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_SEMA_H__ 33 #define __XFS_SUPPORT_SEMA_H__ 34 35 #include <linux/time.h> 36 #include <linux/wait.h> 37 #include <asm/atomic.h> 38 #include <asm/semaphore.h> 39 40 /* 41 * sema_t structure just maps to struct semaphore in Linux kernel. 42 */ 43 44 typedef struct semaphore sema_t; 45 46 #define init_sema(sp, val, c, d) sema_init(sp, val) 47 #define initsema(sp, val) sema_init(sp, val) 48 #define initnsema(sp, val, name) sema_init(sp, val) 49 #define psema(sp, b) down(sp) 50 #define vsema(sp) up(sp) 51 #define valusema(sp) (atomic_read(&(sp)->count)) 52 #define freesema(sema) 53 54 /* 55 * Map cpsema (try to get the sema) to down_trylock. We need to switch 56 * the return values since cpsema returns 1 (acquired) 0 (failed) and 57 * down_trylock returns the reverse 0 (acquired) 1 (failed). 58 */ 59 60 #define cpsema(sp) (down_trylock(sp) ? 0 : 1) 61 62 /* 63 * Didn't do cvsema(sp). Not sure how to map this to up/down/... 64 * It does a vsema if the values is < 0 other wise nothing. 65 */ 66 67 #endif /* __XFS_SUPPORT_SEMA_H__ */ 68