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/* This tests the barrier reset mechanism.
Copyright (C) 2004-2021 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
<https://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"
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