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/* Test sem_wait cancellation for contended case.
Copyright (C) 2003-2021 Free Software Foundation, Inc.
This file is part of the GNU C Library.
Contributed by Ulrich Drepper <drepper@redhat.com>, 2003.
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 <semaphore.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>
static pthread_barrier_t bar;
static sem_t sem;
static void
cleanup (void *arg)
{
static int ncall;
if (++ncall != 1)
{
puts ("second call to cleanup");
exit (1);
}
}
static void *
tf (void *arg)
{
pthread_cleanup_push (cleanup, NULL);
int e = pthread_barrier_wait (&bar);
if (e != 0 && e != PTHREAD_BARRIER_SERIAL_THREAD)
{
puts ("error: tf: 1st barrier_wait failed");
exit (1);
}
/* This call should block and be cancelable. */
sem_wait (&sem);
pthread_cleanup_pop (0);
return NULL;
}
static int
do_test (void)
{
pthread_t th;
if (pthread_barrier_init (&bar, NULL, 2) != 0)
{
puts ("error: barrier_init failed");
exit (1);
}
/* A value equal to 0 will check for contended pthread cancellation,
where the sem_wait operation will block. */
if (sem_init (&sem, 0, 0) != 0)
{
puts ("error: sem_init failed");
exit (1);
}
if (pthread_create (&th, NULL, tf, NULL) != 0)
{
puts ("error: create failed");
exit (1);
}
int e = pthread_barrier_wait (&bar);
if (e != 0 && e != PTHREAD_BARRIER_SERIAL_THREAD)
{
puts ("error: 1st barrier_wait failed");
exit (1);
}
/* Give the child a chance to go to sleep in sem_wait. */
sleep (1);
/* Check whether cancellation is honored when waiting in sem_wait. */
if (pthread_cancel (th) != 0)
{
puts ("error: 1st cancel failed");
exit (1);
}
void *r;
if (pthread_join (th, &r) != 0)
{
puts ("error: join failed");
exit (1);
}
if (r != PTHREAD_CANCELED)
{
puts ("thread not canceled");
exit (1);
}
return 0;
}
#define TEST_FUNCTION do_test ()
#include "../test-skeleton.c"
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