cregit-Linux how code gets into the kernel

Release 4.12 include/linux/rwsem-spinlock.h

Directory: include/linux
/* 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 __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

PersonTokensPropCommitsCommitProp
Linus Torvalds5336.81%323.08%
Harvey Harrison3524.31%17.69%
Ingo Molnar1611.11%17.69%
Christoph Hellwig139.03%17.69%
Michal Hocko117.64%17.69%
Rik Van Riel85.56%17.69%
Thomas Gleixner32.08%215.38%
Américo Wang21.39%17.69%
Peter Zijlstra21.39%17.69%
Michael Hayes10.69%17.69%
Total144100.00%13100.00%
Directory: include/linux
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