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 */