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TOMOYO Linux Cross Reference
Linux/include/linux/percpu-rwsem.h

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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/rcu_sync.h>
  9 #include <linux/lockdep.h>
 10 
 11 struct percpu_rw_semaphore {
 12         struct rcu_sync         rss;
 13         unsigned int __percpu   *fast_read_ctr;
 14         struct rw_semaphore     rw_sem;
 15         atomic_t                slow_read_ctr;
 16         wait_queue_head_t       write_waitq;
 17 };
 18 
 19 extern void percpu_down_read(struct percpu_rw_semaphore *);
 20 extern int  percpu_down_read_trylock(struct percpu_rw_semaphore *);
 21 extern void percpu_up_read(struct percpu_rw_semaphore *);
 22 
 23 extern void percpu_down_write(struct percpu_rw_semaphore *);
 24 extern void percpu_up_write(struct percpu_rw_semaphore *);
 25 
 26 extern int __percpu_init_rwsem(struct percpu_rw_semaphore *,
 27                                 const char *, struct lock_class_key *);
 28 extern void percpu_free_rwsem(struct percpu_rw_semaphore *);
 29 
 30 #define percpu_init_rwsem(brw)  \
 31 ({                                                              \
 32         static struct lock_class_key rwsem_key;                 \
 33         __percpu_init_rwsem(brw, #brw, &rwsem_key);             \
 34 })
 35 
 36 
 37 #define percpu_rwsem_is_held(sem) lockdep_is_held(&(sem)->rw_sem)
 38 
 39 static inline void percpu_rwsem_release(struct percpu_rw_semaphore *sem,
 40                                         bool read, unsigned long ip)
 41 {
 42         lock_release(&sem->rw_sem.dep_map, 1, ip);
 43 #ifdef CONFIG_RWSEM_SPIN_ON_OWNER
 44         if (!read)
 45                 sem->rw_sem.owner = NULL;
 46 #endif
 47 }
 48 
 49 static inline void percpu_rwsem_acquire(struct percpu_rw_semaphore *sem,
 50                                         bool read, unsigned long ip)
 51 {
 52         lock_acquire(&sem->rw_sem.dep_map, 0, 1, read, 1, NULL, ip);
 53 }
 54 
 55 #endif
 56 

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