new(pa_bool_t recursive, pa_bool_t inherit_priority) {
pa_mutex *m;
pthread_mutexattr_t attr;
+ int r;
- pthread_mutexattr_init(&attr);
+ pa_assert_se(pthread_mutexattr_init(&attr) == 0);
if (recursive)
- ASSERT_SUCCESS(pthread_mutexattr_settype(&attr, PTHREAD_MUTEX_RECURSIVE));
+ pa_assert_se(pthread_mutexattr_settype(&attr, PTHREAD_MUTEX_RECURSIVE) == 0);
+
+#ifdef HAVE_PTHREAD_PRIO_INHERIT
+ if (inherit_priority)
+ pa_assert_se(pthread_mutexattr_setprotocol(&attr, PTHREAD_PRIO_INHERIT) == 0);
+#endif
m = pa_xnew(pa_mutex, 1);
- ASSERT_SUCCESS(pthread_mutex_init(&m->mutex, &attr));
+#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) {
- assert(m);
+ pa_assert(m);
- ASSERT_SUCCESS(pthread_mutex_destroy(&m->mutex));
+ pa_assert_se(pthread_mutex_destroy(&m->mutex) == 0);
pa_xfree(m);
}
void pa_mutex_lock(pa_mutex *m) {
- assert(m);
+ pa_assert(m);
- ASSERT_SUCCESS(pthread_mutex_lock(&m->mutex));
+ pa_assert_se(pthread_mutex_lock(&m->mutex) == 0);
+}
+
+pa_bool_t 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) {
- assert(m);
+ pa_assert(m);
- ASSERT_SUCCESS(pthread_mutex_unlock(&m->mutex));
+ pa_assert_se(pthread_mutex_unlock(&m->mutex) == 0);
}
pa_cond *pa_cond_new(void) {
pa_cond *c;
c = pa_xnew(pa_cond, 1);
-
- ASSERT_SUCCESS(pthread_cond_init(&c->cond, NULL));
+ pa_assert_se(pthread_cond_init(&c->cond, NULL) == 0);
return c;
}
void pa_cond_free(pa_cond *c) {
- assert(c);
+ pa_assert(c);
- ASSERT_SUCCESS(pthread_cond_destroy(&c->cond));
+ pa_assert_se(pthread_cond_destroy(&c->cond) == 0);
pa_xfree(c);
}
void pa_cond_signal(pa_cond *c, int broadcast) {
- assert(c);
+ pa_assert(c);
if (broadcast)
- ASSERT_SUCCESS(pthread_cond_broadcast(&c->cond));
+ pa_assert_se(pthread_cond_broadcast(&c->cond) == 0);
else
- ASSERT_SUCCESS(pthread_cond_signal(&c->cond));
+ pa_assert_se(pthread_cond_signal(&c->cond) == 0);
}
int pa_cond_wait(pa_cond *c, pa_mutex *m) {
- assert(c);
- assert(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, pa_bool_t recursive, pa_bool_t 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;
+}