/* This tests the barrier reset mechanism.

   Copyright (C) 2004-2018 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 <errno.h>

#include <pthread.h>

#include <stdio.h>

#include <stdlib.h>

#include <internaltypes.h>

static pthread_barrier_t b1;

static pthread_barrier_t b2;

#define N 20

#define ROUNDS_PER_RUN 20

#define START ((BARRIER_IN_THRESHOLD / N - ROUNDS_PER_RUN / 2) * N)

static void *

tf (void *arg)

{

  int runs = 0;

  while (runs++ < 30)

    {

      /* In each run, we execute a number of rounds and initialize the barrier

	 so that we will go over the reset threshold with those rounds.  */

      for (int rounds = 0; rounds < ROUNDS_PER_RUN; rounds++)

	pthread_barrier_wait (&b1;;

      if (pthread_barrier_wait (&b1) == PTHREAD_BARRIER_SERIAL_THREAD)

	{

	  pthread_barrier_destroy (&b1;;

	  if (pthread_barrier_init (&b1, NULL, N) != 0)

	    {

	      puts ("tf: 1st barrier_init failed");

	      exit (1);

	    }

	  puts ("b1 reinitialized");

	  /* Trigger a reset.  */

	  struct pthread_barrier *bar = (struct pthread_barrier *) &b1;

	  bar->in = START;

	  bar->out = START;

	  /* We deliberately don't set bar->current_round so that we also

	     test whether the helping for the updates of current_round

	     works correctly.  */

	}

      /* Same as above, just for b2.  */

      for (int rounds = 0; rounds < ROUNDS_PER_RUN; rounds++)

	pthread_barrier_wait (&b2;;

      if (pthread_barrier_wait (&b2) == PTHREAD_BARRIER_SERIAL_THREAD)

	{

	  pthread_barrier_destroy (&b2;;

	  if (pthread_barrier_init (&b2, NULL, N) != 0)

	    {

	      puts ("tf: 2nd barrier_init failed");

	      exit (1);

	    }

	  puts ("b2 reinitialized");

	  /* Trigger a reset.  See above.  */

	  struct pthread_barrier *bar = (struct pthread_barrier *) &b2;

	  bar->in = START;

	  bar->out = START;

	}

    }

  return NULL;

}

static int

do_test (void)

{

  pthread_attr_t at;

  int cnt;

  if (pthread_attr_init (&at) != 0)

    {

      puts ("attr_init failed");

      return 1;

    }

  if (pthread_attr_setstacksize (&at, 1 * 1024 * 1024) != 0)

    {

      puts ("attr_setstacksize failed");

      return 1;

    }

  if (pthread_barrier_init (&b1, NULL, N) != 0)

    {

      puts ("1st barrier_init failed");

      return 1;

    }

  if (pthread_barrier_init (&b2, NULL, N) != 0)

    {

      puts ("2nd barrier_init failed");

      return 1;

    }

  pthread_t th[N - 1];

  for (cnt = 0; cnt < N - 1; ++cnt)

    if (pthread_create (&th[cnt], &at, tf, NULL) != 0)

      {

	puts ("pthread_create failed");

	return 1;

      }

  if (pthread_attr_destroy (&at) != 0)

    {

      puts ("attr_destroy failed");

      return 1;

    }

  tf (NULL);

  for (cnt = 0; cnt < N - 1; ++cnt)

    if (pthread_join (th[cnt], NULL) != 0)

      {

	puts ("pthread_join failed");

	return 1;

      }

  return 0;

}

#define TEST_FUNCTION do_test ()

#include "../test-skeleton.c"