sched.h revision 1.11 
1/*	$NetBSD: sched.h,v 1.11 2018/10/23 03:56:33 riastradh Exp $	*/
2
3/*-
4 * Copyright (c) 2013 The NetBSD Foundation, Inc.
5 * All rights reserved.
6 *
7 * This code is derived from software contributed to The NetBSD Foundation
8 * by Taylor R. Campbell.
9 *
10 * Redistribution and use in source and binary forms, with or without
11 * modification, are permitted provided that the following conditions
12 * are met:
13 * 1. Redistributions of source code must retain the above copyright
14 *    notice, this list of conditions and the following 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 NETBSD FOUNDATION, INC. AND CONTRIBUTORS
20 * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
21 * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
22 * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
23 * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
24 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
25 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
26 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
27 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
28 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
29 * POSSIBILITY OF SUCH DAMAGE.
30 */
31
32#ifndef _LINUX_SCHED_H_
33#define _LINUX_SCHED_H_
34
35#include <sys/param.h>
36#include <sys/kernel.h>
37#include <sys/proc.h>
38
39#include <asm/param.h>
40#include <asm/barrier.h>
41#include <asm/processor.h>
42#include <linux/errno.h>
43
44#define	TASK_COMM_LEN	MAXCOMLEN
45
46#define	MAX_SCHEDULE_TIMEOUT	(INT_MAX/2)	/* paranoia */
47
48#define	current	curproc
49
50static inline pid_t
51task_pid_nr(struct proc *p)
52{
53	return p->p_pid;
54}
55
56static inline long
57schedule_timeout_uninterruptible(long timeout)
58{
59	long remain;
60	int start, end;
61
62	if (cold) {
63		unsigned us;
64		if (hz <= 1000) {
65			unsigned ms = hztoms(MIN(timeout, mstohz(INT_MAX)));
66			us = MIN(ms, INT_MAX/1000)*1000;
67		} else if (hz <= 1000000) {
68			us = MIN(timeout, (INT_MAX/1000000)/hz)*hz*1000000;
69		} else {
70			us = timeout/(1000000/hz);
71		}
72		DELAY(us);
73		return 0;
74	}
75
76	start = hardclock_ticks;
77	/* XXX Integer truncation...not likely to matter here.  */
78	(void)kpause("loonix", false /*!intr*/, timeout, NULL);
79	end = hardclock_ticks;
80
81	remain = timeout - (end - start);
82	return remain > 0 ? remain : 0;
83}
84
85static inline void
86cond_resched(void)
87{
88
89	if (curcpu()->ci_schedstate.spc_flags & SPCF_SHOULDYIELD)
90		preempt();
91}
92
93#endif  /* _LINUX_SCHED_H_ */
94