~ [ source navigation ] ~ [ diff markup ] ~ [ identifier search ] ~

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

Version: ~ [ linux-5.17-rc1 ] ~ [ linux-5.16.2 ] ~ [ linux-5.15.16 ] ~ [ linux-5.14.21 ] ~ [ linux-5.13.19 ] ~ [ linux-5.12.19 ] ~ [ linux-5.11.22 ] ~ [ linux-5.10.93 ] ~ [ linux-5.9.16 ] ~ [ linux-5.8.18 ] ~ [ linux-5.7.19 ] ~ [ linux-5.6.19 ] ~ [ linux-5.5.19 ] ~ [ linux-5.4.173 ] ~ [ linux-5.3.18 ] ~ [ linux-5.2.21 ] ~ [ linux-5.1.21 ] ~ [ linux-5.0.21 ] ~ [ linux-4.20.17 ] ~ [ linux-4.19.225 ] ~ [ linux-4.18.20 ] ~ [ linux-4.17.19 ] ~ [ linux-4.16.18 ] ~ [ linux-4.15.18 ] ~ [ linux-4.14.262 ] ~ [ linux-4.13.16 ] ~ [ linux-4.12.14 ] ~ [ linux-4.11.12 ] ~ [ linux-4.10.17 ] ~ [ linux-4.9.297 ] ~ [ linux-4.8.17 ] ~ [ linux-4.7.10 ] ~ [ linux-4.6.7 ] ~ [ linux-4.5.7 ] ~ [ linux-4.4.299 ] ~ [ linux-4.3.6 ] ~ [ linux-4.2.8 ] ~ [ linux-4.1.52 ] ~ [ linux-4.0.9 ] ~ [ linux-3.18.140 ] ~ [ linux-3.16.85 ] ~ [ linux-3.14.79 ] ~ [ linux-3.12.74 ] ~ [ linux-3.10.108 ] ~ [ linux-2.6.32.71 ] ~ [ linux-2.6.0 ] ~ [ linux-2.4.37.11 ] ~ [ unix-v6-master ] ~ [ ccs-tools-1.8.5 ] ~ [ policy-sample ] ~
Architecture: ~ [ i386 ] ~ [ alpha ] ~ [ m68k ] ~ [ mips ] ~ [ ppc ] ~ [ sparc ] ~ [ sparc64 ] ~

  1 /* SPDX-License-Identifier: GPL-2.0 */
  2 /* rwsem-spinlock.h: fallback C implementation
  3  *
  4  * Copyright (c) 2001   David Howells (dhowells@redhat.com).
  5  * - Derived partially from ideas by Andrea Arcangeli <andrea@suse.de>
  6  * - Derived also from comments by Linus
  7  */
  8 
  9 #ifndef _LINUX_RWSEM_SPINLOCK_H
 10 #define _LINUX_RWSEM_SPINLOCK_H
 11 
 12 #ifndef _LINUX_RWSEM_H
 13 #error "please don't include linux/rwsem-spinlock.h directly, use linux/rwsem.h instead"
 14 #endif
 15 
 16 #ifdef __KERNEL__
 17 /*
 18  * the rw-semaphore definition
 19  * - if count is 0 then there are no active readers or writers
 20  * - if count is +ve then that is the number of active readers
 21  * - if count is -1 then there is one active writer
 22  * - if wait_list is not empty, then there are processes waiting for the semaphore
 23  */
 24 struct rw_semaphore {
 25         __s32                   count;
 26         raw_spinlock_t          wait_lock;
 27         struct list_head        wait_list;
 28 #ifdef CONFIG_DEBUG_LOCK_ALLOC
 29         struct lockdep_map dep_map;
 30 #endif
 31 };
 32 
 33 #define RWSEM_UNLOCKED_VALUE            0x00000000
 34 
 35 extern void __down_read(struct rw_semaphore *sem);
 36 extern int __must_check __down_read_killable(struct rw_semaphore *sem);
 37 extern int __down_read_trylock(struct rw_semaphore *sem);
 38 extern void __down_write(struct rw_semaphore *sem);
 39 extern int __must_check __down_write_killable(struct rw_semaphore *sem);
 40 extern int __down_write_trylock(struct rw_semaphore *sem);
 41 extern void __up_read(struct rw_semaphore *sem);
 42 extern void __up_write(struct rw_semaphore *sem);
 43 extern void __downgrade_write(struct rw_semaphore *sem);
 44 extern int rwsem_is_locked(struct rw_semaphore *sem);
 45 
 46 #endif /* __KERNEL__ */
 47 #endif /* _LINUX_RWSEM_SPINLOCK_H */
 48 

~ [ source navigation ] ~ [ diff markup ] ~ [ identifier search ] ~

kernel.org | git.kernel.org | LWN.net | Project Home | Wiki (Japanese) | Wiki (English) | SVN repository | Mail admin

Linux® is a registered trademark of Linus Torvalds in the United States and other countries.
TOMOYO® is a registered trademark of NTT DATA CORPORATION.

osdn.jp