+#ifdef WISH_PLIB_WAS_THREADED // but it isn't
+ /**
+ * Remove a tile from memory.
+ * @param tile The tile to be removed from memory.
+ */
+ void remove( FGTileEntry* tile );
+#endif
+
+ /**
+ * The tile loader thread will only load one tile per call to the
+ * update() method. This is a way to spread out the work of the
+ * tile loader and slow it down so it is less intrusive. For
+ * systems built without thead support this is a no-op.
+ */
+ void update();
+