sv.h

来自「linux-2.6.15.6」· C头文件 代码 · 共 76 行

/*
 * 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 init_sv(sv,type,name,flag) \
	init_waitqueue_head(&(sv)->waiters)
#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__ */