common/rwlock.h

   1 #ifndef AL_RWLOCK_H
   2 #define AL_RWLOCK_H
   3
   4 #include "bool.h"
   5 #include "atomic.h"
   6
   7 #ifdef __cplusplus
   8 extern "C" {
   9 #endif
  10
  11 typedef struct {
  12     RefCount read_count;
  13     RefCount write_count;
  14     ATOMIC_FLAG read_lock;
  15     ATOMIC_FLAG read_entry_lock;
  16     ATOMIC_FLAG write_lock;
  17 } RWLock;
  18 #define RWLOCK_STATIC_INITIALIZE { ATOMIC_INIT_STATIC(0), ATOMIC_INIT_STATIC(0),         \
  19                                    ATOMIC_FLAG_INIT, ATOMIC_FLAG_INIT, ATOMIC_FLAG_INIT }
  20
  21 void RWLockInit(RWLock *lock);
  22 void ReadLock(RWLock *lock);
  23 void ReadUnlock(RWLock *lock);
  24 void WriteLock(RWLock *lock);
  25 void WriteUnlock(RWLock *lock);
  26
  27 #ifdef __cplusplus
  28 }
  29 #endif
  30
  31 #endif /* AL_RWLOCK_H */