/*

 * Author: Simon McVittie <simon.mcvittie@collabora.co.uk>

 * Copyright © 2011 Nokia Corporation

 *

 * This program 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.

 *

 * See the included COPYING file for more information.

 */

#define GLIB_DISABLE_DEPRECATION_WARNINGS

#include <glib.h>

/* On smcv's laptop, 1e4 iterations didn't always exhibit the bug, but 1e5

 * iterations exhibited it 10/10 times in practice. YMMV. */

#define ITERATIONS 100000

static GStaticPrivate sp;

static GMutex *mutex;

static GCond *cond;

static guint i;

static volatile gint freed = 0;

static void

notify (gpointer p)

{

  if (!g_atomic_int_compare_and_exchange (&freed, 0, 1))

    {

      g_error ("someone already freed it after %u iterations", i);

    }

}

static gpointer thread_func (gpointer nil)

{

  /* wait for main thread to reach its g_cond_wait call */

  g_mutex_lock (mutex);

  g_static_private_set (&sp, &sp, notify);

  g_cond_broadcast (cond);

  g_mutex_unlock (mutex);

  return nil;

}

static void

testcase (void)

{

  g_test_bug ("642026");

  mutex = g_mutex_new ();

  cond = g_cond_new ();

  g_mutex_lock (mutex);

  for (i = 0; i < ITERATIONS; i++)

    {

      GThread *t1;

      g_static_private_init (&sp);

      freed = 0;

      t1 = g_thread_create (thread_func, NULL, TRUE, NULL);

      g_assert (t1 != NULL);

      /* wait for t1 to set up its thread-private data */

      g_cond_wait (cond, mutex);

      /* exercise the bug, by racing with t1 to free the private data */

      g_static_private_free (&sp);

      g_thread_join (t1);

    }

  g_cond_free (cond);

  g_mutex_unlock (mutex);

  g_mutex_free (mutex);

}

int

main (int argc,

    char **argv)

{

  g_test_init (&argc, &argv, NULL);

  g_test_bug_base ("https://bugzilla.gnome.org/show_bug.cgi?id=");

  g_test_add_func ("/glib/642026", testcase);

  return g_test_run ();

}