Blame nptl/tst-barrier5.c

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/* This tests the barrier reset mechanism.
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   Copyright (C) 2004-2018 Free Software Foundation, Inc.
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   This file is part of the GNU C Library.
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   The GNU C Library is free software; you can redistribute it and/or
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   modify it under the terms of the GNU Lesser General Public
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   License as published by the Free Software Foundation; either
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   version 2.1 of the License, or (at your option) any later version.
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   The GNU C Library is distributed in the hope that it will be useful,
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   but WITHOUT ANY WARRANTY; without even the implied warranty of
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   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
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   Lesser General Public License for more details.
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   You should have received a copy of the GNU Lesser General Public
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   License along with the GNU C Library; if not, see
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   <http://www.gnu.org/licenses/>.  */
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#include <errno.h>
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#include <pthread.h>
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#include <stdio.h>
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#include <stdlib.h>
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#include <internaltypes.h>
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static pthread_barrier_t b1;
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static pthread_barrier_t b2;
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#define N 20
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#define ROUNDS_PER_RUN 20
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#define START ((BARRIER_IN_THRESHOLD / N - ROUNDS_PER_RUN / 2) * N)
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static void *
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tf (void *arg)
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{
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  int runs = 0;
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  while (runs++ < 30)
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    {
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      /* In each run, we execute a number of rounds and initialize the barrier
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	 so that we will go over the reset threshold with those rounds.  */
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      for (int rounds = 0; rounds < ROUNDS_PER_RUN; rounds++)
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	pthread_barrier_wait (&b1;;
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      if (pthread_barrier_wait (&b1) == PTHREAD_BARRIER_SERIAL_THREAD)
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	{
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	  pthread_barrier_destroy (&b1;;
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	  if (pthread_barrier_init (&b1, NULL, N) != 0)
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	    {
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	      puts ("tf: 1st barrier_init failed");
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	      exit (1);
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	    }
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	  puts ("b1 reinitialized");
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	  /* Trigger a reset.  */
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	  struct pthread_barrier *bar = (struct pthread_barrier *) &b1;
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	  bar->in = START;
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	  bar->out = START;
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	  /* We deliberately don't set bar->current_round so that we also
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	     test whether the helping for the updates of current_round
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	     works correctly.  */
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	}
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      /* Same as above, just for b2.  */
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      for (int rounds = 0; rounds < ROUNDS_PER_RUN; rounds++)
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	pthread_barrier_wait (&b2;;
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      if (pthread_barrier_wait (&b2) == PTHREAD_BARRIER_SERIAL_THREAD)
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	{
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	  pthread_barrier_destroy (&b2;;
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	  if (pthread_barrier_init (&b2, NULL, N) != 0)
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	    {
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	      puts ("tf: 2nd barrier_init failed");
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	      exit (1);
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	    }
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	  puts ("b2 reinitialized");
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	  /* Trigger a reset.  See above.  */
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	  struct pthread_barrier *bar = (struct pthread_barrier *) &b2;
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	  bar->in = START;
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	  bar->out = START;
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	}
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    }
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  return NULL;
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}
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static int
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do_test (void)
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{
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  pthread_attr_t at;
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  int cnt;
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  if (pthread_attr_init (&at) != 0)
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    {
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      puts ("attr_init failed");
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      return 1;
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    }
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  if (pthread_attr_setstacksize (&at, 1 * 1024 * 1024) != 0)
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    {
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      puts ("attr_setstacksize failed");
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      return 1;
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    }
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  if (pthread_barrier_init (&b1, NULL, N) != 0)
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    {
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      puts ("1st barrier_init failed");
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      return 1;
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    }
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  if (pthread_barrier_init (&b2, NULL, N) != 0)
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    {
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      puts ("2nd barrier_init failed");
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      return 1;
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    }
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  pthread_t th[N - 1];
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  for (cnt = 0; cnt < N - 1; ++cnt)
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    if (pthread_create (&th[cnt], &at, tf, NULL) != 0)
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      {
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	puts ("pthread_create failed");
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	return 1;
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      }
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  if (pthread_attr_destroy (&at) != 0)
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    {
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      puts ("attr_destroy failed");
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      return 1;
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    }
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  tf (NULL);
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  for (cnt = 0; cnt < N - 1; ++cnt)
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    if (pthread_join (th[cnt], NULL) != 0)
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      {
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	puts ("pthread_join failed");
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	return 1;
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      }
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  return 0;
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}
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#define TEST_FUNCTION do_test ()
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#include "../test-skeleton.c"