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/*
* Copyright (c) 2000 Silicon Graphics, Inc. All Rights Reserved.
*
* This program is free software; you can redistribute it and/or modify it
* under the terms of version 2 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.
*
* Further, this software is distributed without any warranty that it is
* free of the rightful claim of any third person regarding infringement
* or the like. Any license provided herein, whether implied or
* otherwise, applies only to this software file. Patent licenses, if
* any, provided herein do not apply to combinations of this program with
* other software, or any other product whatsoever.
*
* You should have received a copy of the GNU General Public License along
* with this program; if not, write the Free Software Foundation, Inc., 59
* Temple Place - Suite 330, Boston MA 02111-1307, USA.
*
* Contact information: Silicon Graphics, Inc., 1600 Amphitheatre Pkwy,
* Mountain View, CA 94043, or:
*
* http://www.sgi.com
*
* For further information regarding this notice, see:
*
* http://oss.sgi.com/projects/GenInfo/SGIGPLNoticeExplan/
*/
#ifndef __XFS_SUPPORT_SEMA_H__
#define __XFS_SUPPORT_SEMA_H__
#include <linux/version.h>
#include <linux/time.h>
#include <linux/wait.h>
#include <asm/atomic.h>
#include <asm/semaphore.h>
/*
* sema_t structure just maps to struct semaphore in Linux kernel.
*/
typedef struct semaphore sema_t;
#define init_sema(sp, val, c, d) sema_init(sp, val)
#define initsema(sp, val) sema_init(sp, val)
#define initnsema(sp, val, name) sema_init(sp, val)
#define psema(sp, b) down(sp)
#define vsema(sp) up(sp)
#define valusema(sp) (atomic_read(&(sp)->count))
#define freesema(sema)
/*
* Map cpsema (try to get the sema) to down_trylock. We need to switch
* the return values since cpsema returns 1 (acquired) 0 (failed) and
* down_trylock returns the reverse 0 (acquired) 1 (failed).
*/
#define cpsema(sp) (down_trylock(sp) ? 0 : 1)
/*
* Didn't do cvsema(sp). Not sure how to map this to up/down/...
* It does a vsema if the values is < 0 other wise nothing.
*/
#endif /* __XFS_SUPPORT_SEMA_H__ */
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