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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_SV_H__ | |
19 | #define __XFS_SUPPORT_SV_H__ | |
20 | ||
21 | #include <linux/wait.h> | |
22 | #include <linux/sched.h> | |
23 | #include <linux/spinlock.h> | |
24 | ||
25 | /* | |
26 | * Synchronisation variables. | |
27 | * | |
28 | * (Parameters "pri", "svf" and "rts" are not implemented) | |
29 | */ | |
30 | ||
31 | typedef struct sv_s { | |
32 | wait_queue_head_t waiters; | |
33 | } sv_t; | |
34 | ||
35 | #define SV_FIFO 0x0 /* sv_t is FIFO type */ | |
36 | #define SV_LIFO 0x2 /* sv_t is LIFO type */ | |
37 | #define SV_PRIO 0x4 /* sv_t is PRIO type */ | |
38 | #define SV_KEYED 0x6 /* sv_t is KEYED type */ | |
39 | #define SV_DEFAULT SV_FIFO | |
40 | ||
41 | ||
42 | static inline void _sv_wait(sv_t *sv, spinlock_t *lock, int state, | |
43 | unsigned long timeout) | |
44 | { | |
45 | DECLARE_WAITQUEUE(wait, current); | |
46 | ||
47 | add_wait_queue_exclusive(&sv->waiters, &wait); | |
48 | __set_current_state(state); | |
49 | spin_unlock(lock); | |
50 | ||
51 | schedule_timeout(timeout); | |
52 | ||
53 | remove_wait_queue(&sv->waiters, &wait); | |
54 | } | |
55 | ||
56 | #define init_sv(sv,type,name,flag) \ | |
57 | init_waitqueue_head(&(sv)->waiters) | |
58 | #define sv_init(sv,flag,name) \ | |
59 | init_waitqueue_head(&(sv)->waiters) | |
60 | #define sv_destroy(sv) \ | |
61 | /*NOTHING*/ | |
62 | #define sv_wait(sv, pri, lock, s) \ | |
63 | _sv_wait(sv, lock, TASK_UNINTERRUPTIBLE, MAX_SCHEDULE_TIMEOUT) | |
64 | #define sv_wait_sig(sv, pri, lock, s) \ | |
65 | _sv_wait(sv, lock, TASK_INTERRUPTIBLE, MAX_SCHEDULE_TIMEOUT) | |
66 | #define sv_timedwait(sv, pri, lock, s, svf, ts, rts) \ | |
67 | _sv_wait(sv, lock, TASK_UNINTERRUPTIBLE, timespec_to_jiffies(ts)) | |
68 | #define sv_timedwait_sig(sv, pri, lock, s, svf, ts, rts) \ | |
69 | _sv_wait(sv, lock, TASK_INTERRUPTIBLE, timespec_to_jiffies(ts)) | |
70 | #define sv_signal(sv) \ | |
71 | wake_up(&(sv)->waiters) | |
72 | #define sv_broadcast(sv) \ | |
73 | wake_up_all(&(sv)->waiters) | |
74 | ||
75 | #endif /* __XFS_SUPPORT_SV_H__ */ |