/* Test of pthread_sigmask in a multi-threaded program.

   Copyright (C) 2011-2019 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);

  /* Clean up the thread.  This avoid a "ThreadSanitizer: thread leak" warning

     from "gcc -fsanitize=thread".  */

  gl_thread_join (killer_thread, NULL);

  return 0;

}

#else

int

main ()

{

  fputs ("Skipping test: POSIX threads not enabled\n", stderr);

  return 77;

}

#endif