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
48 int
sched_setparam(pid_t pid,const struct sched_param * param)49 sched_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
58 int
sched_getparam(pid_t pid,struct sched_param * param)59 sched_getparam(pid_t pid, struct sched_param *param)
60 {
61
62 return _sched_getparam(pid, P_ALL_LWPS, NULL, param);
63 }
64
65 int
sched_setscheduler(pid_t pid,int policy,const struct sched_param * param)66 sched_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
84 int
sched_getscheduler(pid_t pid)85 sched_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
101 int
sched_get_priority_max(int policy)102 sched_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
117 int
sched_get_priority_min(int policy)118 sched_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
133 int
134 /*ARGSUSED*/
sched_rr_get_interval(pid_t pid,struct timespec * interval)135 sched_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
149 int
sched_getaffinity_np(pid_t pid,size_t size,cpuset_t * cpuset)150 sched_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
156 int
sched_setaffinity_np(pid_t pid,size_t size,cpuset_t * cpuset)157 sched_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