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