client: Add wl_object_is_zombie() helper function

Add a helper function which determines whether or not an object is a
zombie.

[daniels: Extracted from Derek's bespoke-zombie patch as an intermediate
          step.]

Signed-off-by: Derek Foreman <derekf@osg.samsung.com>
Reviewed-by: Daniel Stone <daniels@collabora.com>

3 files changed, 14 insertions, 3 deletions

diff --git a/src/connection.c b/src/connection.c
index e92de79..2e234ea 100644
--- a/src/connection.c
+++ b/src/connection.c
@@ -831,6 +831,14 @@ wl_connection_demarshal(struct wl_connection *connection,
 	return NULL;
 }
 
+bool
+wl_object_is_zombie(struct wl_map *map, uint32_t id)
+{
+	struct wl_object *object = wl_map_lookup(map, id);
+
+	return (object == WL_ZOMBIE_OBJECT);
+}
+
 int
 wl_closure_lookup_objects(struct wl_closure *closure, struct wl_map *objects)
 {
@@ -852,7 +860,7 @@ wl_closure_lookup_objects(struct wl_closure *closure, struct wl_map *objects)
 			closure->args[i].o = NULL;
 
 			object = wl_map_lookup(objects, id);
-			if (object == WL_ZOMBIE_OBJECT) {
+			if (wl_object_is_zombie(objects, id)) {
 				/* references object we've already
 				 * destroyed client side */
 				object = NULL;
diff --git a/src/wayland-client.c b/src/wayland-client.c
index 795b4e9..126dd90 100644
--- a/src/wayland-client.c
+++ b/src/wayland-client.c
@@ -837,7 +837,7 @@ display_handle_delete_id(void *data, struct wl_display *display, uint32_t id)
 	if (!proxy)
 		wl_log("error: received delete_id for unknown id (%u)\n", id);
 
-	if (proxy && proxy != WL_ZOMBIE_OBJECT)
+	if (proxy && !wl_object_is_zombie(&display->objects, id))
 		proxy->flags |= WL_PROXY_FLAG_ID_DELETED;
 	else
 		wl_map_remove(&display->objects, id);
@@ -1253,7 +1253,7 @@ queue_event(struct wl_display *display, int len)
 		return 0;
 
 	proxy = wl_map_lookup(&display->objects, id);
-	if (!proxy || proxy == WL_ZOMBIE_OBJECT) {
+	if (!proxy || wl_object_is_zombie(&display->objects, id)) {
 		wl_connection_consume(display->connection, size);
 		return size;
 	}
diff --git a/src/wayland-private.h b/src/wayland-private.h
index 93cec6b..c82b1f3 100644
--- a/src/wayland-private.h
+++ b/src/wayland-private.h
@@ -190,6 +190,9 @@ wl_connection_demarshal(struct wl_connection *connection,
 			struct wl_map *objects,
 			const struct wl_message *message);
 
+bool
+wl_object_is_zombie(struct wl_map *map, uint32_t id);
+
 int
 wl_closure_lookup_objects(struct wl_closure *closure, struct wl_map *objects);