fs/jfs/jfs_lock.h

Source file repositories/reference/linux-study-clean/fs/jfs/jfs_lock.h

File Facts

System
Linux kernel
Corpus path
fs/jfs/jfs_lock.h
Extension
.h
Size
883 bytes
Lines
40
Domain
Core OS
Bucket
VFS And Filesystem Core
Inferred role
Core OS: implementation source
Status
source implementation candidate

Why This File Exists

Core operating-system implementation surface: boot, tasks, memory, VFS, syscall-facing interfaces, synchronization, credentials, and isolation.

Dependency Surface

Detected Declarations

Annotated Snippet

#ifndef _H_JFS_LOCK
#define _H_JFS_LOCK

#include <linux/spinlock.h>
#include <linux/mutex.h>
#include <linux/sched.h>

/*
 *	jfs_lock.h
 */

/*
 * Conditional sleep where condition is protected by spinlock
 *
 * lock_cmd and unlock_cmd take and release the spinlock
 */
#define __SLEEP_COND(wq, cond, lock_cmd, unlock_cmd)	\
do {							\
	DECLARE_WAITQUEUE(__wait, current);		\
							\
	add_wait_queue(&wq, &__wait);			\
	for (;;) {					\
		set_current_state(TASK_UNINTERRUPTIBLE);\
		if (cond)				\
			break;				\
		unlock_cmd;				\
		io_schedule();				\
		lock_cmd;				\
	}						\
	__set_current_state(TASK_RUNNING);			\
	remove_wait_queue(&wq, &__wait);		\
} while (0)

#endif				/* _H_JFS_LOCK */

Annotation

Implementation Notes