linux/fs/jfs/jfs_lock.h
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   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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