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