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
31typedef 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
42static 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