/* SPDX-License-Identifier: GPL-2.0 */ /* rwsem-spinlock.h: fallback C implementation * * Copyright (c) 2001 David Howells (dhowells@redhat.com). * - Derived partially from ideas by Andrea Arcangeli <andrea@suse.de> * - Derived also from comments by Linus */ #ifndef _LINUX_RWSEM_SPINLOCK_H #define _LINUX_RWSEM_SPINLOCK_H #ifndef _LINUX_RWSEM_H #error "please don't include linux/rwsem-spinlock.h directly, use linux/rwsem.h instead" #endif #ifdef __KERNEL__ /* * the rw-semaphore definition * - if count is 0 then there are no active readers or writers * - if count is +ve then that is the number of active readers * - if count is -1 then there is one active writer * - if wait_list is not empty, then there are processes waiting for the semaphore */ struct rw_semaphore { __s32 count; raw_spinlock_t wait_lock; struct list_head wait_list; #ifdef CONFIG_DEBUG_LOCK_ALLOC struct lockdep_map dep_map; #endif }; #define RWSEM_UNLOCKED_VALUE 0x00000000 extern void __down_read(struct rw_semaphore *sem); extern int __must_check __down_read_killable(struct rw_semaphore *sem); extern int __down_read_trylock(struct rw_semaphore *sem); extern void __down_write(struct rw_semaphore *sem); extern int __must_check __down_write_killable(struct rw_semaphore *sem); extern int __down_write_trylock(struct rw_semaphore *sem); extern void __up_read(struct rw_semaphore *sem); extern void __up_write(struct rw_semaphore *sem); extern void __downgrade_write(struct rw_semaphore *sem); extern int rwsem_is_locked(struct rw_semaphore *sem); #endif /* __KERNEL__ */ #endif /* _LINUX_RWSEM_SPINLOCK_H */Overall Contributors
Person | Tokens | Prop | Commits | CommitProp |
Linus Torvalds | 53 | 33.97% | 3 | 20.00% |
Harvey Harrison | 35 | 22.44% | 1 | 6.67% |
Ingo Molnar | 16 | 10.26% | 1 | 6.67% |
Christoph Hellwig | 13 | 8.33% | 1 | 6.67% |
Michal Hocko | 11 | 7.05% | 1 | 6.67% |
Kirill Tkhai | 11 | 7.05% | 1 | 6.67% |
Rik Van Riel | 8 | 5.13% | 1 | 6.67% |
Thomas Gleixner | 3 | 1.92% | 2 | 13.33% |
Américo Wang | 2 | 1.28% | 1 | 6.67% |
Peter Zijlstra | 2 | 1.28% | 1 | 6.67% |
Michael Hayes | 1 | 0.64% | 1 | 6.67% |
Greg Kroah-Hartman | 1 | 0.64% | 1 | 6.67% |
Total | 156 | 100.00% | 15 | 100.00% |