1 /*
2 * Copyright (c) 2000-2002 Silicon Graphics, Inc. All Rights Reserved.
3 *
4 * This program is free software; you can redistribute it and/or modify it
5 * under the terms of version 2 of the GNU General Public License as
6 * published by the Free Software Foundation.
7 *
8 * This program is distributed in the hope that it would be useful, but
9 * WITHOUT ANY WARRANTY; without even the implied warranty of
10 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
11 *
12 * Further, this software is distributed without any warranty that it is
13 * free of the rightful claim of any third person regarding infringement
14 * or the like. Any license provided herein, whether implied or
15 * otherwise, applies only to this software file. Patent licenses, if
16 * any, provided herein do not apply to combinations of this program with
17 * other software, or any other product whatsoever.
18 *
19 * You should have received a copy of the GNU General Public License along
20 * with this program; if not, write the Free Software Foundation, Inc., 59
21 * Temple Place - Suite 330, Boston MA 02111-1307, USA.
22 *
23 * Contact information: Silicon Graphics, Inc., 1600 Amphitheatre Pkwy,
24 * Mountain View, CA 94043, or:
25 *
26 * http://www.sgi.com
27 *
28 * For further information regarding this notice, see:
29 *
30 * http://oss.sgi.com/projects/GenInfo/SGIGPLNoticeExplan/
31 */
32 #ifndef __XFS_SUPPORT_SV_H__
33 #define __XFS_SUPPORT_SV_H__
34
35 #include <linux/wait.h>
36 #include <linux/sched.h>
37 #include <linux/spinlock.h>
38
39 /*
40 * Synchronisation variables.
41 *
42 * (Parameters "pri", "svf" and "rts" are not implemented)
43 */
44
45 typedef struct sv_s {
46 wait_queue_head_t waiters;
47 } sv_t;
48
49 #define SV_FIFO 0x0 /* sv_t is FIFO type */
50 #define SV_LIFO 0x2 /* sv_t is LIFO type */
51 #define SV_PRIO 0x4 /* sv_t is PRIO type */
52 #define SV_KEYED 0x6 /* sv_t is KEYED type */
53 #define SV_DEFAULT SV_FIFO
54
55
_sv_wait(sv_t * sv,spinlock_t * lock,int state,unsigned long timeout)56 static inline void _sv_wait(sv_t *sv, spinlock_t *lock, int state,
57 unsigned long timeout)
58 {
59 DECLARE_WAITQUEUE(wait, current);
60
61 add_wait_queue_exclusive(&sv->waiters, &wait);
62 __set_current_state(state);
63 spin_unlock(lock);
64
65 schedule_timeout(timeout);
66
67 remove_wait_queue(&sv->waiters, &wait);
68 }
69
70 #define init_sv(sv,type,name,flag) \
71 init_waitqueue_head(&(sv)->waiters)
72 #define sv_init(sv,flag,name) \
73 init_waitqueue_head(&(sv)->waiters)
74 #define sv_destroy(sv) \
75 /*NOTHING*/
76 #define sv_wait(sv, pri, lock, s) \
77 _sv_wait(sv, lock, TASK_UNINTERRUPTIBLE, MAX_SCHEDULE_TIMEOUT)
78 #define sv_wait_sig(sv, pri, lock, s) \
79 _sv_wait(sv, lock, TASK_INTERRUPTIBLE, MAX_SCHEDULE_TIMEOUT)
80 #define sv_timedwait(sv, pri, lock, s, svf, ts, rts) \
81 _sv_wait(sv, lock, TASK_UNINTERRUPTIBLE, timespec_to_jiffies(ts))
82 #define sv_timedwait_sig(sv, pri, lock, s, svf, ts, rts) \
83 _sv_wait(sv, lock, TASK_INTERRUPTIBLE, timespec_to_jiffies(ts))
84 #define sv_signal(sv) \
85 wake_up(&(sv)->waiters)
86 #define sv_broadcast(sv) \
87 wake_up_all(&(sv)->waiters)
88
89 #endif /* __XFS_SUPPORT_SV_H__ */
90