| /* |
| * Copyright (c) 2000-2002,2005 Silicon Graphics, Inc. |
| * All Rights Reserved. |
| * |
| * This program is free software; you can redistribute it and/or |
| * modify it under the terms 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. See the |
| * GNU General Public License for more details. |
| * |
| * You should have received a copy of the GNU General Public License |
| * along with this program; if not, write the Free Software Foundation, |
| * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA |
| */ |
| #ifndef __XFS_SUPPORT_SEMA_H__ |
| #define __XFS_SUPPORT_SEMA_H__ |
| |
| #include <linux/time.h> |
| #include <linux/wait.h> |
| #include <linux/semaphore.h> |
| #include <asm/atomic.h> |
| |
| /* |
| * sema_t structure just maps to struct semaphore in Linux kernel. |
| */ |
| |
| typedef struct semaphore sema_t; |
| |
| #define initnsema(sp, val, name) sema_init(sp, val) |
| #define psema(sp, b) down(sp) |
| #define vsema(sp) up(sp) |
| #define freesema(sema) do { } while (0) |
| |
| static inline int issemalocked(sema_t *sp) |
| { |
| return down_trylock(sp) || (up(sp), 0); |
| } |
| |
| /* |
| * 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). |
| */ |
| static inline int cpsema(sema_t *sp) |
| { |
| return down_trylock(sp) ? 0 : 1; |
| } |
| |
| #endif /* __XFS_SUPPORT_SEMA_H__ */ |