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 init_rwsem(struct rw_semaphore * sem)11static inline int init_rwsem(struct rw_semaphore *sem) 12 { 13 return pthread_rwlock_init(&sem->lock, NULL); 14 } 15 exit_rwsem(struct rw_semaphore * sem)16static inline int exit_rwsem(struct rw_semaphore *sem) 17 { 18 return pthread_rwlock_destroy(&sem->lock); 19 } 20 down_read(struct rw_semaphore * sem)21static inline int down_read(struct rw_semaphore *sem) 22 { 23 return pthread_rwlock_rdlock(&sem->lock); 24 } 25 up_read(struct rw_semaphore * sem)26static inline int up_read(struct rw_semaphore *sem) 27 { 28 return pthread_rwlock_unlock(&sem->lock); 29 } 30 down_write(struct rw_semaphore * sem)31static inline int down_write(struct rw_semaphore *sem) 32 { 33 return pthread_rwlock_wrlock(&sem->lock); 34 } 35 up_write(struct rw_semaphore * sem)36static 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 */ 45