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970325b92d
g_object_weak_ref() documentation refers to GWeakRef as thread-safe replacement. However, it's not clear to me, how GWeakRef is a replacement for a callback. I think, it means, that you combine g_object_weak_ref() with GWeakRef, to both hold a (thread-safe) weak reference and get a notification on destruction. Add a test, that GWeakRef is already cleared inside the GWeakNotify callback.
299 lines
8.0 KiB
C
299 lines
8.0 KiB
C
/* GObject - GLib Type, Object, Parameter and Signal Library
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* Copyright (C) 2005 Red Hat, Inc.
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*
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* SPDX-License-Identifier: LGPL-2.1-or-later
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*
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* This library is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Lesser General Public
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* License as published by the Free Software Foundation; either
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* version 2.1 of the License, or (at your option) any later version.
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*
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* This library is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General
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* Public License along with this library; if not, see <http://www.gnu.org/licenses/>.
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*/
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#include <glib-object.h>
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/* This test tests weak and toggle references */
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static GObject *global_object;
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static gboolean object_destroyed;
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static gboolean weak_ref1_notified;
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static gboolean weak_ref2_notified;
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static gboolean toggle_ref1_weakened;
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static gboolean toggle_ref1_strengthened;
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static gboolean toggle_ref2_weakened;
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static gboolean toggle_ref2_strengthened;
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static gboolean toggle_ref3_weakened;
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static gboolean toggle_ref3_strengthened;
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/* TestObject, a parent class for TestObject */
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static GType test_object_get_type (void);
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#define TEST_TYPE_OBJECT (test_object_get_type ())
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typedef struct _TestObject TestObject;
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typedef struct _TestObjectClass TestObjectClass;
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struct _TestObject
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{
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GObject parent_instance;
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};
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struct _TestObjectClass
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{
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GObjectClass parent_class;
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};
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G_DEFINE_TYPE (TestObject, test_object, G_TYPE_OBJECT)
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static void
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test_object_finalize (GObject *object)
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{
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object_destroyed = TRUE;
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G_OBJECT_CLASS (test_object_parent_class)->finalize (object);
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}
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static void
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test_object_class_init (TestObjectClass *class)
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{
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GObjectClass *object_class = G_OBJECT_CLASS (class);
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object_class->finalize = test_object_finalize;
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}
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static void
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test_object_init (TestObject *test_object)
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{
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}
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static void
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clear_flags (void)
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{
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object_destroyed = FALSE;
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weak_ref1_notified = FALSE;
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weak_ref2_notified = FALSE;
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toggle_ref1_weakened = FALSE;
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toggle_ref1_strengthened = FALSE;
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toggle_ref2_weakened = FALSE;
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toggle_ref2_strengthened = FALSE;
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toggle_ref3_weakened = FALSE;
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toggle_ref3_strengthened = FALSE;
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}
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static void
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weak_ref1 (gpointer data,
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GObject *object)
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{
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g_assert_true (object == global_object);
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g_assert_cmpint (GPOINTER_TO_INT (data), ==, 42);
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weak_ref1_notified = TRUE;
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}
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static void
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weak_ref2 (gpointer data,
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GObject *object)
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{
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g_assert_true (object == global_object);
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g_assert_cmpint (GPOINTER_TO_INT (data), ==, 24);
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weak_ref2_notified = TRUE;
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}
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static void
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weak_ref3 (gpointer data,
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GObject *object)
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{
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GWeakRef *weak_ref = data;
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g_assert_null (g_weak_ref_get (weak_ref));
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weak_ref2_notified = TRUE;
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}
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static void
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toggle_ref1 (gpointer data,
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GObject *object,
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gboolean is_last_ref)
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{
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g_assert_true (object == global_object);
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g_assert_cmpint (GPOINTER_TO_INT (data), ==, 42);
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if (is_last_ref)
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toggle_ref1_weakened = TRUE;
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else
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toggle_ref1_strengthened = TRUE;
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}
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static void
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toggle_ref2 (gpointer data,
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GObject *object,
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gboolean is_last_ref)
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{
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g_assert_true (object == global_object);
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g_assert_cmpint (GPOINTER_TO_INT (data), ==, 24);
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if (is_last_ref)
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toggle_ref2_weakened = TRUE;
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else
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toggle_ref2_strengthened = TRUE;
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}
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static void
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toggle_ref3 (gpointer data,
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GObject *object,
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gboolean is_last_ref)
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{
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g_assert_true (object == global_object);
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g_assert_cmpint (GPOINTER_TO_INT (data), ==, 34);
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if (is_last_ref)
