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 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 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 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 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 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 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*/ 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 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 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