Linux-2.6.12-rc2
[linux-2.6.git] / fs / jfs / jfs_lock.h
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/sched.h>
24
25 /*
26  *      jfs_lock.h
27  */
28
29 /*
30  * Conditional sleep where condition is protected by spinlock
31  *
32  * lock_cmd and unlock_cmd take and release the spinlock
33  */
34 #define __SLEEP_COND(wq, cond, lock_cmd, unlock_cmd)    \
35 do {                                                    \
36         DECLARE_WAITQUEUE(__wait, current);             \
37                                                         \
38         add_wait_queue(&wq, &__wait);                   \
39         for (;;) {                                      \
40                 set_current_state(TASK_UNINTERRUPTIBLE);\
41                 if (cond)                               \
42                         break;                          \
43                 unlock_cmd;                             \
44                 schedule();                             \
45                 lock_cmd;                               \
46         }                                               \
47         current->state = TASK_RUNNING;                  \
48         remove_wait_queue(&wq, &__wait);                \
49 } while (0)
50
51 #endif                          /* _H_JFS_LOCK */