tools/perf/util/rwsem.h

   1 #ifndef _PERF_RWSEM_H
   2 #define _PERF_RWSEM_H
   3
   4 #include <pthread.h>
   5 #include "mutex.h"
   6
   7 /*
   8  * Mutexes have additional error checking. Enable to use a mutex rather than a
   9  * rwlock for debugging.
  10  */
  11 #define RWS_ERRORCHECK 0
  12
  13 struct rw_semaphore {
  14 #if RWS_ERRORCHECK
  15         struct mutex mtx;
  16 #else
  17         pthread_rwlock_t lock;
  18 #endif
  19 };
  20
  21 int init_rwsem(struct rw_semaphore *sem);
  22 int exit_rwsem(struct rw_semaphore *sem);
  23
  24 int down_read(struct rw_semaphore *sem);
  25 int up_read(struct rw_semaphore *sem);
  26
  27 int down_write(struct rw_semaphore *sem);
  28 int up_write(struct rw_semaphore *sem);
  29
  30 #endif /* _PERF_RWSEM_H */