/* 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 <errno.h>

#include "pthreadP.h"

#include <futex-internal.h>

#include <kernel-features.h>

static const struct pthread_barrierattr default_barrierattr =

  {

    .pshared = PTHREAD_PROCESS_PRIVATE

  };

int

__pthread_barrier_init (pthread_barrier_t *barrier,

			const pthread_barrierattr_t *attr, unsigned int count)

{

  ASSERT_TYPE_SIZE (pthread_barrier_t, __SIZEOF_PTHREAD_BARRIER_T);

  ASSERT_PTHREAD_INTERNAL_SIZE (pthread_barrier_t,

				struct pthread_barrier);

  struct pthread_barrier *ibarrier;

  /* XXX EINVAL is not specified by POSIX as a possible error code for COUNT

     being too large.  See pthread_barrier_wait for the reason for the

     comparison with BARRIER_IN_THRESHOLD.  */

  if (__glibc_unlikely (count == 0 || count >= BARRIER_IN_THRESHOLD))

    return EINVAL;

  const struct pthread_barrierattr *iattr

    = (attr != NULL

       ? (struct pthread_barrierattr *) attr

       : &default_barrierattr);

  ibarrier = (struct pthread_barrier *) barrier;

  /* Initialize the individual fields.  */

  ibarrier->in = 0;

  ibarrier->out = 0;

  ibarrier->count = count;

  ibarrier->current_round = 0;

  ibarrier->shared = (iattr->pshared == PTHREAD_PROCESS_PRIVATE

		      ? FUTEX_PRIVATE : FUTEX_SHARED);

  return 0;

}

weak_alias (__pthread_barrier_init, pthread_barrier_init)