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 * $DragonFly: src/lib/libthread_xu/thread/thr_setschedparam.c,v 1.5 2006/04/06 13:03:09 davidxu Exp $ 33 */ 34 35 #include "namespace.h" 36 #include <machine/tls.h> 37 38 #include <sys/param.h> 39 #include <errno.h> 40 #include <pthread.h> 41 #include "un-namespace.h" 42 43 #include "thr_private.h" 44 45 int 46 _pthread_setschedparam(pthread_t pthread, int policy, 47 const struct sched_param *param) 48 { 49 struct pthread *curthread = tls_get_curthread(); 50 int ret = 0; 51 52 if ((param == NULL) || (policy < SCHED_FIFO) || (policy > SCHED_RR)) { 53 /* Return an invalid argument error: */ 54 ret = EINVAL; 55 } else if ((param->sched_priority < THR_MIN_PRIORITY) || 56 (param->sched_priority > THR_MAX_PRIORITY)) { 57 /* Return an unsupported value error. */ 58 ret = ENOTSUP; 59 60 /* Find the thread in the list of active threads: */ 61 } else if ((ret = _thr_ref_add(curthread, pthread, /*include dead*/0)) 62 == 0) { 63 /* 64 * Lock the threads scheduling queue while we change 65 * its priority: 66 */ 67 THR_THREAD_LOCK(curthread, pthread); 68 if (pthread->state == PS_DEAD) { 69 THR_THREAD_UNLOCK(curthread, pthread); 70 _thr_ref_delete(curthread, pthread); 71 return (ESRCH); 72 } 73 74 /* Set the scheduling policy: */ 75 pthread->attr.sched_policy = policy; 76 77 if (param->sched_priority == 78 THR_BASE_PRIORITY(pthread->base_priority)) 79 /* 80 * There is nothing to do; unlock the threads 81 * scheduling queue. 82 */ 83 THR_THREAD_UNLOCK(curthread, pthread); 84 else { 85 /* Set the thread base priority: */ 86 pthread->base_priority = param->sched_priority; 87 88 /* Recalculate the active priority: */ 89 pthread->active_priority = MAX(pthread->base_priority, 90 pthread->inherited_priority); 91 92 /* Unlock the threads scheduling queue: */ 93 THR_THREAD_UNLOCK(curthread, pthread); 94 } 95 _thr_ref_delete(curthread, pthread); 96 } 97 return (ret); 98 } 99 100 __strong_reference(_pthread_setschedparam, pthread_setschedparam); 101