| #ifndef _LINUX_PERCPU_RWSEM_H |
| #define _LINUX_PERCPU_RWSEM_H |
| |
| #include <linux/atomic.h> |
| #include <linux/rwsem.h> |
| #include <linux/percpu.h> |
| #include <linux/wait.h> |
| #include <linux/lockdep.h> |
| |
| struct percpu_rw_semaphore { |
| unsigned int __percpu *fast_read_ctr; |
| atomic_t write_ctr; |
| struct rw_semaphore rw_sem; |
| atomic_t slow_read_ctr; |
| wait_queue_head_t write_waitq; |
| }; |
| |
| extern void percpu_down_read(struct percpu_rw_semaphore *); |
| extern void percpu_up_read(struct percpu_rw_semaphore *); |
| |
| extern void percpu_down_write(struct percpu_rw_semaphore *); |
| extern void percpu_up_write(struct percpu_rw_semaphore *); |
| |
| extern int __percpu_init_rwsem(struct percpu_rw_semaphore *, |
| const char *, struct lock_class_key *); |
| extern void percpu_free_rwsem(struct percpu_rw_semaphore *); |
| |
| #define percpu_init_rwsem(brw) \ |
| ({ \ |
| static struct lock_class_key rwsem_key; \ |
| __percpu_init_rwsem(brw, #brw, &rwsem_key); \ |
| }) |
| |
| #endif |
