semaphore: introduce static semaphores

1 files changed, 15 insertions, 0 deletions

diff --git a/src/pulsecore/semaphore.h b/src/pulsecore/semaphore.h
index dc3ca6a5..2bf81496 100644
--- a/src/pulsecore/semaphore.h
+++ b/src/pulsecore/semaphore.h
@@ -22,6 +22,9 @@
   USA.
 ***/
 
+#include <pulsecore/macro.h>
+#include <pulsecore/atomic.h>
+
 typedef struct pa_semaphore pa_semaphore;
 
 pa_semaphore* pa_semaphore_new(unsigned value);
@@ -30,4 +33,16 @@ void pa_semaphore_free(pa_semaphore *m);
 void pa_semaphore_post(pa_semaphore *m);
 void pa_semaphore_wait(pa_semaphore *m);
 
+/* Static semaphores are basically just atomically updated pointers to
+ * pa_semaphore objects */
+
+typedef struct pa_static_semaphore {
+    pa_atomic_ptr_t ptr;
+} pa_static_semaphore;
+
+#define PA_STATIC_SEMAPHORE_INIT { PA_ATOMIC_PTR_INIT(NULL) }
+
+/* When you call this make sure to pass always the same value parameter! */
+pa_semaphore* pa_static_semaphore_get(pa_static_semaphore *m, unsigned value);
+
 #endif