[glib] Add work-around for Bug 627724

[David Zeuthen <davidz src gnome org>]

commit 0b74058fa3144f85b5fefd4c81129b971010452a
Author: David Zeuthen <davidz redhat com>
Date:   Fri Sep 10 16:21:37 2010 -0400

    Add work-around for Bug 627724
    
    The root problem is with GObject - for now, just work around it in
    GDBus. Also include a test-case. See
    
     https://bugzilla.gnome.org/show_bug.cgi?id=627724
    
    for more information.
    
    Signed-off-by: David Zeuthen <davidz redhat com>

 gio/gdbusprivate.c         |   44 +++++++++++++++++++-
 gio/tests/Makefile.am      |    4 ++
 gio/tests/gdbus-bz627724.c |   94 ++++++++++++++++++++++++++++++++++++++++++++
 3 files changed, 140 insertions(+), 2 deletions(-)
---
diff --git a/gio/gdbusprivate.c b/gio/gdbusprivate.c
index ca2680b..ba4ecb1 100644
--- a/gio/gdbusprivate.c
+++ b/gio/gdbusprivate.c
@@ -229,6 +229,34 @@ _g_socket_read_with_control_messages_finish (GSocket       *socket,
 
 /* ---------------------------------------------------------------------------------------------------- */
 
+/* Work-around for https://bugzilla.gnome.org/show_bug.cgi?id=627724 */
+
+static GPtrArray *ensured_classes = NULL;
+
+static void
+ensure_type (GType gtype)
+{
+  g_ptr_array_add (ensured_classes, g_type_class_ref (gtype));
+}
+
+static void
+released_required_types (void)
+{
+  g_ptr_array_foreach (ensured_classes, (GFunc) g_type_class_unref, NULL);
+  g_ptr_array_unref (ensured_classes);
+  ensured_classes = NULL;
+}
+
+static void
+ensure_required_types (void)
+{
+  g_assert (ensured_classes == NULL);
+  ensured_classes = g_ptr_array_new ();
+  ensure_type (G_TYPE_SIMPLE_ASYNC_RESULT);
+  ensure_type (G_TYPE_MEMORY_INPUT_STREAM);
+}
+/* ---------------------------------------------------------------------------------------------------- */
+
 G_LOCK_DEFINE_STATIC (shared_thread_lock);
 
 typedef struct
@@ -242,7 +270,7 @@ typedef struct
 static SharedThreadData *shared_thread_data = NULL;
 
 static gpointer
-shared_thread_func (gpointer data)
+gdbus_shared_thread_func (gpointer data)
 {
   g_main_context_push_thread_default (shared_thread_data->context);
   g_main_loop_run (shared_thread_data->loop);
@@ -268,6 +296,8 @@ invoke_caller (gpointer user_data)
   return FALSE;
 }
 
+/* ---------------------------------------------------------------------------------------------------- */
+
 static void
 _g_dbus_shared_thread_ref (GDBusSharedThreadFunc func,
                            gpointer              user_data)
@@ -275,9 +305,12 @@ _g_dbus_shared_thread_ref (GDBusSharedThreadFunc func,
   GError *error;
   GSource *idle_source;
   CallerData *data;
+  gboolean release_types;
 
   G_LOCK (shared_thread_lock);
 
+  release_types = FALSE;
+
   if (shared_thread_data != NULL)
     {
       shared_thread_data->num_users += 1;
@@ -287,10 +320,14 @@ _g_dbus_shared_thread_ref (GDBusSharedThreadFunc func,
   shared_thread_data = g_new0 (SharedThreadData, 1);
   shared_thread_data->num_users = 1;
 
+  /* Work-around for https://bugzilla.gnome.org/show_bug.cgi?id=627724 */
+  ensure_required_types ();
+  release_types = TRUE;
+
   error = NULL;
   shared_thread_data->context = g_main_context_new ();
   shared_thread_data->loop = g_main_loop_new (shared_thread_data->context, FALSE);
-  shared_thread_data->thread = g_thread_create (shared_thread_func,
+  shared_thread_data->thread = g_thread_create (gdbus_shared_thread_func,
                                                 NULL,
                                                 TRUE,
                                                 &error);
@@ -316,6 +353,9 @@ _g_dbus_shared_thread_ref (GDBusSharedThreadFunc func,
   while (!data->done)
     g_thread_yield ();
 
