1 files changed, 87 insertions, 0 deletions
diff --git a/src/pulsecore/semaphore-posix.c b/src/pulsecore/semaphore-posix.c
new file mode 100644
index 0000000..7907c19
--- /dev/null
+++ b/src/pulsecore/semaphore-posix.c
@@ -0,0 +1,87 @@
+/***
+  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 <errno.h>
+#include <pthread.h>
+#include <semaphore.h>
+
+#include <pulse/xmalloc.h>
+#include <pulsecore/macro.h>
+
+#include "semaphore.h"
+
+struct pa_semaphore {
+    sem_t sem;
+};
+
+pa_semaphore* pa_semaphore_new(unsigned value) {
+    pa_semaphore *s;
+
+    s = pa_xnew(pa_semaphore, 1);
+    pa_assert_se(sem_init(&s->sem, 0, value) == 0);
+    return s;
+}
+
+void pa_semaphore_free(pa_semaphore *s) {
+    pa_assert(s);
+    pa_assert_se(sem_destroy(&s->sem) == 0);
+    pa_xfree(s);
+}
+
+void pa_semaphore_post(pa_semaphore *s) {
+    pa_assert(s);
+    pa_assert_se(sem_post(&s->sem) == 0);
+}
+
+void pa_semaphore_wait(pa_semaphore *s) {
+    int ret;
+    pa_assert(s);
+
+    do {
+        ret = sem_wait(&s->sem);
+    } while (ret < 0 && errno == EINTR);
+
+    pa_assert(ret == 0);
+}
+
+pa_semaphore* pa_static_semaphore_get(pa_static_semaphore *s, unsigned value) {
+    pa_semaphore *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_semaphore_new(value);
+    if ((pa_atomic_ptr_cmpxchg(&s->ptr, NULL, m)))
+        return m;
+
+    pa_semaphore_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;
+}