lib/libthread_xu/thread/thr_getschedparam.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_getschedparam.c,v 1.5 2007/05/03 23:08:34 dillon Exp $
  33  */
  34
  35 #include "namespace.h"
  36 #include <machine/tls.h>
  37
  38 #include <errno.h>
  39 #include <pthread.h>
  40 #include "un-namespace.h"
  41
  42 #include "thr_private.h"
  43
  44 int
  45 _pthread_getschedparam(pthread_t pthread, int *policy,
  46         struct sched_param *param)
  47 {
  48         struct pthread *curthread = tls_get_curthread();
  49         int ret;
  50
  51         if (policy == NULL || param == NULL)
  52                 return (EINVAL);
  53
  54         if (pthread == curthread) {
  55                 /*
  56                  * Avoid searching the thread list when it is the current
  57                  * thread.
  58                  */
  59                 THR_LOCK(curthread);
  60                 *policy = curthread->attr.sched_policy;
  61                 param->sched_priority = curthread->attr.prio;
  62                 THR_UNLOCK(curthread);
  63                 ret = 0;
  64         }
  65         /* Find the thread in the list of active threads. */
  66         else if ((ret = _thr_ref_add(curthread, pthread, /*include dead*/0))
  67             == 0) {
  68                 THR_THREAD_LOCK(curthread, pthread);
  69                 *policy = pthread->attr.sched_policy;
  70                 param->sched_priority = pthread->attr.prio;
  71                 THR_THREAD_UNLOCK(curthread, pthread);
  72                 _thr_ref_delete(curthread, pthread);
  73         }
  74         return (ret);
  75 }
  76
  77 __strong_reference(_pthread_getschedparam, pthread_getschedparam);