root/fs/xfs/linux-2.6/sv.h

INCLUDED FROM

DEFINITIONS

1. _sv_wait

/*
 * Copyright (c) 2000-2002,2005 Silicon Graphics, Inc.
 * All Rights Reserved.
 *
 * This program is free software; you can redistribute it and/or
 * modify it under the terms of the GNU General Public License as
 * published by the Free Software Foundation.
 *
 * This program is distributed in the hope that it would be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, write the Free Software Foundation,
 * Inc.,  51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA
 */
#ifndef __XFS_SUPPORT_SV_H__
#define __XFS_SUPPORT_SV_H__

#include <linux/wait.h>
#include <linux/sched.h>
#include <linux/spinlock.h>

/*
 * Synchronisation variables.
 *
 * (Parameters "pri", "svf" and "rts" are not implemented)
 */

typedef struct sv_s {
        wait_queue_head_t waiters;
} sv_t;

#define SV_FIFO         0x0             /* sv_t is FIFO type */
#define SV_LIFO         0x2             /* sv_t is LIFO type */
#define SV_PRIO         0x4             /* sv_t is PRIO type */
#define SV_KEYED        0x6             /* sv_t is KEYED type */
#define SV_DEFAULT      SV_FIFO


static inline void _sv_wait(sv_t *sv, spinlock_t *lock, int state,
                             unsigned long timeout)
{
        DECLARE_WAITQUEUE(wait, current);

        add_wait_queue_exclusive(&sv->waiters, &wait);
        __set_current_state(state);
        spin_unlock(lock);

        schedule_timeout(timeout);

        remove_wait_queue(&sv->waiters, &wait);
}

#define sv_init(sv,flag,name) \
        init_waitqueue_head(&(sv)->waiters)
#define sv_destroy(sv) \
        /*NOTHING*/
#define sv_wait(sv, pri, lock, s) \
        _sv_wait(sv, lock, TASK_UNINTERRUPTIBLE, MAX_SCHEDULE_TIMEOUT)
#define sv_wait_sig(sv, pri, lock, s)   \
        _sv_wait(sv, lock, TASK_INTERRUPTIBLE, MAX_SCHEDULE_TIMEOUT)
#define sv_timedwait(sv, pri, lock, s, svf, ts, rts) \
        _sv_wait(sv, lock, TASK_UNINTERRUPTIBLE, timespec_to_jiffies(ts))
#define sv_timedwait_sig(sv, pri, lock, s, svf, ts, rts) \
        _sv_wait(sv, lock, TASK_INTERRUPTIBLE, timespec_to_jiffies(ts))
#define sv_signal(sv) \
        wake_up(&(sv)->waiters)
#define sv_broadcast(sv) \
        wake_up_all(&(sv)->waiters)

#endif /* __XFS_SUPPORT_SV_H__ */