Checkpoint - all src/ except src/input

src/threading/Queue.h

@@ -53,6 +53,13 @@ public:
 	 */
 	bool Ready();
 
+	/**
+	 * Returns true if the next Get() operation might succeed.
+	 * This function may occasionally return a value not
+	 * indicating the actual state, but won't do so very often.
+	 */
+	bool MaybeReady() { return ( ( read_ptr - write_ptr) != 0 ); }
+
 	/**
 	 * Returns the number of queued items not yet retrieved.
 	 */