1/*	$NetBSD: sched.c,v 1.6 2018/01/04 20:57:29 kamil Exp $	*/
2
3/*
4 * Copyright (c) 2008, Mindaugas Rasiukevicius <rmind at NetBSD org>
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, this list of conditions and the following disclaimer.
12 * 2. Redistributions in binary form must reproduce the above copyright
13 *    notice, this list of conditions and the following disclaimer in the
14 *    documentation and/or other materials provided with the distribution.
15 *
16 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
17 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
18 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
19 * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
20 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
21 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
22 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
23 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
24 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
25 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
26 * SUCH DAMAGE.
27 */
28
29#include <sys/cdefs.h>
30__RCSID("$NetBSD: sched.c,v 1.6 2018/01/04 20:57:29 kamil Exp $");
31
32#include "namespace.h"
33#include <string.h>
34#include <unistd.h>
35#include <errno.h>
36#include <sched.h>
37#include <signal.h>
38#include <sys/param.h>
39#include <sys/types.h>
40
41/* All LWPs in the process */
42#define	P_ALL_LWPS		0
43
44/*
45 * Scheduling parameters.
46 */
47
48int
49sched_setparam(pid_t pid, const struct sched_param *param)
50{
51	struct sched_param sp;
52
53	memset(&sp, 0, sizeof(struct sched_param));
54	sp.sched_priority = param->sched_priority;
55	return _sched_setparam(pid, P_ALL_LWPS, SCHED_NONE, &sp);
56}
57
58int
59sched_getparam(pid_t pid, struct sched_param *param)
60{
61
62	return _sched_getparam(pid, P_ALL_LWPS, NULL, param);
63}
64
65int
66sched_setscheduler(pid_t pid, int policy, const struct sched_param *param)
67{
68	struct sched_param sp;
69	int ret, old_policy;
70
71	ret = _sched_getparam(pid, P_ALL_LWPS, &old_policy, &sp);
72	if (ret < 0)
73		return ret;
74
75	memset(&sp, 0, sizeof(struct sched_param));
76	sp.sched_priority = param->sched_priority;
77	ret = _sched_setparam(pid, P_ALL_LWPS, policy, &sp);
78	if (ret < 0)
79		return ret;
80
81	return old_policy;
82}
83
84int
85sched_getscheduler(pid_t pid)
86{
87	struct sched_param sp;
88	int ret, policy;
89
90	ret = _sched_getparam(pid, P_ALL_LWPS, &policy, &sp);
91	if (ret < 0)
92		return ret;
93
94	return policy;
95}
96
97/*
98 * Scheduling priorities.
99 */
100
101int
102sched_get_priority_max(int policy)
103{
104
105	switch (policy) {
106	case SCHED_OTHER:
107		return PRI_NONE;
108	case SCHED_RR:
109	case SCHED_FIFO:
110		return (int)sysconf(_SC_SCHED_PRI_MAX);
111	default:
112		errno = EINVAL;
113		return -1;
114	}
115}
116
117int
118sched_get_priority_min(int policy)
119{
120
121	switch (policy) {
122	case SCHED_OTHER:
123		return PRI_NONE;
124	case SCHED_RR:
125	case SCHED_FIFO:
126		return (int)sysconf(_SC_SCHED_PRI_MIN);
127	default:
128		errno = EINVAL;
129		return -1;
130	}
131}
132
133int
134/*ARGSUSED*/
135sched_rr_get_interval(pid_t pid, struct timespec *interval)
136{
137
138	if (pid && kill(pid, 0) == -1)
139		return -1;
140	interval->tv_sec = 0;
141	interval->tv_nsec = sysconf(_SC_SCHED_RT_TS) * 1000;
142	return 0;
143}
144
145/*
146 * Process affinity.
147 */
148
149int
150sched_getaffinity_np(pid_t pid, size_t size, cpuset_t *cpuset)
151{
152
153	return _sched_getaffinity(pid, P_ALL_LWPS, size, cpuset);
154}
155
156int
157sched_setaffinity_np(pid_t pid, size_t size, cpuset_t *cpuset)
158{
159
160	return _sched_setaffinity(pid, P_ALL_LWPS, size, cpuset);
161}
162