1 /*
2  *   Copyright (C) International Business Machines Corp., 2000-2001
3  *   Portions Copyright (C) Christoph Hellwig, 2001-2002
4  *
5  *   This program is free software;  you can redistribute it and/or modify
6  *   it under the terms of the GNU General Public License as published by
7  *   the Free Software Foundation; either version 2 of the License, or
8  *   (at your option) any later version.
9  *
10  *   This program is distributed in the hope that it will be useful,
11  *   but WITHOUT ANY WARRANTY;  without even the implied warranty of
12  *   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See
13  *   the GNU General Public License for more details.
14  *
15  *   You should have received a copy of the GNU General Public License
16  *   along with this program;  if not, write to the Free Software
17  *   Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
18  */
19 #ifndef _H_JFS_LOCK
20 #define _H_JFS_LOCK
21 
22 #include <linux/spinlock.h>
23 #include <linux/mutex.h>
24 #include <linux/sched.h>
25 
26 /*
27  *	jfs_lock.h
28  */
29 
30 /*
31  * Conditional sleep where condition is protected by spinlock
32  *
33  * lock_cmd and unlock_cmd take and release the spinlock
34  */
35 #define __SLEEP_COND(wq, cond, lock_cmd, unlock_cmd)	\
36 do {							\
37 	DECLARE_WAITQUEUE(__wait, current);		\
38 							\
39 	add_wait_queue(&wq, &__wait);			\
40 	for (;;) {					\
41 		set_current_state(TASK_UNINTERRUPTIBLE);\
42 		if (cond)				\
43 			break;				\
44 		unlock_cmd;				\
45 		io_schedule();				\
46 		lock_cmd;				\
47 	}						\
48 	__set_current_state(TASK_RUNNING);			\
49 	remove_wait_queue(&wq, &__wait);		\
50 } while (0)
51 
52 #endif				/* _H_JFS_LOCK */
53