-/* $Id$ */
-
/***
This file is part of PulseAudio.
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
#endif
#include <pthread.h>
+#include <errno.h>
#include <pulse/xmalloc.h>
#include <pulsecore/macro.h>
pthread_cond_t cond;
};
-pa_mutex* pa_mutex_new(pa_bool_t recursive, pa_bool_t inherit_priority) {
+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);
- pthread_mutexattr_init(&attr);
-
if (recursive)
pa_assert_se(pthread_mutexattr_settype(&attr, PTHREAD_MUTEX_RECURSIVE) == 0);
#ifdef HAVE_PTHREAD_PRIO_INHERIT
- if (inherit_priority)
- pthread_mutexattr_setprotocol(&attr, 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;
}
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);
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;
+}