barrier4.c

POSIX Multithraed library for windows

/*
 * barrier4.c
 *
 *
 * --------------------------------------------------------------------------
 *
 *      Pthreads-win32 - POSIX Threads Library for Win32
 *      Copyright(C) 1998 John E. Bossom
 *      Copyright(C) 1999,2005 Pthreads-win32 contributors
 * 
 *      Contact Email: [e-mail]
 * 
 *      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:
 *      http://sources.redhat.com/pthreads-win32/contributors.html
 * 
 *      This 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 of the License, or (at your option) any later version.
 * 
 *      This 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 this library in the file COPYING.LIB;
 *      if not, write to the Free Software Foundation, Inc.,
 *      59 Temple Place - Suite 330, Boston, MA 02111-1307, USA
 *
 * --------------------------------------------------------------------------
 *
 * Declare a single barrier object, multiple wait on it, 
 * and then destroy it.
 *
 */

#include "test.h"

enum {
  NUMTHREADS = 16
};
 
pthread_barrier_t barrier = NULL;
pthread_mutex_t mx = PTHREAD_MUTEX_INITIALIZER;
static int serialThreadCount = 0;
static int otherThreadCount = 0;

void *
func(void * arg)
{
  int result = pthread_barrier_wait(&barrier);

  assert(pthread_mutex_lock(&mx) == 0);

  if (result == PTHREAD_BARRIER_SERIAL_THREAD)
    {
      serialThreadCount++;
    }
  else if (0 == result)
    {
      otherThreadCount++;
    }
  else
    {
      printf("Barrier wait failed: error = %s\n", error_string[result]);
      fflush(stdout);
      return NULL;
    }
  assert(pthread_mutex_unlock(&mx) == 0);

  return NULL;
}

int
main()
{
  int i, j;
  pthread_t t[NUMTHREADS + 1];

  for (j = 1; j <= NUMTHREADS; j++)
    {
      printf("Barrier height = %d\n", j);

      serialThreadCount = 0;

      assert(pthread_barrier_init(&barrier, NULL, j) == 0);

      for (i = 1; i <= j; i++)
        {
          assert(pthread_create(&t[i], NULL, func, NULL) == 0);
        }

      for (i = 1; i <= j; i++)
        {
          assert(pthread_join(t[i], NULL) == 0);
        }

      assert(serialThreadCount == 1);

      assert(pthread_barrier_destroy(&barrier) == 0);
    }

  assert(pthread_mutex_destroy(&mx) == 0);

  return 0;
}