text: /*
   * 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__ */
  