nptl/pthread_getschedparam.c

   1 /* Copyright (C) 2002 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, write to the Free
  17    Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
  18    02111-1307 USA.  */
  19
  20 #include <string.h>
  21 #include "pthreadP.h"
  22 #include <lowlevellock.h>
  23
  24
  25 int
  26 pthread_getschedparam (thread_id, policy, param)
  27      pthread_t thread_id;
  28      int *policy;
  29      struct sched_param *param;
  30 {
  31   struct pthread *thread = (struct pthread *) thread_id;
  32
  33   /* We have to handle cancellation in the following code since we are
  34      locking another threads desriptor.  */
  35   pthread_cleanup_push ((void (*) (void *)) lll_unlock_wake_cb, &thread->lock);
  36
  37   lll_lock (thread->lock);
  38
  39   /* The library is responsible for maintaining the values at all
  40      times.  If the user uses a interface other than
  41      pthread_setschedparam to modify the scheduler setting it is not
  42      the library's problem.  */
  43   *policy = thread->schedpolicy;
  44   memcpy (param, &thread->schedparam, sizeof (struct sched_param));
  45
  46   lll_unlock (thread->lock);
  47
  48   pthread_cleanup_pop (0);
  49
  50   return 0;
  51 }