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 #define SV_FIFO         0x0             /* sv_t is FIFO type */
  36 #define SV_LIFO         0x2             /* sv_t is LIFO type */
  37 #define SV_PRIO         0x4             /* sv_t is PRIO type */
  38 #define SV_KEYED        0x6             /* sv_t is KEYED type */
  39 #define SV_DEFAULT      SV_FIFO
  40
  41
  42 static inline void _sv_wait(sv_t *sv, spinlock_t *lock, int state,
  43                              unsigned long timeout)
  44 {
  45         DECLARE_WAITQUEUE(wait, current);
  46
  47         add_wait_queue_exclusive(&sv->waiters, &wait);
  48         __set_current_state(state);
  49         spin_unlock(lock);
  50
  51         schedule_timeout(timeout);
  52
  53         remove_wait_queue(&sv->waiters, &wait);
  54 }
  55
  56 #define sv_init(sv,flag,name) \
  57         init_waitqueue_head(&(sv)->waiters)
  58 #define sv_destroy(sv) \
  59         /*NOTHING*/
  60 #define sv_wait(sv, pri, lock, s) \
  61         _sv_wait(sv, lock, TASK_UNINTERRUPTIBLE, MAX_SCHEDULE_TIMEOUT)
  62 #define sv_wait_sig(sv, pri, lock, s)   \
  63         _sv_wait(sv, lock, TASK_INTERRUPTIBLE, MAX_SCHEDULE_TIMEOUT)
  64 #define sv_timedwait(sv, pri, lock, s, svf, ts, rts) \
  65         _sv_wait(sv, lock, TASK_UNINTERRUPTIBLE, timespec_to_jiffies(ts))
  66 #define sv_timedwait_sig(sv, pri, lock, s, svf, ts, rts) \
  67         _sv_wait(sv, lock, TASK_INTERRUPTIBLE, timespec_to_jiffies(ts))
  68 #define sv_signal(sv) \
  69         wake_up(&(sv)->waiters)
  70 #define sv_broadcast(sv) \
  71         wake_up_all(&(sv)->waiters)
  72
  73 #endif /* __XFS_SUPPORT_SV_H__ */