LXR linux/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
  31typedef 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
  42static 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__ */
  74