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add two new macros PA_ONCE_BEGIN and PA_ONCE_END which allow usage of pa_once without declaring a function to be called

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git-svn-id: file:///home/lennart/svn/public/pulseaudio/branches/lennart@1820 fefdeb5f-60dc-0310-8127-8f9354f1896f
This commit is contained in:
Lennart Poettering 2007-09-14 21:04:08 +00:00
parent 04ed0f9536
commit bf274cb617
2 changed files with 65 additions and 20 deletions
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32
src/pulsecore/once.h
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@ -39,8 +39,38 @@ typedef struct pa_once {
.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() {
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