fs/xfs/linux-2.6/sv.h

   1 /*
   2  * Copyright (c) 2000-2002 Silicon Graphics, Inc.  All Rights Reserved.
   3  *
   4  * This program is free software; you can redistribute it and/or modify it
   5  * under the terms of version 2 of the GNU General Public License as
   6  * published by the Free Software Foundation.
   7  *
   8  * This program is distributed in the hope that it would be useful, but
   9  * WITHOUT ANY WARRANTY; without even the implied warranty of
  10  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
  11  *
  12  * Further, this software is distributed without any warranty that it is
  13  * free of the rightful claim of any third person regarding infringement
  14  * or the like.  Any license provided herein, whether implied or
  15  * otherwise, applies only to this software file.  Patent licenses, if
  16  * any, provided herein do not apply to combinations of this program with
  17  * other software, or any other product whatsoever.
  18  *
  19  * You should have received a copy of the GNU General Public License along
  20  * with this program; if not, write the Free Software Foundation, Inc., 59
  21  * Temple Place - Suite 330, Boston MA 02111-1307, USA.
  22  *
  23  * Contact information: Silicon Graphics, Inc., 1600 Amphitheatre Pkwy,
  24  * Mountain View, CA  94043, or:
  25  *
  26  * http://www.sgi.com
  27  *
  28  * For further information regarding this notice, see:
  29  *
  30  * http://oss.sgi.com/projects/GenInfo/SGIGPLNoticeExplan/
  31  */
  32 #ifndef __XFS_SUPPORT_SV_H__
  33 #define __XFS_SUPPORT_SV_H__
  34
  35 #include <linux/wait.h>
  36 #include <linux/sched.h>
  37 #include <linux/spinlock.h>
  38
  39 /*
  40  * Synchronisation variables.
  41  *
  42  * (Parameters "pri", "svf" and "rts" are not implemented)
  43  */
  44
  45 typedef struct sv_s {
  46         wait_queue_head_t waiters;
  47 } sv_t;
  48
  49 #define SV_FIFO         0x0             /* sv_t is FIFO type */
  50 #define SV_LIFO         0x2             /* sv_t is LIFO type */
  51 #define SV_PRIO         0x4             /* sv_t is PRIO type */
  52 #define SV_KEYED        0x6             /* sv_t is KEYED type */
  53 #define SV_DEFAULT      SV_FIFO
  54
  55
  56 static inline void _sv_wait(sv_t *sv, spinlock_t *lock, int state,
  57                              unsigned long timeout)
  58 {
  59         DECLARE_WAITQUEUE(wait, current);
  60
  61         add_wait_queue_exclusive(&sv->waiters, &wait);
  62         __set_current_state(state);
  63         spin_unlock(lock);
  64
  65         schedule_timeout(timeout);
  66
  67         remove_wait_queue(&sv->waiters, &wait);
  68 }
  69
  70 #define init_sv(sv,type,name,flag) \
  71         init_waitqueue_head(&(sv)->waiters)
  72 #define sv_init(sv,flag,name) \
  73         init_waitqueue_head(&(sv)->waiters)
  74 #define sv_destroy(sv) \
  75         /*NOTHING*/
  76 #define sv_wait(sv, pri, lock, s) \
  77         _sv_wait(sv, lock, TASK_UNINTERRUPTIBLE, MAX_SCHEDULE_TIMEOUT)
  78 #define sv_wait_sig(sv, pri, lock, s)   \
  79         _sv_wait(sv, lock, TASK_INTERRUPTIBLE, MAX_SCHEDULE_TIMEOUT)
  80 #define sv_timedwait(sv, pri, lock, s, svf, ts, rts) \
  81         _sv_wait(sv, lock, TASK_UNINTERRUPTIBLE, timespec_to_jiffies(ts))
  82 #define sv_timedwait_sig(sv, pri, lock, s, svf, ts, rts) \
  83         _sv_wait(sv, lock, TASK_INTERRUPTIBLE, timespec_to_jiffies(ts))
  84 #define sv_signal(sv) \
  85         wake_up(&(sv)->waiters)
  86 #define sv_broadcast(sv) \
  87         wake_up_all(&(sv)->waiters)
  88
  89 #endif /* __XFS_SUPPORT_SV_H__ */