thr_setschedparam.c revision 162036
1/* 2 * Copyright (c) 1998 Daniel Eischen <eischen@vigrid.com>. 3 * All rights reserved. 4 * 5 * Redistribution and use in source and binary forms, with or without 6 * modification, are permitted provided that the following conditions 7 * are met: 8 * 1. Redistributions of source code must retain the above copyright 9 * notice, this list of conditions and the following disclaimer. 10 * 2. Redistributions in binary form must reproduce the above copyright 11 * notice, this list of conditions and the following disclaimer in the 12 * documentation and/or other materials provided with the distribution. 13 * 3. All advertising materials mentioning features or use of this software 14 * must display the following acknowledgement: 15 * This product includes software developed by Daniel Eischen. 16 * 4. Neither the name of the author nor the names of any co-contributors 17 * may be used to endorse or promote products derived from this software 18 * without specific prior written permission. 19 * 20 * THIS SOFTWARE IS PROVIDED BY DANIEL EISCHEN AND CONTRIBUTORS ``AS IS'' AND 21 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 22 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 23 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE 24 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 25 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 26 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 27 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 28 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 29 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 30 * SUCH DAMAGE. 31 * 32 * $FreeBSD: head/lib/libthr/thread/thr_setschedparam.c 162036 2006-09-05 14:37:22Z davidxu $ 33 */ 34 35#include "namespace.h" 36#include <sys/param.h> 37#include <errno.h> 38#include <pthread.h> 39#include "un-namespace.h" 40 41#include "thr_private.h" 42 43__weak_reference(_pthread_setschedparam, pthread_setschedparam); 44 45/* 46 * Set a thread's scheduling parameters, this should be done 47 * in kernel, doing it in userland is no-op. 48 */ 49int 50_pthread_setschedparam(pthread_t pthread, int policy, 51 const struct sched_param *param) 52{ 53 struct pthread *curthread = _get_curthread(); 54 int ret; 55 56 if (pthread == curthread) { 57 THR_LOCK(curthread); 58 if (curthread->attr.sched_policy == policy && 59 (policy == SCHED_OTHER || 60 curthread->attr.prio == param->sched_priority)) { 61 pthread->attr.prio = param->sched_priority; 62 THR_UNLOCK(curthread); 63 return (0); 64 } 65 ret = thr_setscheduler(curthread->tid, policy, param, 66 sizeof(struct sched_param)); 67 if (ret == -1) 68 ret = errno; 69 else { 70 curthread->attr.sched_policy = policy; 71 curthread->attr.prio = param->sched_priority; 72 } 73 THR_UNLOCK(curthread); 74 } else if ((ret = _thr_ref_add(curthread, pthread, /*include dead*/0)) 75 == 0) { 76 THR_THREAD_LOCK(curthread, pthread); 77 if (pthread->attr.sched_policy == policy && 78 (policy == SCHED_OTHER || 79 pthread->attr.prio == param->sched_priority)) { 80 pthread->attr.prio = param->sched_priority; 81 THR_THREAD_UNLOCK(curthread, pthread); 82 return (0); 83 } 84 ret = thr_setscheduler(pthread->tid, policy, param, 85 sizeof(struct sched_param)); 86 if (ret == -1) 87 ret = errno; 88 else { 89 pthread->attr.sched_policy = policy; 90 pthread->attr.prio = param->sched_priority; 91 } 92 THR_THREAD_UNLOCK(curthread, pthread); 93 _thr_ref_delete(curthread, pthread); 94 } 95 return (ret); 96} 97