/* Transfer ownership of a mutex.  Generic version.

   Copyright (C) 2008-2018 Free Software Foundation, Inc.

   Written by Neal H. Walfield <neal@gnu.org>.

   This file is part of the GNU Hurd.

   The GNU Hurd 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 3 of

   the License, or (at your option) any later version.

   The GNU Hurd 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 this program.  If not, see

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

#include <pthread.h>

#include <assert.h>

#include <pt-internal.h>

int

__pthread_mutex_transfer_np (struct __pthread_mutex *mutex, pthread_t tid)

{

  assert (mutex->__owner == _pthread_self ());

  struct __pthread *thread = __pthread_getid (tid);

  const struct __pthread_mutexattr *attr = mutex->__attr;

  if (thread == NULL)

    return ESRCH;

  if (thread == _pthread_self ())

    return 0;

  if (attr == __PTHREAD_ERRORCHECK_MUTEXATTR)

    attr = &__pthread_errorcheck_mutexattr;

  if (attr == __PTHREAD_RECURSIVE_MUTEXATTR)

    attr = &__pthread_recursive_mutexattr;

  if (attr != NULL && attr->__mutex_type == PTHREAD_MUTEX_ERRORCHECK)

    {

      if (mutex->__owner != _pthread_self ())

	return EPERM;

      mutex->__owner = thread;

    }

#ifndef NDEBUG

# if !defined(ALWAYS_TRACK_MUTEX_OWNER)

  if (attr != NULL && attr->__mutex_type != PTHREAD_MUTEX_NORMAL)

# endif

    {

      mutex->__owner = thread;

    }

#endif

  return 0;

}

strong_alias (__pthread_mutex_transfer_np, pthread_mutex_transfer_np)