nptl/pthread_mutexattr_setrobust.c


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/* Copyright (C) 2005 Free Software Foundation, Inc.
   This file is part of the GNU C Library.
   Contributed by Ulrich Drepper <drepper@redhat.com>, 2005.

   The GNU C Library is free software; you can redistribute it and/or
   modify it under the terms of the GNU Lesser General Public
   License as published by the Free Software Foundation; either
   version 2.1 of the License, or (at your option) any later version.

   The GNU C Library is distributed in the hope that it will be useful,
   but WITHOUT ANY WARRANTY; without even the implied warranty of
   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
   Lesser General Public License for more details.

   You should have received a copy of the GNU Lesser General Public
   License along with the GNU C Library; if not, write to the Free
   Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
   02111-1307 USA.  */

#include <errno.h>
#include <pthreadP.h>


int
pthread_mutexattr_setrobust_np (attr, robustness)
     pthread_mutexattr_t *attr;
     int robustness;
{
  if (robustness != PTHREAD_MUTEX_STALLED_NP
      && __builtin_expect (robustness != PTHREAD_MUTEX_ROBUST_NP, 0))
    return EINVAL;

  struct pthread_mutexattr *iattr = (struct pthread_mutexattr *) attr;

  /* We use bit 30 to signal whether the mutex is going to be
     robust or not.  */
  if (robustness == PTHREAD_MUTEX_STALLED_NP)
    iattr->mutexkind &= ~PTHREAD_MUTEXATTR_FLAG_ROBUST;
  else
    iattr->mutexkind |= PTHREAD_MUTEXATTR_FLAG_ROBUST;

  return 0;
}