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

/*
 * 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;

static inline void _sv_wait(sv_t *sv, spinlock_t *lock)
{
	DECLARE_WAITQUEUE(wait, current);

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

	schedule();

	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)
#define sv_signal(sv) \
	wake_up(&(sv)->waiters)
#define sv_broadcast(sv) \
	wake_up_all(&(sv)->waiters)

#endif /* __XFS_SUPPORT_SV_H__ */