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/* Test that raise sends signal to current thread even if blocked.
Copyright (C) 2021-2024 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 <signal.h>
#include <support/check.h>
#include <support/xsignal.h>
#include <support/xthread.h>
#include <pthread.h>
#include <unistd.h>
/* Used to create a dummy thread ID distinct from all other thread
IDs. */
static void *
noop (void *ignored)
{
return NULL;
}
static volatile pthread_t signal_thread;
static void
signal_handler (int signo)
{
signal_thread = pthread_self ();
}
/* Used to ensure that waiting_thread has launched and can accept
signals. */
static pthread_barrier_t barrier;
static void *
waiting_thread (void *ignored)
{
xpthread_barrier_wait (&barrier);
pause ();
return NULL;
}
static int
do_test (void)
{
xsignal (SIGUSR1, signal_handler);
xpthread_barrier_init (&barrier, NULL, 2);
/* Distinct thread ID value to */
pthread_t dummy = xpthread_create (NULL, noop, NULL);
signal_thread = dummy;
pthread_t helper = xpthread_create (NULL, waiting_thread, NULL);
/* Make sure that the thread is running. */
xpthread_barrier_wait (&barrier);
/* Block signals on this thread. */
sigset_t set;
sigfillset (&set);
xpthread_sigmask (SIG_BLOCK, &set, NULL);
/* Send the signal to this thread. It must not be delivered. */
raise (SIGUSR1);
TEST_VERIFY (signal_thread == dummy);
/* Wait a bit to give a chance for signal delivery (increases
chances of failure with bug 28407). */
usleep (50 * 1000);
/* Unblocking should cause synchronous delivery of the signal. */
xpthread_sigmask (SIG_UNBLOCK, &set, NULL);
TEST_VERIFY (signal_thread == pthread_self ());
xpthread_cancel (helper);
xpthread_join (helper);
xpthread_join (dummy);
return 0;
}
#include <support/test-driver.c>
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