1 /* $NetBSD: sched.c,v 1.4 2012/03/18 02:04:39 christos 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 1.4 2012/03/18 02:04:39 christos Exp $");
31
32 #include <string.h>
33 #include <unistd.h>
34 #include <errno.h>
35 #include <sched.h>
36 #include <signal.h>
37 #include <sys/param.h>
38 #include <sys/types.h>
39
40 /* All LWPs in the process */
41 #define P_ALL_LWPS 0
42
43 /*
44 * Scheduling parameters.
45 */
46
47 int
sched_setparam(pid_t pid,const struct sched_param * param)48 sched_setparam(pid_t pid, const struct sched_param *param)
49 {
50 struct sched_param sp;
51
52 memset(&sp, 0, sizeof(struct sched_param));
53 sp.sched_priority = param->sched_priority;
54 return _sched_setparam(pid, P_ALL_LWPS, SCHED_NONE, &sp);
55 }
56
57 int
sched_getparam(pid_t pid,struct sched_param * param)58 sched_getparam(pid_t pid, struct sched_param *param)
59 {
60
61 return _sched_getparam(pid, P_ALL_LWPS, NULL, param);
62 }
63
64 int
sched_setscheduler(pid_t pid,int policy,const struct sched_param * param)65 sched_setscheduler(pid_t pid, int policy, const struct sched_param *param)
66 {
67 struct sched_param sp;
68 int ret, old_policy;
69
70 ret = _sched_getparam(pid, P_ALL_LWPS, &old_policy, &sp);
71 if (ret < 0)
72 return ret;
73
74 memset(&sp, 0, sizeof(struct sched_param));
75 sp.sched_priority = param->sched_priority;
76 ret = _sched_setparam(pid, P_ALL_LWPS, policy, &sp);
77 if (ret < 0)
78 return ret;
79
80 return old_policy;
81 }
82
83 int
sched_getscheduler(pid_t pid)84 sched_getscheduler(pid_t pid)
85 {
86 struct sched_param sp;
87 int ret, policy;
88
89 ret = _sched_getparam(pid, P_ALL_LWPS, &policy, &sp);
90 if (ret < 0)
91 return ret;
92
93 return policy;
94 }
95
96 /*
97 * Scheduling priorities.
98 */
99
100 int
sched_get_priority_max(int policy)101 sched_get_priority_max(int policy)
102 {
103
104 if (policy < SCHED_OTHER || policy > SCHED_RR) {
105 errno = EINVAL;
106 return -1;
107 }
108 return (int)sysconf(_SC_SCHED_PRI_MAX);
109 }
110
111 int
sched_get_priority_min(int policy)112 sched_get_priority_min(int policy)
113 {
114
115 if (policy < SCHED_OTHER || policy > SCHED_RR) {
116 errno = EINVAL;
117 return -1;
118 }
119 return (int)sysconf(_SC_SCHED_PRI_MIN);
120 }
121
122 int
123 /*ARGSUSED*/
sched_rr_get_interval(pid_t pid,struct timespec * interval)124 sched_rr_get_interval(pid_t pid, struct timespec *interval)
125 {
126
127 if (pid && kill(pid, 0) == -1)
128 return -1;
129 interval->tv_sec = 0;
130 interval->tv_nsec = sysconf(_SC_SCHED_RT_TS) * 1000;
131 return 0;
132 }
133
134 /*
135 * Process affinity.
136 */
137
138 int
sched_getaffinity_np(pid_t pid,size_t size,cpuset_t * cpuset)139 sched_getaffinity_np(pid_t pid, size_t size, cpuset_t *cpuset)
140 {
141
142 return _sched_getaffinity(pid, P_ALL_LWPS, size, cpuset);
143 }
144
145 int
sched_setaffinity_np(pid_t pid,size_t size,cpuset_t * cpuset)146 sched_setaffinity_np(pid_t pid, size_t size, cpuset_t *cpuset)
147 {
148
149 return _sched_setaffinity(pid, P_ALL_LWPS, size, cpuset);
150 }
151