lib/libthr/thread/thr_setprio.c

   1 /*
   2  * Copyright (c) 1995 John Birrell <jb@cimlogic.com.au>.
   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. Neither the name of the author nor the names of any co-contributors
  14  *    may be used to endorse or promote products derived from this software
  15  *    without specific prior written permission.
  16  *
  17  * THIS SOFTWARE IS PROVIDED BY JOHN BIRRELL AND CONTRIBUTORS ``AS IS'' AND
  18  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  19  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  20  * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
  21  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  22  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  23  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  24  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  25  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  26  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  27  * SUCH DAMAGE.
  28  *
  29  * $FreeBSD$
  30  */
  31
  32 #include "namespace.h"
  33 #include <pthread.h>
  34 #include "un-namespace.h"
  35
  36 #include "thr_private.h"
  37
  38 __weak_reference(_pthread_setprio, pthread_setprio);
  39
  40 int
  41 _pthread_setprio(pthread_t pthread, int prio)
  42 {
  43         struct pthread  *curthread = _get_curthread();
  44         struct sched_param      param;
  45         int     ret;
  46
  47         param.sched_priority = prio;
  48         if (pthread == curthread) {
  49                 THR_LOCK(curthread);
  50                 if (curthread->attr.sched_policy == SCHED_OTHER ||
  51                     curthread->attr.prio == prio) {
  52                         curthread->attr.prio = prio;
  53                         ret = 0;
  54                 } else {
  55                         ret = _thr_setscheduler(curthread->tid,
  56                             curthread->attr.sched_policy, &param);
  57                         if (ret == -1)
  58                                 ret = errno;
  59                         else
  60                                 curthread->attr.prio = prio;
  61                 }
  62                 THR_UNLOCK(curthread);
  63         } else if ((ret = _thr_ref_add(curthread, pthread, /*include dead*/0))
  64                 == 0) {
  65                 THR_THREAD_LOCK(curthread, pthread);
  66                 if (pthread->attr.sched_policy == SCHED_OTHER ||
  67                     pthread->attr.prio == prio) {
  68                         pthread->attr.prio = prio;
  69                         ret = 0;
  70                 } else {
  71                         ret = _thr_setscheduler(pthread->tid,
  72                                 curthread->attr.sched_policy, &param);
  73                         if (ret == -1)
  74                                 ret = errno;
  75                         else
  76                                 pthread->attr.prio = prio;
  77                 }
  78                 THR_THREAD_UNLOCK(curthread, pthread);
  79                 _thr_ref_delete(curthread, pthread);
  80         }
  81         return (ret);
  82 }