+  if (release_types)
+    released_required_types ();
+
   g_free (data);
 
   G_UNLOCK (shared_thread_lock);
diff --git a/gio/tests/Makefile.am b/gio/tests/Makefile.am
index d5d679e..8e42a90 100644
--- a/gio/tests/Makefile.am
+++ b/gio/tests/Makefile.am
@@ -57,6 +57,7 @@ TEST_PROGS +=			\
 	gdbus-peer		\
 	gdbus-exit-on-close	\
 	gdbus-non-socket	\
+	gdbus-bz627724		\
 	application		\
 	testapps		\
 	appinfo			\
@@ -217,6 +218,9 @@ endif
 gdbus_addresses_SOURCES = gdbus-addresses.c
 gdbus_addresses_LDADD = $(progs_ldadd)
 
+gdbus_bz627724_SOURCES = gdbus-bz627724.c gdbus-sessionbus.c gdbus-sessionbus.h gdbus-tests.h gdbus-tests.c
+gdbus_bz627724_LDADD = $(progs_ldadd)
+
 gdbus_connection_SOURCES = gdbus-connection.c gdbus-sessionbus.c gdbus-sessionbus.h gdbus-tests.h gdbus-tests.c
 gdbus_connection_LDADD = $(progs_ldadd)
 
diff --git a/gio/tests/gdbus-bz627724.c b/gio/tests/gdbus-bz627724.c
new file mode 100644
index 0000000..03d196e
--- /dev/null
+++ b/gio/tests/gdbus-bz627724.c
@@ -0,0 +1,94 @@
+/* GLib testing framework examples and tests
+ *
+ * Copyright (C) 2008-2010 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.
+ *
+ * Author: David Zeuthen <davidz redhat com>
+ */
+
+#include <gio/gio.h>
+#include <unistd.h>
+#include <string.h>
+
+#include "gdbus-tests.h"
+
+static GDBusConnection *the_connection = NULL;
+
+#define MY_TYPE_OBJECT   (my_object_get_type ())
+#define MY_OBJECT(o)     (G_TYPE_CHECK_INSTANCE_CAST ((o), MY_TYPE_OBJECT, MyObject))
+#define MY_IS_OBJECT(o)  (G_TYPE_CHECK_INSTANCE_TYPE ((o), MY_TYPE_OBJECT))
+
+typedef struct {
+  GObject parent_instance;
+} MyObject;
+
+typedef struct {
+  GObjectClass parent_class;
+} MyObjectClass;
+
+GType my_object_get_type (void) G_GNUC_CONST;
+
+G_DEFINE_TYPE (MyObject, my_object, G_TYPE_OBJECT);
+
+static void
+my_object_init (MyObject *object)
+{
+}
+
+static void
+my_object_class_init (MyObjectClass *klass)
+{
+  GError *error;
+  error = NULL;
+  the_connection = g_bus_get_sync (G_BUS_TYPE_SESSION,
+                                   NULL, /* GCancellable* */
+                                   &error);
+  g_assert_no_error (error);
+  g_assert (G_IS_DBUS_CONNECTION (the_connection));
+}
+
+static void
+test_bz627724 (void)
+{
+  MyObject *object;
+
+  session_bus_up ();
+  g_assert (the_connection == NULL);
+  object = g_object_new (MY_TYPE_OBJECT, NULL);
+  g_assert (the_connection != NULL);
+  g_object_unref (the_connection);
+  g_object_unref (object);
+  session_bus_down ();
+}
+
+
+int
+main (int   argc,
+      char *argv[])
+{
+  g_type_init ();
+  g_test_init (&argc, &argv, NULL);
+
+  /* all the tests use a session bus with a well-known address that we can bring up and down
+   * using session_bus_up() and session_bus_down().
+   */
+  g_unsetenv ("DISPLAY");
+  g_setenv ("DBUS_SESSION_BUS_ADDRESS", session_bus_get_temporary_address (), TRUE);
+
+  g_test_add_func ("/gdbus/bz627724", test_bz627724);
+  return g_test_run();
+}