libpthread/nptl/pthread_attr_setschedparam.c

   1 /* Copyright (C) 2002, 2004, 2009 Free Software Foundation, Inc.
   2    This file is part of the GNU C Library.
   3    Contributed by Ulrich Drepper <drepper@redhat.com>, 2002.
   4
   5    The GNU C Library is free software; you can redistribute it and/or
   6    modify it under the terms of the GNU Lesser General Public
   7    License as published by the Free Software Foundation; either
   8    version 2.1 of the License, or (at your option) any later version.
   9
  10    The GNU C Library is distributed in the hope that it will be useful,
  11    but WITHOUT ANY WARRANTY; without even the implied warranty of
  12    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  13    Lesser General Public License for more details.
  14
  15    You should have received a copy of the GNU Lesser General Public
  16    License along with the GNU C Library; if not, see
  17    <http://www.gnu.org/licenses/>.  */
  18
  19 #include <assert.h>
  20 #include <errno.h>
  21 #include <string.h>
  22 #include "pthreadP.h"
  23
  24
  25 int
  26 attribute_protected
  27 __pthread_attr_setschedparam (
  28      pthread_attr_t *attr,
  29      const struct sched_param *param)
  30 {
  31   assert (sizeof (*attr) >= sizeof (struct pthread_attr));
  32   struct pthread_attr *iattr = (struct pthread_attr *) attr;
  33
  34   int min = sched_get_priority_min (iattr->schedpolicy);
  35   int max = sched_get_priority_max (iattr->schedpolicy);
  36   if (min == -1 || max == -1
  37       || param->sched_priority > max || param->sched_priority < min)
  38     return EINVAL;
  39
  40   /* Copy the new values.  */
  41   memcpy (&iattr->schedparam, param, sizeof (struct sched_param));
  42
  43   /* Remember we set the value.  */
  44   iattr->flags |= ATTR_FLAG_SCHED_SET;
  45
  46   return 0;
  47 }
  48 strong_alias (__pthread_attr_setschedparam, pthread_attr_setschedparam)