objc/objc_lock.h

   1 #import <stdbool.h>
   2 #include <unistd.h>
   3
   4 typedef unsigned int objc_lock;
   5
   6 static inline bool objc_lock_try(volatile objc_lock *__lock) {
   7     return __sync_bool_compare_and_swap(__lock, 0, 1);
   8 }
   9
  10 static inline void objc_lock_lock(volatile objc_lock *__lock) {
  11     while(!__sync_bool_compare_and_swap(__lock, 0, 1)) {
  12 #ifdef WIN32
  13         Sleep(0);
  14 #else
  15         usleep(1);
  16 #endif
  17     }
  18 }
  19
  20 static inline void objc_lock_unlock(volatile objc_lock *__lock) {
  21     __sync_bool_compare_and_swap(__lock, 1, 0);
  22 }