/* C11 threads mutex initialization implementation.

   Copyright (C) 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 <stdalign.h>

#include "thrd_priv.h"

int

mtx_init (mtx_t *mutex, int type)

{

  _Static_assert (sizeof (mtx_t) == sizeof (pthread_mutex_t),

		  "sizeof (mtx_t) != sizeof (pthread_mutex_t)");

  _Static_assert (alignof (mtx_t) == alignof (pthread_mutex_t),

		  "alignof (mtx_t) != alignof (pthread_mutex_t)");

  pthread_mutexattr_t attr;

  __pthread_mutexattr_init (&attr);

  /* Another possible solution would be to set the flags directly in

     mutex object. */

  switch (type)

  {

    case mtx_plain | mtx_recursive:

    case mtx_timed | mtx_recursive:

      __pthread_mutexattr_settype (&attr, PTHREAD_MUTEX_RECURSIVE);

      break;

    case mtx_plain:

    case mtx_timed: /* No difference between both in standard */

    default:

      __pthread_mutexattr_settype (&attr, PTHREAD_MUTEX_NORMAL);

      break;

  }

  int err_code = __pthread_mutex_init ((pthread_mutex_t *) mutex, &attr);

  /* pthread_mutexattr_destroy implementation is a noop.  */

  return thrd_err_map (err_code);

}