glib/glib/tests/once.c

/* Unit tests for GOnce and friends
 * Copyright (C) 2011 Red Hat, Inc
 * Author: Matthias Clasen
 *
 * This work is provided "as is"; redistribution and modification
 * in whole or in part, in any medium, physical or electronic is
 * permitted without restriction.
 *
 * This work 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.
 *
 * In no event shall the authors or contributors be liable for any
 * direct, indirect, incidental, special, exemplary, or consequential
 * damages (including, but not limited to, procurement of substitute
 * goods or services; loss of use, data, or profits; or business
 * interruption) however caused and on any theory of liability, whether
 * in contract, strict liability, or tort (including negligence or
 * otherwise) arising in any way out of the use of this software, even
 * if advised of the possibility of such damage.
 */

#include <glib.h>

static gpointer
do_once (gpointer data)
{
  static gint i = 0;

  i++;

  return GINT_TO_POINTER (i);
}

static void
test_once1 (void)
{
  GOnce once = G_ONCE_INIT;
  gpointer res;

  g_assert (once.status == G_ONCE_STATUS_NOTCALLED);

  res = g_once (&once, do_once, NULL);
  g_assert_cmpint (GPOINTER_TO_INT (res), ==, 1);

  g_assert (once.status == G_ONCE_STATUS_READY);

  res = g_once (&once, do_once, NULL);
  g_assert_cmpint (GPOINTER_TO_INT (res), ==, 1);
}

static void
test_once2 (void)
{
  static gsize init = 0;

  if (g_once_init_enter (&init))
    {
      g_assert (TRUE);
      g_once_init_leave (&init, 1);
    }

  g_assert_cmpint (init, ==, 1);
  if (g_once_init_enter (&init))
    {
      g_assert_not_reached ();
      g_once_init_leave (&init, 2);
    }
  g_assert_cmpint (init, ==, 1);
}

#define THREADS 100

static gint64 shared;

static void
init_shared (void)
{
  static gsize init = 0;

  if (g_once_init_enter (&init))
    {
      shared += 42;

      g_once_init_leave (&init, 1);
    }
}

static gpointer
thread_func (gpointer data)
{
  init_shared ();

  return NULL;
}

static void
test_once3 (void)
{
  gint i;
  GThread *threads[THREADS];

  shared = 0;

  for (i = 0; i < THREADS; i++)
    threads[i] = g_thread_new ("once3", thread_func, NULL);

  for (i = 0; i < THREADS; i++)
    g_thread_join (threads[i]);

  g_assert_cmpint (shared, ==, 42);
}

static void
test_once4 (void)
{
  static const gchar *val;

  if (g_once_init_enter (&val))
    g_once_init_leave (&val, "foo");

  g_assert_cmpstr (val, ==, "foo");
}

int
main (int argc, char *argv[])
{
  g_test_init (&argc, &argv, NULL);

  g_test_add_func ("/thread/once1", test_once1);
  g_test_add_func ("/thread/once2", test_once2);
  g_test_add_func ("/thread/once3", test_once3);
  g_test_add_func ("/thread/once4", test_once4);

  return g_test_run ();
}