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{
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toggle_ref3_weakened = TRUE;
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g_object_remove_toggle_ref (object, toggle_ref3, GUINT_TO_POINTER (34));
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}
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else
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toggle_ref3_strengthened = TRUE;
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}
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static void
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test_references (void)
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{
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GObject *object;
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GWeakRef weak_ref;
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/* Test basic weak reference operation */
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global_object = object = g_object_new (TEST_TYPE_OBJECT, NULL);
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g_object_weak_ref (object, weak_ref1, GUINT_TO_POINTER (42));
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clear_flags ();
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g_object_unref (object);
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g_assert_true (weak_ref1_notified);
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g_assert_true (object_destroyed);
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/* Test two weak references at once
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*/
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global_object = object = g_object_new (TEST_TYPE_OBJECT, NULL);
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g_object_weak_ref (object, weak_ref1, GUINT_TO_POINTER (42));
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g_object_weak_ref (object, weak_ref2, GUINT_TO_POINTER (24));
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clear_flags ();
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g_object_unref (object);
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g_assert_true (weak_ref1_notified);
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g_assert_true (weak_ref2_notified);
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g_assert_true (object_destroyed);
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/* Test remove weak references */
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global_object = object = g_object_new (TEST_TYPE_OBJECT, NULL);
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g_object_weak_ref (object, weak_ref1, GUINT_TO_POINTER (42));
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g_object_weak_ref (object, weak_ref2, GUINT_TO_POINTER (24));
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g_object_weak_unref (object, weak_ref1, GUINT_TO_POINTER (42));
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clear_flags ();
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g_object_unref (object);
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g_assert_false (weak_ref1_notified);
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g_assert_true (weak_ref2_notified);
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g_assert_true (object_destroyed);
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/* Test that within a GWeakNotify the GWeakRef is NULL already. */
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weak_ref2_notified = FALSE;
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object = g_object_new (G_TYPE_OBJECT, NULL);
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g_weak_ref_init (&weak_ref, object);
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g_assert_true (object == g_weak_ref_get (&weak_ref));
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g_object_weak_ref (object, weak_ref3, &weak_ref);
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g_object_unref (object);
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g_object_unref (object);
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g_assert_true (weak_ref2_notified);
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g_weak_ref_clear (&weak_ref);
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/* Test basic toggle reference operation */
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global_object = object = g_object_new (TEST_TYPE_OBJECT, NULL);
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g_object_add_toggle_ref (object, toggle_ref1, GUINT_TO_POINTER (42));
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clear_flags ();
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g_object_unref (object);
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g_assert_true (toggle_ref1_weakened);
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g_assert_false (toggle_ref1_strengthened);
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g_assert_false (object_destroyed);
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clear_flags ();
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g_object_ref (object);
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g_assert_false (toggle_ref1_weakened);
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g_assert_true (toggle_ref1_strengthened);
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g_assert_false (object_destroyed);
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g_object_unref (object);
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clear_flags ();
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g_object_remove_toggle_ref (object, toggle_ref1, GUINT_TO_POINTER (42));
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g_assert_false (toggle_ref1_weakened);
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g_assert_false (toggle_ref1_strengthened);
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g_assert_true (object_destroyed);
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global_object = object = g_object_new (TEST_TYPE_OBJECT, NULL);
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/* Test two toggle references at once */
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g_object_add_toggle_ref (object, toggle_ref1, GUINT_TO_POINTER (42));
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g_object_add_toggle_ref (object, toggle_ref2, GUINT_TO_POINTER (24));
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clear_flags ();
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g_object_unref (object);
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g_assert_false (toggle_ref1_weakened);
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g_assert_false (toggle_ref1_strengthened);
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g_assert_false (toggle_ref2_weakened);
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g_assert_false (toggle_ref2_strengthened);
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g_assert_false (object_destroyed);
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clear_flags ();
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g_object_remove_toggle_ref (object, toggle_ref1, GUINT_TO_POINTER (42));
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g_assert_false (toggle_ref1_weakened);
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g_assert_false (toggle_ref1_strengthened);
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g_assert_true (toggle_ref2_weakened);
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g_assert_false (toggle_ref2_strengthened);
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g_assert_false (object_destroyed);
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clear_flags ();
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/* Check that removing a toggle ref with %NULL data works fine. */
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g_object_remove_toggle_ref (object, toggle_ref2, NULL);
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g_assert_false (toggle_ref1_weakened);
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g_assert_false (toggle_ref1_strengthened);
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g_assert_false (toggle_ref2_weakened);
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g_assert_false (toggle_ref2_strengthened);
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g_assert_true (object_destroyed);
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/* Test a toggle reference that removes itself */
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global_object = object = g_object_new (TEST_TYPE_OBJECT, NULL);
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g_object_add_toggle_ref (object, toggle_ref3, GUINT_TO_POINTER (34));
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clear_flags ();
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g_object_unref (object);
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g_assert_true (toggle_ref3_weakened);
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g_assert_false (toggle_ref3_strengthened);
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g_assert_true (object_destroyed);
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}
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int
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main (int argc,
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char *argv[])
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{
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g_log_set_always_fatal (g_log_set_always_fatal (G_LOG_FATAL_MASK) |
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G_LOG_LEVEL_WARNING |
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G_LOG_LEVEL_CRITICAL);
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g_test_init (&argc, &argv, NULL);
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g_test_add_func ("/gobject/references", test_references);
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return g_test_run ();
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}
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