glib/tests/gobject/references.c
Owen Taylor 2ae1a46b4c Add g_object_add/remove_toggle_ref() functions to get notification when a
2005-05-05  Owen Taylor  <otaylor@redhat.com>

        * gobject.[ch] gobject.symbols: Add
        g_object_add/remove_toggle_ref() functions to get notification
        when a reference count is the last remaining reference; this
        enables better memory management for language bindings.
        (http://mail.gnome.org/archives/gtk-devel-list/2005-April/msg00095.html)

2005-05-05  Owen Taylor  <otaylor@redhat.com>

        * glib/gdataset.[ch] glib/gdatasetprivate.h: Add
        g_datalist_set/unset_flags(), g_datalist_get_flags() functions
        to squeeze some bits into a GDataSet... this is needed for
        efficient implementation of toggle references in GObject.

        * tests/gobject/references.c tests/gobject/Makefile.am:
        Add a test case for weak and toggle references.

        * glib/gfileutils.[ch]: Rename g_file_replace() back
        to g_file_set_contents().

        * glib/glib.symbols: Update.

2005-05-05  Owen Taylor  <otaylor@redhat.com>

        * glib/Makefile.am glib/glib-sections.txt gobject/gobject-sections.txt:
        Update

        * gobject/tmpl/objects.sgml: Document toggle-references.
2005-05-05 14:57:29 +00:00

