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phoenix |
/*
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* Copyright (c) 2000-2002 Silicon Graphics, Inc. All Rights Reserved.
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*
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* This program is free software; you can redistribute it and/or modify it
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* under the terms of version 2 of the GNU General Public License as
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* published by the Free Software Foundation.
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*
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* This program is distributed in the hope that it would be useful, but
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* WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
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*
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* Further, this software is distributed without any warranty that it is
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* free of the rightful claim of any third person regarding infringement
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* or the like. Any license provided herein, whether implied or
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* otherwise, applies only to this software file. Patent licenses, if
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* any, provided herein do not apply to combinations of this program with
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* other software, or any other product whatsoever.
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*
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* You should have received a copy of the GNU General Public License along
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* with this program; if not, write the Free Software Foundation, Inc., 59
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* Temple Place - Suite 330, Boston MA 02111-1307, USA.
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*
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* Contact information: Silicon Graphics, Inc., 1600 Amphitheatre Pkwy,
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* Mountain View, CA 94043, or:
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*
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* http://www.sgi.com
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*
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* For further information regarding this notice, see:
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*
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* http://oss.sgi.com/projects/GenInfo/SGIGPLNoticeExplan/
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*/
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#ifndef __XFS_SUPPORT_SEMA_H__
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#define __XFS_SUPPORT_SEMA_H__
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#include <linux/time.h>
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#include <linux/wait.h>
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#include <asm/atomic.h>
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#include <asm/semaphore.h>
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/*
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* sema_t structure just maps to struct semaphore in Linux kernel.
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*/
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typedef struct semaphore sema_t;
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#define init_sema(sp, val, c, d) sema_init(sp, val)
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#define initsema(sp, val) sema_init(sp, val)
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#define initnsema(sp, val, name) sema_init(sp, val)
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#define psema(sp, b) down(sp)
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#define vsema(sp) up(sp)
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#define valusema(sp) (atomic_read(&(sp)->count))
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#define freesema(sema)
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/*
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* Map cpsema (try to get the sema) to down_trylock. We need to switch
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* the return values since cpsema returns 1 (acquired) 0 (failed) and
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* down_trylock returns the reverse 0 (acquired) 1 (failed).
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*/
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#define cpsema(sp) (down_trylock(sp) ? 0 : 1)
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/*
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* Didn't do cvsema(sp). Not sure how to map this to up/down/...
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* It does a vsema if the values is < 0 other wise nothing.
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*/
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#endif /* __XFS_SUPPORT_SEMA_H__ */
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