/* Copyright (C) 2005-2018 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

   <http://www.gnu.org/licenses/>.  */

#include <errno.h>

#include <pthreadP.h>

int

pthread_mutex_consistent (pthread_mutex_t *mutex)

{

  /* Test whether this is a robust mutex with a dead owner.

     See concurrency notes regarding __kind in struct __pthread_mutex_s

     in sysdeps/nptl/bits/thread-shared-types.h.  */

  if ((atomic_load_relaxed (&(mutex->__data.__kind))

       & PTHREAD_MUTEX_ROBUST_NORMAL_NP) == 0

      || mutex->__data.__owner != PTHREAD_MUTEX_INCONSISTENT)

    return EINVAL;

  mutex->__data.__owner = THREAD_GETMEM (THREAD_SELF, tid);

  return 0;

}

weak_alias (pthread_mutex_consistent, pthread_mutex_consistent_np)