/*
 * pthread_barrier_init.c
 *
 * Description:
 * This translation unit implements barrier primitives.
 *
 * --------------------------------------------------------------------------
 *
 *      Pthreads4w - POSIX Threads Library for Win32
 *      Copyright(C) 1998 John E. Bossom
 *      Copyright(C) 1999-2018, Pthreads4w contributors
 *
 *      Homepage: https://sourceforge.net/projects/pthreads4w/
 *
 *      The current list of contributors is contained
 *      in the file CONTRIBUTORS included with the source
 *      code distribution. The list can also be seen at the
 *      following World Wide Web location:
 *      https://sourceforge.net/p/pthreads4w/wiki/Contributors/
 *
 * This file is part of Pthreads4w.
 *
 *    Pthreads4w is free software: you can redistribute it and/or modify
 *    it under the terms of the GNU General Public License as published by
 *    the Free Software Foundation, either version 3 of the License, or
 *    (at your option) any later version.
 *
 *    Pthreads4w 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 General Public License for more details.
 *
 *    You should have received a copy of the GNU General Public License
 *    along with Pthreads4w.  If not, see <http://www.gnu.org/licenses/>. *
 */

#ifdef HAVE_CONFIG_H
# include <config.h>
#endif

#include "pthread.h"
#include "implement.h"


int
pthread_barrier_init (pthread_barrier_t * barrier,
		      const pthread_barrierattr_t * attr, unsigned int count)
{
  pthread_barrier_t b;

  if (barrier == NULL || count == 0)
    {
      return EINVAL;
    }

  if (NULL != (b = (pthread_barrier_t) calloc (1, sizeof (*b))))
    {
      b->pshared = (attr != NULL && *attr != NULL
		    ? (*attr)->pshared : PTHREAD_PROCESS_PRIVATE);

      b->nCurrentBarrierHeight = b->nInitialBarrierHeight = count;
      b->lock = 0;

      if (0 == sem_init (&(b->semBarrierBreeched), b->pshared, 0))
	    {
	      *barrier = b;
	      return 0;
	    }
      (void) free (b);
    }

  return ENOMEM;
}