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 */
52
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