/* pthread_mutex_consistent.  Hurd version.

   Copyright (C) 2016-2018 Free Software Foundation, Inc.

   This file is part of the GNU C Library.

   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 <pthread.h>

#include <stdlib.h>

#include <assert.h>

#include <pt-internal.h>

#include "pt-mutex.h"

#include <hurdlock.h>

int

pthread_mutex_consistent (pthread_mutex_t *mtxp)

{

  int ret = EINVAL;

  unsigned int val = mtxp->__lock;

  if ((mtxp->__flags & PTHREAD_MUTEX_ROBUST) != 0 &&

      (val & LLL_DEAD_OWNER) != 0 &&

      atomic_compare_and_exchange_bool_acq (&mtxp->__lock,

					    __getpid () | LLL_WAITERS,

					    val) == 0)

    {

      /* The mutex is now ours, and it's consistent. */

      mtxp->__owner_id = _pthread_self ()->thread;

      mtxp->__cnt = 1;

      ret = 0;

    }

  return ret;

}

weak_alias (pthread_mutex_consistent, pthread_mutex_consistent_np)