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-rw-r--r--src/pulsecore/once.h48
1 files changed, 42 insertions, 6 deletions
diff --git a/src/pulsecore/once.h b/src/pulsecore/once.h
index c20fc0b4..c9fe6d0a 100644
--- a/src/pulsecore/once.h
+++ b/src/pulsecore/once.h
@@ -25,16 +25,52 @@
***/
#include <pulsecore/mutex.h>
+#include <pulsecore/atomic.h>
typedef struct pa_once {
- unsigned int once_value;
- pa_mutex *mutex;
-} pa_once_t;
+ pa_atomic_ptr_t mutex;
+ pa_atomic_t ref, done;
+} pa_once;
-#define PA_ONCE_INIT { .once_value = 0, .mutex = NULL }
+#define PA_ONCE_INIT \
+ { \
+ .mutex = PA_ATOMIC_PTR_INIT(NULL), \
+ .ref = PA_ATOMIC_INIT(0), \
+ .done = PA_ATOMIC_INIT(0) \
+ }
-typedef void (*pa_once_func_t) (void);
+/* Not to be called directly, use the macros defined below instead */
+int pa_once_begin(pa_once *o);
+void pa_once_end(pa_once *o);
+
+#define PA_ONCE_BEGIN \
+ do { \
+ static pa_once _once = PA_ONCE_INIT; \
+ if (pa_once_begin(&_once)) {{
+
+#define PA_ONCE_END \
+ } \
+ pa_once_end(&_once); \
+ } \
+ } while(0)
+
+/*
+
+ Usage of these macros is like this:
+
+ void foo() {
-void pa_once(pa_once_t *o, pa_once_func_t f);
+ PA_ONCE_BEGIN {
+
+ ... stuff to be called just once ...
+
+ } PA_ONCE_END;
+ }
+
+*/
+
+/* Same API but calls a function */
+typedef void (*pa_once_func_t) (void);
+void pa_run_once(pa_once *o, pa_once_func_t f);
#endif