glibc/nptl/pthread_mutex_consistent.c

/* Copyright (C) 2005-2019 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_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)