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1 | #ifndef _LINUX_PERCPU_RWSEM_H |
2 | #define _LINUX_PERCPU_RWSEM_H |
3 | |
4 | #include <linux/atomic.h> |
5 | #include <linux/rwsem.h> |
6 | #include <linux/percpu.h> |
7 | #include <linux/wait.h> |
8 | #include <linux/lockdep.h> |
9 | |
10 | struct percpu_rw_semaphore { |
11 | unsigned int __percpu *fast_read_ctr; |
12 | atomic_t write_ctr; |
13 | struct rw_semaphore rw_sem; |
14 | atomic_t slow_read_ctr; |
15 | wait_queue_head_t write_waitq; |
16 | }; |
17 | |
18 | extern void percpu_down_read(struct percpu_rw_semaphore *); |
19 | extern void percpu_up_read(struct percpu_rw_semaphore *); |
20 | |
21 | extern void percpu_down_write(struct percpu_rw_semaphore *); |
22 | extern void percpu_up_write(struct percpu_rw_semaphore *); |
23 | |
24 | extern int __percpu_init_rwsem(struct percpu_rw_semaphore *, |
25 | const char *, struct lock_class_key *); |
26 | extern void percpu_free_rwsem(struct percpu_rw_semaphore *); |
27 | |
28 | #define percpu_init_rwsem(brw) \ |
29 | ({ \ |
30 | static struct lock_class_key rwsem_key; \ |
31 | __percpu_init_rwsem(brw, #brw, &rwsem_key); \ |
32 | }) |
33 | |
34 | #endif |
35 |
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