kernel/2.6.29.6-aldebaran-rt/fs/xfs/linux-2.6/sv.h

   1 /*
   2  * Copyright (c) 2000-2002,2005 Silicon Graphics, Inc.
   3  * All Rights Reserved.
   4  *
   5  * This program is free software; you can redistribute it and/or
   6  * modify it under the terms of the GNU General Public License as
   7  * published by the Free Software Foundation.
   8  *
   9  * This program is distributed in the hope that it would be useful,
  10  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  11  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  12  * GNU General Public License for more details.
  13  *
  14  * You should have received a copy of the GNU General Public License
  15  * along with this program; if not, write the Free Software Foundation,
  16  * Inc.,  51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA
  17  */
  18 #ifndef __XFS_SUPPORT_SV_H__
  19 #define __XFS_SUPPORT_SV_H__
  20
  21 #include <linux/wait.h>
  22 #include <linux/sched.h>
  23 #include <linux/spinlock.h>
  24
  25 /*
  26  * Synchronisation variables.
  27  *
  28  * (Parameters "pri", "svf" and "rts" are not implemented)
  29  */
  30
  31 typedef struct sv_s {
  32         wait_queue_head_t waiters;
  33 } sv_t;
  34
  35 static inline void _sv_wait(sv_t *sv, spinlock_t *lock)
  36 {
  37         DECLARE_WAITQUEUE(wait, current);
  38
  39         add_wait_queue_exclusive(&sv->waiters, &wait);
  40         __set_current_state(TASK_UNINTERRUPTIBLE);
  41         spin_unlock(lock);
  42
  43         schedule();
  44
  45         remove_wait_queue(&sv->waiters, &wait);
  46 }
  47
  48 #define sv_init(sv,flag,name) \
  49         init_waitqueue_head(&(sv)->waiters)
  50 #define sv_destroy(sv) \
  51         /*NOTHING*/
  52 #define sv_wait(sv, pri, lock, s) \
  53         _sv_wait(sv, lock)
  54 #define sv_signal(sv) \
  55         wake_up(&(sv)->waiters)
  56 #define sv_broadcast(sv) \
  57         wake_up_all(&(sv)->waiters)
  58
  59 #endif /* __XFS_SUPPORT_SV_H__ */