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Linux/include/linux/rwsem-spinlock.h

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  1 /* rwsem-spinlock.h: fallback C implementation
  2  *
  3  * Copyright (c) 2001   David Howells (dhowells@redhat.com).
  4  * - Derived partially from ideas by Andrea Arcangeli <andrea@suse.de>
  5  * - Derived also from comments by Linus
  6  */
  7 
  8 #ifndef _LINUX_RWSEM_SPINLOCK_H
  9 #define _LINUX_RWSEM_SPINLOCK_H
 10 
 11 #ifndef _LINUX_RWSEM_H
 12 #error "please don't include linux/rwsem-spinlock.h directly, use linux/rwsem.h instead"
 13 #endif
 14 
 15 #ifdef __KERNEL__
 16 /*
 17  * the rw-semaphore definition
 18  * - if count is 0 then there are no active readers or writers
 19  * - if count is +ve then that is the number of active readers
 20  * - if count is -1 then there is one active writer
 21  * - if wait_list is not empty, then there are processes waiting for the semaphore
 22  */
 23 struct rw_semaphore {
 24         __s32                   count;
 25         raw_spinlock_t          wait_lock;
 26         struct list_head        wait_list;
 27 #ifdef CONFIG_DEBUG_LOCK_ALLOC
 28         struct lockdep_map dep_map;
 29 #endif
 30 };
 31 
 32 #define RWSEM_UNLOCKED_VALUE            0x00000000
 33 
 34 extern void __down_read(struct rw_semaphore *sem);
 35 extern int __down_read_trylock(struct rw_semaphore *sem);
 36 extern void __down_write(struct rw_semaphore *sem);
 37 extern int __must_check __down_write_killable(struct rw_semaphore *sem);
 38 extern int __down_write_trylock(struct rw_semaphore *sem);
 39 extern void __up_read(struct rw_semaphore *sem);
 40 extern void __up_write(struct rw_semaphore *sem);
 41 extern void __downgrade_write(struct rw_semaphore *sem);
 42 extern int rwsem_is_locked(struct rw_semaphore *sem);
 43 
 44 #endif /* __KERNEL__ */
 45 #endif /* _LINUX_RWSEM_SPINLOCK_H */
 46 

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