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vq / vlib / builtin / closure / closure_once_nix.h
28 lines · 22 sloc · 653 bytes · 1a2d0e5b70d6dd1baaa60290f2446e9ece4324bf
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1#ifndef V_CLOSURE_ONCE_NIX_H


2#define V_CLOSURE_ONCE_NIX_H


3


4#include <pthread.h>


5


6typedef void (*v_closure_init_fn)(void);


7


8#ifndef V_CLOSURE_STATIC_INLINE


9# ifdef _MSC_VER


10#  define V_CLOSURE_STATIC_INLINE static __inline


11# else


12#  define V_CLOSURE_STATIC_INLINE static inline


13# endif


14#endif


15


16static pthread_mutex_t v_closure_once_mutex = PTHREAD_MUTEX_INITIALIZER;


17static int v_closure_once_done = 0;


18


19V_CLOSURE_STATIC_INLINE void v_closure_init_once(v_closure_init_fn init_fn) {


20    pthread_mutex_lock(&v_closure_once_mutex);


21    if (!v_closure_once_done) {


22        init_fn();


23        v_closure_once_done = 1;


24    }


25    pthread_mutex_unlock(&v_closure_once_mutex);


26}


27


28#endif


29