[evolution] Revise the EShell ref-leak check to not upset Valgrind.

[Matthew Barnes <mbarnes src gnome org>]

commit ba05eccc8d0595fd229a25b5a62f302abe7ef479
Author: Matthew Barnes <mbarnes redhat com>
Date:   Wed Dec 2 16:49:44 2009 -0500

    Revise the EShell ref-leak check to not upset Valgrind.

 shell/e-shell.c |   11 +++++------
 shell/main.c    |   24 +++++++++++-------------
 2 files changed, 16 insertions(+), 19 deletions(-)
---
diff --git a/shell/e-shell.c b/shell/e-shell.c
index 130e0f0..157e003 100644
--- a/shell/e-shell.c
+++ b/shell/e-shell.c
@@ -91,8 +91,8 @@ static GDebugKey debug_keys[] = {
 	{ "settings",	DEBUG_KEY_SETTINGS }
 };
 
-EShell *default_shell = NULL;
 static gpointer parent_class;
+static gpointer default_shell;
 static guint signals[LAST_SIGNAL];
 
 #if defined(NM_SUPPORT) && NM_SUPPORT
@@ -624,8 +624,10 @@ static void
 shell_constructed (GObject *object)
 {
 	/* The first EShell instance is the default. */
-	if (default_shell == NULL)
-		default_shell = g_object_ref (object);
+	if (default_shell == NULL) {
+		default_shell = object;
+		g_object_add_weak_pointer (object, &default_shell);
+	}
 
 	/* UniqueApp will have by this point determined whether we're
 	 * the only Evolution process running.  If so, proceed normally.
@@ -1148,9 +1150,6 @@ e_shell_get_type (void)
 EShell *
 e_shell_get_default (void)
 {
-	/* Emit a warning if we call this too early. */
-	g_return_val_if_fail (default_shell != NULL, NULL);
-
 	return default_shell;
 }
 
diff --git a/shell/main.c b/shell/main.c
index c1a4e5d..81a6a81 100644
--- a/shell/main.c
+++ b/shell/main.c
@@ -93,9 +93,6 @@ static gchar *requested_view = NULL;
 static gchar *evolution_debug_log = NULL;
 static gchar **remaining_args;
 
-/* Defined in <e-shell.h> */
-extern EShell *default_shell;
-
 static void
 categories_icon_theme_hack (void)
 {
@@ -397,7 +394,7 @@ shell_force_shutdown (void)
 	g_assert_not_reached ();
 }
 
-static void
+static EShell *
 create_default_shell (void)
 {
 	EShell *shell;
@@ -441,11 +438,9 @@ create_default_shell (void)
 
 	g_object_unref (client);
 
-	/* EShell keeps its own reference to the first instance for use
-	 * in e_shell_get_default(), so it's safe to unreference here. */
-	g_object_unref (shell);
-
 	g_idle_add ((GSourceFunc) idle_cb, remaining_args);
+
+	return shell;
 }
 
 #ifdef G_OS_WIN32
@@ -455,6 +450,7 @@ extern void link_shutdown (void);
 gint
 main (gint argc, gchar **argv)
 {
+	EShell *shell;
 	GtkIconTheme *icon_theme;
 	GConfClient *client;
 #ifdef DEVELOPMENT
@@ -580,7 +576,7 @@ main (gint argc, gchar **argv)
 
 	g_object_unref (client);
 
-	create_default_shell ();
+	shell = create_default_shell ();
 
 	if (!disable_eplugin) {
 		/* Register built-in plugin hook types. */
@@ -597,14 +593,16 @@ main (gint argc, gchar **argv)
 
 	/* Attempt migration -after- loading all modules and plugins,
 	 * as both shell backends and certain plugins hook into this. */
-	e_shell_migrate_attempt (default_shell);
+	e_shell_migrate_attempt (shell);
 
 	gtk_main ();
 
 	/* Drop what should be the last reference to the shell.
-	 * Emit a warning if references are leaking somewhere. */
-	g_object_unref (default_shell);
-	if (E_IS_SHELL (default_shell))
+	 * That will cause e_shell_get_default() to henceforth
+	 * return NULL.  Use that to check for reference leaks. */
+	g_object_unref (shell);
+
+	if (e_shell_get_default () != NULL)
 		g_warning ("Shell not finalized on exit");
 
 	gtk_accel_map_save (e_get_accels_filename ());