Root/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/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) \
36do { \
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

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