| #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 |