diff options
Diffstat (limited to 'src/pulsecore/once.h')
-rw-r--r-- | src/pulsecore/once.h | 48 |
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 |