/* Copyright (C) 2015-2018 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

   <http://www.gnu.org/licenses/>.  */

#include <errno.h>

#include <pthread.h>

#include <stdio.h>

#include <string.h>

static pthread_once_t once = PTHREAD_ONCE_INIT;

// Exception type thrown from the pthread_once init routine.

struct OnceException { };

// Test iteration counter.

static int niter;

static void

init_routine (void)

{

  if (niter < 2)

    throw OnceException ();

}

// Verify that an exception thrown from the pthread_once init routine

// is propagated to the pthread_once caller and that the function can

// be subsequently invoked to attempt the initialization again.

static int

do_test (void)

{

  int result = 1;

  // Repeat three times, having the init routine throw the first two

  // times and succeed on the final attempt.

  for (niter = 0; niter != 3; ++niter) {

    try {

      int rc = pthread_once (&once, init_routine);

      if (rc)

        fprintf (stderr, "pthread_once failed: %i (%s)\n",

                 rc, strerror (rc));

      if (niter < 2)

        fputs ("pthread_once unexpectedly returned without"

               " throwing an exception", stderr);

    }

    catch (OnceException) {

      if (1 < niter)

        fputs ("pthread_once unexpectedly threw", stderr);

      result = 0;

    }

    catch (...) {

      fputs ("pthread_once threw an unknown exception", stderr);

    }

    // Abort the test on the first failure.

    if (result)

      break;

  }

  return result;

}

// The test currently hangs and is XFAILed.  Reduce the timeout.

#define TIMEOUT 1

#define TEST_FUNCTION do_test ()

#include "../test-skeleton.c"