/* 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)