| Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 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__ */ |