add a threading primitive API

git-svn-id: file:///home/lennart/svn/public/pulseaudio/trunk@1344 fefdeb5f-60dc-0310-8127-8f9354f1896f

src/pulsecore/mutex-posix.c

@@ -0,0 +1,121 @@
+/* $Id$ */
+
+/***
+  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,
+  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
+  USA.
+***/
+
+#ifdef HAVE_CONFIG_H
+#include <config.h>
+#endif
+
+#include <assert.h>
+#include <pthread.h>
+#include <atomic_ops.h>
+
+#include <pulse/xmalloc.h>
+
+#include "mutex.h"
+
+#define ASSERT_SUCCESS(x) do { \
+    int _r = (x); \
+    assert(_r == 0); \
+} while(0)
+
+struct pa_mutex {
+    pthread_mutex_t mutex;
+};
+
+struct pa_cond {
+    pthread_cond_t cond;
+};
+
+pa_mutex* pa_mutex_new(int recursive) {
+    pa_mutex *m;
+    pthread_mutexattr_t attr;
+
+    pthread_mutexattr_init(&attr);
+
+    if (recursive)
+        if (pthread_mutexattr_settype(&attr, PTHREAD_MUTEX_RECURSIVE) < 0)
+            return NULL;
+
+    m = pa_xnew(pa_mutex, 1);
+
+    if (pthread_mutex_init(&m->mutex, &attr) < 0) {
+        pa_xfree(m);
+        return NULL;
+    }
+
+    return m;
+}
+
+void pa_mutex_free(pa_mutex *m) {
+    assert(m);
+
+    ASSERT_SUCCESS(pthread_mutex_destroy(&m->mutex));
+    pa_xfree(m);
+}
+
+void pa_mutex_lock(pa_mutex *m) {
+    assert(m);
+
+    ASSERT_SUCCESS(pthread_mutex_lock(&m->mutex));
+}
+
+void pa_mutex_unlock(pa_mutex *m) {
+    assert(m);
+
+    ASSERT_SUCCESS(pthread_mutex_unlock(&m->mutex));
+}
+
+
+pa_cond *pa_cond_new(void) {
+    pa_cond *c;
+
+    c = pa_xnew(pa_cond, 1);
+
+    if (pthread_cond_init(&c->cond, NULL) < 0) {
+        pa_xfree(c);
+        return NULL;
+    }
+
+    return c;
+}
+
+void pa_cond_free(pa_cond *c) {
+    assert(c);
+
+    ASSERT_SUCCESS(pthread_cond_destroy(&c->cond));
+    pa_xfree(c);
+}
+
+void pa_cond_signal(pa_cond *c, int broadcast) {
+    assert(c);
+
+    if (broadcast)
+        ASSERT_SUCCESS(pthread_cond_broadcast(&c->cond));
+    else
+        ASSERT_SUCCESS(pthread_cond_signal(&c->cond));
+}
+
+int pa_cond_wait(pa_cond *c, pa_mutex *m) {
+    assert(c);
+    assert(m);
+
+    return pthread_cond_wait(&c->cond, &m->mutex);
+}