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1da177e4 | 1 | /* |
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2 | * Copyright (c) 2000-2002,2005 Silicon Graphics, Inc. |
3 | * All Rights Reserved. | |
1da177e4 | 4 | * |
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5 | * This program is free software; you can redistribute it and/or |
6 | * modify it under the terms of the GNU General Public License as | |
1da177e4 LT |
7 | * published by the Free Software Foundation. |
8 | * | |
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9 | * This program is distributed in the hope that it would be useful, |
10 | * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
11 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
12 | * GNU General Public License for more details. | |
1da177e4 | 13 | * |
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14 | * You should have received a copy of the GNU General Public License |
15 | * along with this program; if not, write the Free Software Foundation, | |
16 | * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA | |
1da177e4 LT |
17 | */ |
18 | #ifndef __XFS_SUPPORT_SEMA_H__ | |
19 | #define __XFS_SUPPORT_SEMA_H__ | |
20 | ||
21 | #include <linux/time.h> | |
22 | #include <linux/wait.h> | |
23 | #include <asm/atomic.h> | |
24 | #include <asm/semaphore.h> | |
25 | ||
26 | /* | |
27 | * sema_t structure just maps to struct semaphore in Linux kernel. | |
28 | */ | |
29 | ||
30 | typedef struct semaphore sema_t; | |
31 | ||
1da177e4 LT |
32 | #define initnsema(sp, val, name) sema_init(sp, val) |
33 | #define psema(sp, b) down(sp) | |
34 | #define vsema(sp) up(sp) | |
0d8fee32 AV |
35 | #define freesema(sema) do { } while (0) |
36 | ||
37 | static inline int issemalocked(sema_t *sp) | |
38 | { | |
39 | return down_trylock(sp) || (up(sp), 0); | |
40 | } | |
1da177e4 LT |
41 | |
42 | /* | |
43 | * Map cpsema (try to get the sema) to down_trylock. We need to switch | |
44 | * the return values since cpsema returns 1 (acquired) 0 (failed) and | |
45 | * down_trylock returns the reverse 0 (acquired) 1 (failed). | |
46 | */ | |
0d8fee32 AV |
47 | static inline int cpsema(sema_t *sp) |
48 | { | |
49 | return down_trylock(sp) ? 0 : 1; | |
50 | } | |
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51 | |
52 | #endif /* __XFS_SUPPORT_SEMA_H__ */ |