lib/libthread_xu/thread/thr_setschedparam.c

   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 1.7 2007/05/04 17:18:55 dillon 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 (pthread == curthread) {
  53                 THR_LOCK(curthread);
  54                 if (curthread->attr.sched_policy == policy &&
  55                      curthread->attr.prio == param->sched_priority) {
  56                         THR_UNLOCK(curthread);
  57                         return (0);
  58                 }
  59                 if (policy == SCHED_OTHER) {
  60                         ret = _thr_set_sched_other_prio(curthread,
  61                                                 param->sched_priority);
  62                 } else {
  63                         ret = _thr_setscheduler(curthread->tid, policy, param);
  64                 }
  65                 if (ret == -1)
  66                         ret = errno;
  67                 else {
  68                         curthread->attr.sched_policy = policy;
  69                         curthread->attr.prio = param->sched_priority;
  70                 }
  71                 THR_UNLOCK(curthread);
  72         } else if ((ret = _thr_ref_add(curthread, pthread, /*include dead*/0))
  73                 == 0) {
  74                 THR_THREAD_LOCK(curthread, pthread);
  75                 if (pthread->attr.sched_policy == policy &&
  76                      pthread->attr.prio == param->sched_priority) {
  77                         THR_THREAD_UNLOCK(curthread, pthread);
  78                         return (0);
  79                 }
  80                 if (policy == SCHED_OTHER) {
  81                         ret = _thr_set_sched_other_prio(pthread,
  82                                                 param->sched_priority);
  83                 } else {
  84                         ret = _thr_setscheduler(pthread->tid, policy, param);
  85                 }
  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
  98 __strong_reference(_pthread_setschedparam, pthread_setschedparam);