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 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 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 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 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 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 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*/ 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 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 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