sched.h revision 334761 
1/*-
2 * Copyright (c) 2010 Isilon Systems, Inc.
3 * Copyright (c) 2010 iX Systems, Inc.
4 * Copyright (c) 2010 Panasas, Inc.
5 * Copyright (c) 2013-2018 Mellanox Technologies, Ltd.
6 * All rights reserved.
7 *
8 * Redistribution and use in source and binary forms, with or without
9 * modification, are permitted provided that the following conditions
10 * are met:
11 * 1. Redistributions of source code must retain the above copyright
12 *    notice unmodified, this list of conditions, and the following
13 *    disclaimer.
14 * 2. Redistributions in binary form must reproduce the above copyright
15 *    notice, this list of conditions and the following disclaimer in the
16 *    documentation and/or other materials provided with the distribution.
17 *
18 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
19 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
20 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
21 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
22 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
23 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
24 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
25 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
26 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
27 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
28 *
29 * $FreeBSD: stable/11/sys/compat/linuxkpi/common/include/linux/sched.h 334761 2018-06-07 07:38:37Z hselasky $
30 */
31#ifndef	_LINUX_SCHED_H_
32#define	_LINUX_SCHED_H_
33
34#include <sys/param.h>
35#include <sys/systm.h>
36#include <sys/proc.h>
37#include <sys/sched.h>
38#include <sys/sleepqueue.h>
39#include <sys/time.h>
40
41#include <linux/bitmap.h>
42#include <linux/compat.h>
43#include <linux/completion.h>
44#include <linux/mm_types.h>
45#include <linux/pid.h>
46#include <linux/slab.h>
47#include <linux/string.h>
48#include <linux/time.h>
49
50#include <asm/atomic.h>
51
52#define	MAX_SCHEDULE_TIMEOUT	INT_MAX
53
54#define	TASK_RUNNING		0x0000
55#define	TASK_INTERRUPTIBLE	0x0001
56#define	TASK_UNINTERRUPTIBLE	0x0002
57#define	TASK_NORMAL		(TASK_INTERRUPTIBLE | TASK_UNINTERRUPTIBLE)
58#define	TASK_WAKING		0x0100
59#define	TASK_PARKED		0x0200
60
61#define	TASK_COMM_LEN		(MAXCOMLEN + 1)
62
63struct task_struct {
64	struct thread *task_thread;
65	struct mm_struct *mm;
66	linux_task_fn_t *task_fn;
67	void   *task_data;
68	int	task_ret;
69	atomic_t usage;
70	atomic_t state;
71	atomic_t kthread_flags;
72	pid_t	pid;	/* BSD thread ID */
73	const char    *comm;
74	void   *bsd_ioctl_data;
75	unsigned bsd_ioctl_len;
76	struct completion parked;
77	struct completion exited;
78	TAILQ_ENTRY(task_struct) rcu_entry;
79	int rcu_recurse;
80	int bsd_interrupt_value;
81};
82
83#define	current	({ \
84	struct thread *__td = curthread; \
85	linux_set_current(__td); \
86	((struct task_struct *)__td->td_lkpi_task); \
87})
88
89#define	task_pid_group_leader(task) (task)->task_thread->td_proc->p_pid
90#define	task_pid(task)		((task)->pid)
91#define	task_pid_nr(task)	((task)->pid)
92#define	get_pid(x)		(x)
93#define	put_pid(x)		do { } while (0)
94#define	current_euid()	(curthread->td_ucred->cr_uid)
95
96#define	set_task_state(task, x)		atomic_set(&(task)->state, (x))
97#define	__set_task_state(task, x)	((task)->state.counter = (x))
98#define	set_current_state(x)		set_task_state(current, x)
99#define	__set_current_state(x)		__set_task_state(current, x)
100
101static inline void
102get_task_struct(struct task_struct *task)
103{
104	atomic_inc(&task->usage);
105}
106
107static inline void
108put_task_struct(struct task_struct *task)
109{
110	if (atomic_dec_and_test(&task->usage))
111		linux_free_current(task);
112}
113
114#define	cond_resched()	do { if (!cold) sched_relinquish(curthread); } while (0)
115
116#define	yield()		kern_yield(PRI_UNCHANGED)
117#define	sched_yield()	sched_relinquish(curthread)
118
119#define	need_resched() (curthread->td_flags & TDF_NEEDRESCHED)
120
121bool linux_signal_pending(struct task_struct *task);
122bool linux_fatal_signal_pending(struct task_struct *task);
123bool linux_signal_pending_state(long state, struct task_struct *task);
124void linux_send_sig(int signo, struct task_struct *task);
125
126#define	signal_pending(task)		linux_signal_pending(task)
127#define	fatal_signal_pending(task)	linux_fatal_signal_pending(task)
128#define	signal_pending_state(state, task)		\
129	linux_signal_pending_state(state, task)
130#define	send_sig(signo, task, priv) do {		\
131	CTASSERT((priv) == 0);				\
132	linux_send_sig(signo, task);			\
133} while (0)
134
135int linux_schedule_timeout(int timeout);
136
137static inline void
138linux_schedule_save_interrupt_value(struct task_struct *task, int value)
139{
140	task->bsd_interrupt_value = value;
141}
142
143static inline int
144linux_schedule_get_interrupt_value(struct task_struct *task)
145{
146	int value = task->bsd_interrupt_value;
147	task->bsd_interrupt_value = 0;
148	return (value);
149}
150
151#define	schedule()					\
152	(void)linux_schedule_timeout(MAX_SCHEDULE_TIMEOUT)
153#define	schedule_timeout(timeout)			\
154	linux_schedule_timeout(timeout)
155#define	schedule_timeout_killable(timeout)		\
156	schedule_timeout_interruptible(timeout)
157#define	schedule_timeout_interruptible(timeout) ({	\
158	set_current_state(TASK_INTERRUPTIBLE);		\
159	schedule_timeout(timeout);			\
160})
161#define	schedule_timeout_uninterruptible(timeout) ({	\
162	set_current_state(TASK_UNINTERRUPTIBLE);	\
163	schedule_timeout(timeout);			\
164})
165
166#define	io_schedule()			schedule()
167#define	io_schedule_timeout(timeout)	schedule_timeout(timeout)
168
169static inline uint64_t
170local_clock(void)
171{
172	struct timespec ts;
173
174	nanotime(&ts);
175	return ((uint64_t)ts.tv_sec * NSEC_PER_SEC + ts.tv_nsec);
176}
177
178#endif	/* _LINUX_SCHED_H_ */
179