282 lines
7.4 KiB
C

/* GObject - GLib Type, Object, Parameter and Signal Library
* Copyright (C) 2005 Red Hat, Inc.
*
* This 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 of the License, or (at your option) any later version.
*
* This 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 this library; if not, write to the
* Free Software Foundation, Inc., 59 Temple Place, Suite 330,
* Boston, MA 02111-1307, USA.
*/
#undef G_LOG_DOMAIN
#define G_LOG_DOMAIN "TestReferences"
#undef G_DISABLE_ASSERT
#undef G_DISABLE_CHECKS
#undef G_DISABLE_CAST_CHECKS
#include <glib-object.h>
/* This test tests weak and toggle references
*/
static GObject *global_object;
static gboolean object_destroyed;
static gboolean weak_ref1_notified;
static gboolean weak_ref2_notified;
static gboolean toggle_ref1_weakened;
static gboolean toggle_ref1_strengthened;
static gboolean toggle_ref2_weakened;
static gboolean toggle_ref2_strengthened;
static gboolean toggle_ref3_weakened;
static gboolean toggle_ref3_strengthened;
/*
* TestObject, a parent class for TestObject
*/
#define TEST_TYPE_OBJECT (test_object_get_type ())
typedef struct _TestObject TestObject;
typedef struct _TestObjectClass TestObjectClass;
struct _TestObject
{
GObject parent_instance;
};
struct _TestObjectClass
{
GObjectClass parent_class;
};
G_DEFINE_TYPE (TestObject, test_object, G_TYPE_OBJECT);
static void
test_object_finalize (GObject *object)
{
object_destroyed = TRUE;
G_OBJECT_CLASS (test_object_parent_class)->finalize (object);
}
static void
test_object_class_init (TestObjectClass *class)
{
GObjectClass *object_class = G_OBJECT_CLASS (class);
object_class->finalize = test_object_finalize;
}
static void
test_object_init (TestObject *test_object)
{
}
static void
clear_flags (void)
{
object_destroyed = FALSE;
weak_ref1_notified = FALSE;
weak_ref2_notified = FALSE;
toggle_ref1_weakened = FALSE;
toggle_ref1_strengthened = FALSE;
toggle_ref2_weakened = FALSE;
toggle_ref2_strengthened = FALSE;
toggle_ref3_weakened = FALSE;
toggle_ref3_strengthened = FALSE;
}
static void
weak_ref1 (gpointer data,
GObject *object)
{
g_assert (object == global_object);
g_assert (data == GUINT_TO_POINTER (42));
weak_ref1_notified = TRUE;
}
static void
weak_ref2 (gpointer data,
GObject *object)
{
g_assert (object == global_object);
g_assert (data == GUINT_TO_POINTER (24));
weak_ref2_notified = TRUE;
}
static void
toggle_ref1 (gpointer data,
GObject *object,
gboolean is_last_ref)
{
g_assert (object == global_object);
g_assert (data == GUINT_TO_POINTER (42));
if (is_last_ref)
toggle_ref1_weakened = TRUE;
else
toggle_ref1_strengthened = TRUE;
}
static void
toggle_ref2 (gpointer data,
GObject *object,
gboolean is_last_ref)
{
g_assert (object == global_object);
g_assert (data == GUINT_TO_POINTER (24));
if (is_last_ref)
toggle_ref2_weakened = TRUE;
else
toggle_ref2_strengthened = TRUE;
}
static void
toggle_ref3 (gpointer data,
GObject *object,
gboolean is_last_ref)
{
g_assert (object == global_object);
g_assert (data == GUINT_TO_POINTER (34));
if (is_last_ref)
{
toggle_ref3_weakened = TRUE;
g_object_remove_toggle_ref (object, toggle_ref3, GUINT_TO_POINTER (34));
}
else
toggle_ref3_strengthened = TRUE;
}
int
main (int argc,
char *argv[])
{
GObject *object;
g_log_set_always_fatal (g_log_set_always_fatal (G_LOG_FATAL_MASK) |
G_LOG_LEVEL_WARNING |
G_LOG_LEVEL_CRITICAL);
g_type_init ();
/* Test basic weak reference operation
*/
global_object = object = g_object_new (TEST_TYPE_OBJECT, NULL);
g_object_weak_ref (object, weak_ref1, GUINT_TO_POINTER (42));
clear_flags ();
g_object_unref (object);
g_assert (weak_ref1_notified == TRUE);
g_assert (object_destroyed == TRUE);
/* Test two weak references at once
*/
global_object = object = g_object_new (TEST_TYPE_OBJECT, NULL);
g_object_weak_ref (object, weak_ref1, GUINT_TO_POINTER (42));
g_object_weak_ref (object, weak_ref2, GUINT_TO_POINTER (24));
clear_flags ();
g_object_unref (object);
g_assert (weak_ref1_notified == TRUE);
g_assert (weak_ref2_notified == TRUE);
g_assert (object_destroyed == TRUE);
/* Test remove weak references
*/
global_object = object = g_object_new (TEST_TYPE_OBJECT, NULL);
g_object_weak_ref (object, weak_ref1, GUINT_TO_POINTER (42));
g_object_weak_ref (object, weak_ref2, GUINT_TO_POINTER (24));
g_object_weak_unref (object, weak_ref1, GUINT_TO_POINTER (42));
clear_flags ();
g_object_unref (object);
g_assert (weak_ref1_notified == FALSE);
g_assert (weak_ref2_notified == TRUE);
g_assert (object_destroyed == TRUE);
/* Test basic toggle reference operation
*/
global_object = object = g_object_new (TEST_TYPE_OBJECT, NULL);
g_object_add_toggle_ref (object, toggle_ref1, GUINT_TO_POINTER (42));
clear_flags ();
g_object_unref (object);
g_assert (toggle_ref1_weakened == TRUE);
g_assert (toggle_ref1_strengthened == FALSE);
g_assert (object_destroyed == FALSE);
clear_flags ();
g_object_ref (object);
g_assert (toggle_ref1_weakened == FALSE);
g_assert (toggle_ref1_strengthened == TRUE);
g_assert (object_destroyed == FALSE);
g_object_unref (object);
clear_flags ();
g_object_remove_toggle_ref (object, toggle_ref1, GUINT_TO_POINTER (42));
g_assert (toggle_ref1_weakened == FALSE);
g_assert (toggle_ref1_strengthened == FALSE);
g_assert (object_destroyed == TRUE);
global_object = object = g_object_new (TEST_TYPE_OBJECT, NULL);
/* Test two toggle references at once
*/
g_object_add_toggle_ref (object, toggle_ref1, GUINT_TO_POINTER (42));
g_object_add_toggle_ref (object, toggle_ref2, GUINT_TO_POINTER (24));
clear_flags ();
g_object_unref (object);
g_assert (toggle_ref1_weakened == FALSE);
g_assert (toggle_ref1_strengthened == FALSE);
g_assert (toggle_ref2_weakened == FALSE);
g_assert (toggle_ref2_strengthened == FALSE);
g_assert (object_destroyed == FALSE);
clear_flags ();
g_object_remove_toggle_ref (object, toggle_ref1, GUINT_TO_POINTER (42));
g_assert (toggle_ref1_weakened == FALSE);
g_assert (toggle_ref1_strengthened == FALSE);
g_assert (toggle_ref2_weakened == TRUE);
g_assert (toggle_ref2_strengthened == FALSE);
g_assert (object_destroyed == FALSE);
clear_flags ();
g_object_remove_toggle_ref (object, toggle_ref2, GUINT_TO_POINTER (24));
g_assert (toggle_ref1_weakened == FALSE);
g_assert (toggle_ref1_strengthened == FALSE);
g_assert (toggle_ref2_weakened == FALSE);
g_assert (toggle_ref2_strengthened == FALSE);
g_assert (object_destroyed == TRUE);
/* Test a toggle reference that removes itself
*/
global_object = object = g_object_new (TEST_TYPE_OBJECT, NULL);
g_object_add_toggle_ref (object, toggle_ref3, GUINT_TO_POINTER (34));
clear_flags ();
g_object_unref (object);
g_assert (toggle_ref3_weakened == TRUE);
g_assert (toggle_ref3_strengthened == FALSE);
g_assert (object_destroyed == TRUE);
return 0;
}