sched.h revision 289624 
1/* $FreeBSD: head/sys/ofed/include/linux/sched.h 289624 2015-10-20 11:40:04Z hselasky $ */
2/*-
3 * Copyright (c) 2010 Isilon Systems, Inc.
4 * Copyright (c) 2010 iX Systems, Inc.
5 * Copyright (c) 2010 Panasas, Inc.
6 * Copyright (c) 2013, 2014 Mellanox Technologies, Ltd.
7 * All rights reserved.
8 *
9 * Redistribution and use in source and binary forms, with or without
10 * modification, are permitted provided that the following conditions
11 * are met:
12 * 1. Redistributions of source code must retain the above copyright
13 *    notice unmodified, this list of conditions, and the following
14 *    disclaimer.
15 * 2. Redistributions in binary form must reproduce the above copyright
16 *    notice, this list of conditions and the following disclaimer in the
17 *    documentation and/or other materials provided with the distribution.
18 *
19 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
20 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
21 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
22 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
23 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
24 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
25 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
26 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
27 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
28 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
29 */
30#ifndef	_LINUX_SCHED_H_
31#define	_LINUX_SCHED_H_
32
33#include <sys/param.h>
34#include <sys/systm.h>
35#include <sys/proc.h>
36#include <sys/sched.h>
37#include <sys/sleepqueue.h>
38
39#define	MAX_SCHEDULE_TIMEOUT	LONG_MAX
40
41#define	TASK_RUNNING		0
42#define	TASK_INTERRUPTIBLE	1
43#define	TASK_UNINTERRUPTIBLE	2
44#define	TASK_DEAD		64
45#define	TASK_WAKEKILL		128
46#define	TASK_WAKING		256
47
48#define	TASK_SHOULD_STOP	1
49#define	TASK_STOPPED		2
50
51/*
52 * A task_struct is only provided for those tasks created with kthread.
53 * Using these routines with threads not started via kthread will cause
54 * panics because no task_struct is allocated and td_retval[1] is
55 * overwritten by syscalls which kernel threads will not make use of.
56 */
57struct task_struct {
58	struct	thread *task_thread;
59	int	(*task_fn)(void *data);
60	void	*task_data;
61	int	task_ret;
62	int	state;
63	int	should_stop;
64};
65
66#define	current			((struct task_struct *)curthread->td_retval[1])
67#define	task_struct_get(x)	(struct task_struct *)(x)->td_retval[1]
68#define	task_struct_set(x, y)	(x)->td_retval[1] = (register_t)(y)
69
70#define	set_current_state(x)						\
71	atomic_store_rel_int((volatile int *)&current->state, (x))
72#define	__set_current_state(x)	current->state = (x)
73
74
75#define	schedule()							\
76do {									\
77	void *c;							\
78									\
79	if (cold)							\
80		break;							\
81	c = curthread;							\
82	sleepq_lock(c);							\
83	if (current->state == TASK_INTERRUPTIBLE ||			\
84	    current->state == TASK_UNINTERRUPTIBLE) {			\
85		sleepq_add(c, NULL, "task", SLEEPQ_SLEEP, 0);		\
86		sleepq_wait(c, 0);					\
87	} else {							\
88		sleepq_release(c);					\
89		sched_relinquish(curthread);				\
90	}								\
91} while (0)
92
93#define	wake_up_process(x)						\
94do {									\
95	int wakeup_swapper;						\
96	void *c;							\
97									\
98	c = (x)->task_thread;						\
99	sleepq_lock(c);							\
100	(x)->state = TASK_RUNNING;					\
101	wakeup_swapper = sleepq_signal(c, SLEEPQ_SLEEP, 0, 0);		\
102	sleepq_release(c);						\
103	if (wakeup_swapper)						\
104		kick_proc0();						\
105} while (0)
106
107#define	cond_resched()	if (!cold)	sched_relinquish(curthread)
108
109#define	sched_yield()	sched_relinquish(curthread)
110
111static inline long
112schedule_timeout(signed long timeout)
113{
114	if (timeout < 0)
115		return 0;
116
117	pause("lstim", timeout);
118
119	return 0;
120}
121
122#endif	/* _LINUX_SCHED_H_ */
123