/* * Copyright (c) 2000-2002 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/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__ */