/* Copyright (C) 2002-2018 Free Software Foundation, Inc.

   This file is part of the GNU C Library.

   Contributed by Ulrich Drepper <drepper@redhat.com>, 2002.

   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 "pthreadP.h"

#include <string.h>

static const struct pthread_rwlockattr default_rwlockattr =

  {

    .lockkind = PTHREAD_RWLOCK_DEFAULT_NP,

    .pshared = PTHREAD_PROCESS_PRIVATE

  };

/* See pthread_rwlock_common.c.  */

int

__pthread_rwlock_init (pthread_rwlock_t *rwlock,

		       const pthread_rwlockattr_t *attr)

{

  ASSERT_TYPE_SIZE (pthread_rwlock_t, __SIZEOF_PTHREAD_RWLOCK_T);

  const struct pthread_rwlockattr *iattr;

  iattr = ((const struct pthread_rwlockattr *) attr) ?: &default_rwlockattr;

  memset (rwlock, '\0', sizeof (*rwlock));

  rwlock->__data.__flags = iattr->lockkind;

  /* The value of __SHARED in a private rwlock must be zero.  */

  rwlock->__data.__shared = (iattr->pshared != PTHREAD_PROCESS_PRIVATE);

  return 0;

}

strong_alias (__pthread_rwlock_init, pthread_rwlock_init)