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+/* Test of pthread_sigmask in a multi-threaded program.
+ Copyright (C) 2011-2017 Free Software Foundation, Inc.
+
+ This program is free software: you can redistribute it and/or modify
+ it under the terms of the GNU General Public License as published by
+ the Free Software Foundation; either version 3 of the License, or
+ (at your option) any later version.
+
+ This program 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 General Public License for more details.
+
+ You should have received a copy of the GNU General Public License
+ along with this program. If not, see <https://www.gnu.org/licenses/>. */
+
+/* Written by Bruno Haible <bruno@clisp.org>, 2011. */
+
+#include <config.h>
+
+#include <signal.h>
+
+#include <errno.h>
+#include <stdio.h>
+#include <unistd.h>
+
+#include "glthread/thread.h"
+
+#include "macros.h"
+
+#if USE_POSIX_THREADS
+
+static gl_thread_t main_thread;
+static gl_thread_t killer_thread;
+
+static void *
+killer_thread_func (void *arg)
+{
+ sleep (1);
+ pthread_kill (main_thread, SIGINT);
+ return NULL;
+}
+
+static volatile int sigint_occurred;
+
+static void
+sigint_handler (int sig)
+{
+ sigint_occurred++;
+}
+
+int
+main (int argc, char *argv[])
+{
+ sigset_t set;
+
+ signal (SIGINT, sigint_handler);
+
+ sigemptyset (&set);
+ sigaddset (&set, SIGINT);
+
+ /* Check error handling. */
+ ASSERT (pthread_sigmask (1729, &set, NULL) == EINVAL);
+
+ /* Block SIGINT. */
+ ASSERT (pthread_sigmask (SIG_BLOCK, &set, NULL) == 0);
+
+ /* Request a SIGINT signal from another thread. */
+ main_thread = gl_thread_self ();
+ ASSERT (glthread_create (&killer_thread, killer_thread_func, NULL) == 0);
+
+ /* Wait. */
+ sleep (2);
+
+ /* The signal should not have arrived yet, because it is blocked. */
+ ASSERT (sigint_occurred == 0);
+
+ /* Unblock SIGINT. */
+ ASSERT (pthread_sigmask (SIG_UNBLOCK, &set, NULL) == 0);
+
+ /* The signal should have arrived now, because POSIX says
+ "If there are any pending unblocked signals after the call to
+ pthread_sigmask(), at least one of those signals shall be delivered
+ before the call to pthread_sigmask() returns." */
+ ASSERT (sigint_occurred == 1);
+
+ return 0;
+}
+
+#else
+
+int
+main ()
+{
+ fputs ("Skipping test: POSIX threads not enabled\n", stderr);
+ return 77;
+}
+
+#endif