/***
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 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.
***/
+#include <pulsecore/mutex.h>
#include <pulsecore/atomic.h>
typedef struct pa_once {
- pa_atomic_int_t atomic;
-} pa_once_t;
+ pa_atomic_ptr_t mutex;
+ pa_atomic_t ref, done;
+} pa_once;
-#define PA_ONCE_INIT { PA_ATOMIC_INIT(0) }
+#define PA_ONCE_INIT \
+ { \
+ .mutex = PA_ATOMIC_PTR_INIT(NULL), \
+ .ref = PA_ATOMIC_INIT(0), \
+ .done = PA_ATOMIC_INIT(0) \
+ }
-#define pa_once_test(o) (pa_atomic_cmpxchg(&(o)->atomic, 0, 1))
+/* 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);
-typedef void (*pa_once_func_t) (void);
+#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)
+
+/*
-static inline void pa_once(pa_once_t *o, pa_once_func_t f) {
- if (pa_once_test(o))
- f();
-}
+ Usage of these macros is like this:
+
+ void foo() {
+
+ 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