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[thirdparty/glibc.git] / nptl / pthread_mutexattr_setrobust.c

/* Copyright (C) 2005-2021 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, see
   <https://www.gnu.org/licenses/>.  */

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


int
pthread_mutexattr_setrobust (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;
}
weak_alias (pthread_mutexattr_setrobust, pthread_mutexattr_setrobust_np)