tools/include/linux/rwsem.h

   1 /* SPDX-License-Identifier: GPL-2.0+ */
   2 #ifndef _TOOLS__RWSEM_H
   3 #define _TOOLS__RWSEM_H
   4
   5 #include <pthread.h>
   6
   7 struct rw_semaphore {
   8         pthread_rwlock_t lock;
   9 };
  10
  11 static inline int init_rwsem(struct rw_semaphore *sem)
  12 {
  13         return pthread_rwlock_init(&sem->lock, NULL);
  14 }
  15
  16 static inline int exit_rwsem(struct rw_semaphore *sem)
  17 {
  18         return pthread_rwlock_destroy(&sem->lock);
  19 }
  20
  21 static inline int down_read(struct rw_semaphore *sem)
  22 {
  23         return pthread_rwlock_rdlock(&sem->lock);
  24 }
  25
  26 static inline int up_read(struct rw_semaphore *sem)
  27 {
  28         return pthread_rwlock_unlock(&sem->lock);
  29 }
  30
  31 static inline int down_write(struct rw_semaphore *sem)
  32 {
  33         return pthread_rwlock_wrlock(&sem->lock);
  34 }
  35
  36 static inline int up_write(struct rw_semaphore *sem)
  37 {
  38         return pthread_rwlock_unlock(&sem->lock);
  39 }
  40
  41 #define down_read_nested(sem, subclass)         down_read(sem)
  42 #define down_write_nested(sem, subclass)        down_write(sem)
  43
  44 #endif /* _TOOLS_RWSEM_H */