1 /*
2 * Copyright (c) 2000-2002,2005 Silicon Graphics, Inc.
3 * All Rights Reserved.
4 *
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
7 * published by the Free Software Foundation.
8 *
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.
13 *
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
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 sv_init(sv,flag,name) \
57 init_waitqueue_head(&(sv)->waiters)
58 #define sv_destroy(sv) \
59 /*NOTHING*/
60 #define sv_wait(sv, pri, lock, s) \
61 _sv_wait(sv, lock, TASK_UNINTERRUPTIBLE, MAX_SCHEDULE_TIMEOUT)
62 #define sv_wait_sig(sv, pri, lock, s) \
63 _sv_wait(sv, lock, TASK_INTERRUPTIBLE, MAX_SCHEDULE_TIMEOUT)
64 #define sv_timedwait(sv, pri, lock, s, svf, ts, rts) \
65 _sv_wait(sv, lock, TASK_UNINTERRUPTIBLE, timespec_to_jiffies(ts))
66 #define sv_timedwait_sig(sv, pri, lock, s, svf, ts, rts) \
67 _sv_wait(sv, lock, TASK_INTERRUPTIBLE, timespec_to_jiffies(ts))
68 #define sv_signal(sv) \
69 wake_up(&(sv)->waiters)
70 #define sv_broadcast(sv) \
71 wake_up_all(&(sv)->waiters)
72
73 #endif /* __XFS_SUPPORT_SV_H__ */
74
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