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/* pthread_mutex_consistent. Hurd version.
Copyright (C) 2016-2018 Free Software Foundation, Inc.
This file is part of the GNU C Library.
This program is free software; you can redistribute it and/or
modify it under the terms of the GNU Library General Public License
as published by the Free Software Foundation; either
version 2 of the license, or (at your option) any later version.
This program 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 Library General Public License for more details.
You should have received a copy of the GNU Library General Public
License along with this program; 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)
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