2 /* SPDX-License-Identifier: GPL-2.0 */
3 #ifndef _LINUX_PERCPU_RWSEM_H
4 #define _LINUX_PERCPU_RWSEM_H
7 #include <linux/preempt.h>
9 struct percpu_rw_semaphore {
13 static inline void percpu_down_read_preempt_disable(struct percpu_rw_semaphore *sem)
15 pthread_mutex_lock(&sem->lock);
18 static inline void percpu_down_read(struct percpu_rw_semaphore *sem)
20 pthread_mutex_lock(&sem->lock);
23 static inline int percpu_down_read_trylock(struct percpu_rw_semaphore *sem)
25 return !pthread_mutex_trylock(&sem->lock);
28 static inline void percpu_up_read_preempt_enable(struct percpu_rw_semaphore *sem)
30 pthread_mutex_unlock(&sem->lock);
33 static inline void percpu_up_read(struct percpu_rw_semaphore *sem)
35 pthread_mutex_unlock(&sem->lock);
38 static inline void percpu_down_write(struct percpu_rw_semaphore *sem)
40 pthread_mutex_lock(&sem->lock);
43 static inline void percpu_up_write(struct percpu_rw_semaphore *sem)
45 pthread_mutex_unlock(&sem->lock);
48 static inline void percpu_free_rwsem(struct percpu_rw_semaphore *sem) {}
50 static inline int percpu_init_rwsem(struct percpu_rw_semaphore *sem)
52 pthread_mutex_init(&sem->lock, NULL);
56 #define percpu_rwsem_assert_held(sem) do {} while (0)