--- a/src/main/java/jp/ac/u_ryukyu/treevnc/MyRfbProto.java	Thu May 01 18:04:39 2014 +0900
+++ b/src/main/java/jp/ac/u_ryukyu/treevnc/MyRfbProto.java	Thu May 01 19:12:05 2014 +0900
@@ -89,7 +89,7 @@
 				}
 			}
 		};
-		new Thread(timer).start();
+		new Thread(timer, "timer-discard-multicastqueue").start();
 		/**
 		 * discard all incoming from clients
 		 */
@@ -127,7 +127,6 @@
 				writerRunning.set(1);
 				try {
 					requestThreadNotify();
-					// rThread.checkDelay();
 
 					/**
 					 * initial connection of RFB protocol
@@ -140,8 +139,8 @@
 					sendSecResult(os);
 					readClientInit(is);
 					sendInitData(os);
-					new Thread(reader).start(); // discard incoming packet here
-												// after.
+					// after this, we discard upward packet.
+					new Thread(reader, "discard-upward-comm").start(); 
 					// writeFramebufferUpdateRequest(0,0, framebufferWidth,
 					// framebufferHeight, false );
 					for (;;) {
@@ -187,11 +186,11 @@
 			}
 		};
 		clients++;
-		new Thread(sender).start();
+		new Thread(sender, "writer-to-lower-node").start();
 
 	}
 	
-	public synchronized void requestThreadNotify() {
+	public void requestThreadNotify() {
 		rThread.reStart();
 	}