wait.h revision 219820 
1/*-
2 * Copyright (c) 2010 Isilon Systems, Inc.
3 * Copyright (c) 2010 iX Systems, Inc.
4 * Copyright (c) 2010 Panasas, Inc.
5 * All rights reserved.
6 *
7 * Redistribution and use in source and binary forms, with or without
8 * modification, are permitted provided that the following conditions
9 * are met:
10 * 1. Redistributions of source code must retain the above copyright
11 *    notice unmodified, this list of conditions, and the following
12 *    disclaimer.
13 * 2. Redistributions in binary form must reproduce the above copyright
14 *    notice, this list of conditions and the following disclaimer in the
15 *    documentation and/or other materials provided with the distribution.
16 *
17 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
18 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
19 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
20 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
21 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
22 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
23 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
24 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
25 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
26 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
27 */
28#ifndef	_LINUX_WAIT_H_
29#define	_LINUX_WAIT_H_
30
31#include <linux/spinlock.h>
32#include <linux/sched.h>
33#include <linux/list.h>
34
35#include <sys/param.h>
36#include <sys/systm.h>
37#include <sys/sleepqueue.h>
38#include <sys/kernel.h>
39#include <sys/proc.h>
40
41struct __wait_queue_head {
42	unsigned int	wchan;
43};
44typedef struct __wait_queue_head wait_queue_head_t;
45
46#define	init_waitqueue_head(x)
47
48static inline void
49__wake_up(struct __wait_queue_head *q, int all)
50{
51	int wakeup_swapper;
52	void *c;
53
54	c = &q->wchan;
55	sleepq_lock(c);
56	if (all)
57		wakeup_swapper = sleepq_broadcast(c, SLEEPQ_SLEEP, 0, 0);
58	else
59		wakeup_swapper = sleepq_signal(c, SLEEPQ_SLEEP, 0, 0);
60	sleepq_release(c);
61	if (wakeup_swapper)
62		kick_proc0();
63}
64
65#define	wake_up(q)				__wake_up(q, 0)
66#define	wake_up_nr(q, nr)			__wake_up(q, 1)
67#define	wake_up_all(q)				__wake_up(q, 1)
68#define	wake_up_interruptible(q)		__wake_up(q, 0)
69#define	wake_up_interruptible_nr(q, nr)		__wake_up(q, 1)
70#define	wake_up_interruptible_all(q, nr)	__wake_up(q, 1)
71
72#define	wait_event(q, cond)						\
73do {									\
74	void *c = &(q).wchan;						\
75	if (!(cond)) {							\
76		for (;;) {						\
77			sleepq_lock(c);					\
78			if (cond) {					\
79				sleepq_release(c);			\
80				break;					\
81			}						\
82			sleepq_add(c, NULL, "completion", SLEEPQ_SLEEP, 0); \
83			sleepq_wait(c, 0);				\
84		}							\
85	}								\
86} while (0)
87
88#define	wait_event_interruptible(q, cond)				\
89({									\
90	void *c = &(q).wchan;						\
91	int _error;							\
92									\
93	_error = 0;							\
94	if (!(cond)) {							\
95		for (; _error == 0;) {					\
96			sleepq_lock(c);					\
97			if (cond) {					\
98				sleepq_release(c);			\
99				break;					\
100			}						\
101			sleepq_add(c, NULL, "completion",		\
102			    SLEEPQ_SLEEP | SLEEPQ_INTERRUPTIBLE, 0);	\
103			if (sleepq_wait_sig(c, 0))			\
104				_error = -ERESTARTSYS;			\
105		}							\
106	}								\
107	-_error;							\
108})
109
110#define	DEFINE_WAIT(x)
111
112#endif	/* _LINUX_WAIT_H_ */
113