fs/xfs/linux-2.6/mutex.h

   1 /*
   2  * Copyright (c) 2000-2003 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_MUTEX_H__
  33 #define __XFS_SUPPORT_MUTEX_H__
  34
  35 #include <linux/spinlock.h>
  36 #include <asm/semaphore.h>
  37
  38 /*
  39  * Map the mutex'es from IRIX to Linux semaphores.
  40  *
  41  * Destroy just simply initializes to -99 which should block all other
  42  * callers.
  43  */
  44 #define MUTEX_DEFAULT           0x0
  45 typedef struct semaphore        mutex_t;
  46
  47 #define mutex_init(lock, type, name)            sema_init(lock, 1)
  48 #define mutex_destroy(lock)                     sema_init(lock, -99)
  49 #define mutex_lock(lock, num)                   down(lock)
  50 #define mutex_trylock(lock)                     (down_trylock(lock) ? 0 : 1)
  51 #define mutex_unlock(lock)                      up(lock)
  52
  53 #endif /* __XFS_SUPPORT_MUTEX_H__ */