libweston-desktop: introduce weston_desktop_client_destroy()

This new function is callable explicitly, unlike the old function that
used to have the same name.

This will be needed when tearing down what
weston_desktop_xwayland_init() puts up.

Since calling weston_desktop_client_destroy() for an external client
(one that has a wl_resource for this) is a bug, add asserts to prevent
it. This will only be needed for the internal client: XWM.

Signed-off-by: Pekka Paalanen <pekka.paalanen@collabora.com>

libweston-desktop/client.c

@@ -24,6 +24,7 @@
 #include "config.h"
 
 #include <wayland-server.h>
+#include <assert.h>
 
 #include <libweston/libweston.h>
 #include <libweston/zalloc.h>
@@ -48,14 +49,14 @@ weston_desktop_client_add_destroy_listener(struct weston_desktop_client *client,
 	wl_signal_add(&client->destroy_signal, listener);
 }
 
-static void
+void
-weston_desktop_client_handle_destroy(struct wl_resource *resource)
+weston_desktop_client_destroy(struct weston_desktop_client *client)
 {
-	struct weston_desktop_client *client =
-		wl_resource_get_user_data(resource);
 	struct wl_list *list = &client->surface_list;
 	struct wl_list *link, *tmp;
 
+	assert(client->resource == NULL);
+
 	wl_signal_emit(&client->destroy_signal, client);
 
 	for (link = list->next, tmp = link->next;
@@ -71,6 +72,18 @@ weston_desktop_client_handle_destroy(struct wl_resource *resource)
 	free(client);
 }
 
+static void
+weston_desktop_client_handle_destroy(struct wl_resource *resource)
+{
+	struct weston_desktop_client *client =
+		wl_resource_get_user_data(resource);
+
+	assert(client->resource == resource);
+	client->resource = NULL;
+
+	weston_desktop_client_destroy(client);
+}
+
 static int
 weston_desktop_client_ping_timeout(void *user_data)
 {

libweston-desktop/internal.h

@@ -134,6 +134,8 @@ weston_desktop_client_create(struct weston_desktop *desktop,
 			     const struct wl_interface *interface,
 			     const void *implementation, uint32_t version,
 			     uint32_t id);
+void
+weston_desktop_client_destroy(struct weston_desktop_client *client);
 
 void
 weston_desktop_client_add_destroy_listener(struct weston_desktop_client *client,