1 /* $NetBSD: sched.c,v 1.2 2008/10/31 00:29:19 rmind 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 1.2 2008/10/31 00:29:19 rmind Exp $"); 31 32 #include <string.h> 33 #include <unistd.h> 34 #include <errno.h> 35 #include <sched.h> 36 #include <sys/param.h> 37 #include <sys/types.h> 38 39 /* All LWPs in the process */ 40 #define P_ALL_LWPS 0 41 42 /* 43 * Scheduling parameters. 44 */ 45 46 int 47 sched_setparam(pid_t pid, const struct sched_param *param) 48 { 49 struct sched_param sp; 50 51 memset(&sp, 0, sizeof(struct sched_param)); 52 sp.sched_priority = param->sched_priority; 53 return _sched_setparam(pid, P_ALL_LWPS, SCHED_NONE, &sp); 54 } 55 56 int 57 sched_getparam(pid_t pid, struct sched_param *param) 58 { 59 60 return _sched_getparam(pid, P_ALL_LWPS, NULL, param); 61 } 62 63 int 64 sched_setscheduler(pid_t pid, int policy, const struct sched_param *param) 65 { 66 struct sched_param sp; 67 int ret, old_policy; 68 69 ret = _sched_getparam(pid, P_ALL_LWPS, &old_policy, &sp); 70 if (ret < 0) 71 return ret; 72 73 memset(&sp, 0, sizeof(struct sched_param)); 74 sp.sched_priority = param->sched_priority; 75 ret = _sched_setparam(pid, P_ALL_LWPS, policy, &sp); 76 if (ret < 0) 77 return ret; 78 79 return old_policy; 80 } 81 82 int 83 sched_getscheduler(pid_t pid) 84 { 85 struct sched_param sp; 86 int ret, policy; 87 88 ret = _sched_getparam(pid, P_ALL_LWPS, &policy, &sp); 89 if (ret < 0) 90 return ret; 91 92 return policy; 93 } 94 95 /* 96 * Scheduling priorities. 97 */ 98 99 int 100 sched_get_priority_max(int policy) 101 { 102 103 if (policy < SCHED_OTHER || policy > SCHED_RR) { 104 errno = EINVAL; 105 return -1; 106 } 107 return sysconf(_SC_SCHED_PRI_MAX); 108 } 109 110 int 111 sched_get_priority_min(int policy) 112 { 113 114 if (policy < SCHED_OTHER || policy > SCHED_RR) { 115 errno = EINVAL; 116 return -1; 117 } 118 return sysconf(_SC_SCHED_PRI_MIN); 119 } 120 121 int 122 /*ARGSUSED*/ 123 sched_rr_get_interval(pid_t pid, struct timespec *interval) 124 { 125 126 interval->tv_sec = 0; 127 interval->tv_nsec = sysconf(_SC_SCHED_RT_TS) * 1000; 128 return 0; 129 } 130 131 /* 132 * Process affinity. 133 */ 134 135 int 136 sched_getaffinity_np(pid_t pid, size_t size, cpuset_t *cpuset) 137 { 138 139 return _sched_getaffinity(pid, P_ALL_LWPS, size, cpuset); 140 } 141 142 int 143 sched_setaffinity_np(pid_t pid, size_t size, cpuset_t *cpuset) 144 { 145 146 return _sched_setaffinity(pid, P_ALL_LWPS, size, cpuset); 147 } 148