--- a/src/fdl/MetaLinda.java	Thu Aug 21 18:46:40 2008 +0900
+++ b/src/fdl/MetaLinda.java	Fri Aug 22 14:48:41 2008 +0900
@@ -14,6 +14,7 @@
 
 import java.io.IOException;
 import java.nio.ByteBuffer;
+import java.util.LinkedList;
 
 /**
  MetaLinda 
@@ -31,8 +32,7 @@
 	public FDLindaServ fds;
 	public FederatedLinda fdl=null;
 	public PSXLinda next=null;
-	private MetaReply replies=new MetaReply(0, 0, ts);
-	private MetaReply last=replies;
+	private LinkedList<MetaReply> replies=new LinkedList<MetaReply>();
 
 	public MetaLinda(TupleSpace ts,FDLindaServ fds) {
 		this.ts = ts;
@@ -49,7 +49,7 @@
 	}
 
 	private void addReply(MetaReply r) {
-		last.next = r; last = r;
+		replies.add(r);
 	}
 
 	public PSXReply ck(int id) {
@@ -100,14 +100,14 @@
 
 	public int sync(long timeout) {
 		fds.checkTuple(timeout);
-		PSXReply r;
-		for(r=replies;r!=null&&r.next!=null;r = r.next) {
-			if (r.next.ready()) {
-				// ready() may modify replies list
-				r.next = r.next.next;
+		// copy replies to avoid insert during r.ready() 
+		LinkedList<MetaReply> list = replies;
+		replies = new LinkedList<MetaReply>();
+		for(MetaReply r:list) {
+			if (!r.ready()) {
+				addReply(r);
 			}
 		}
-		last = (MetaReply)r;
 		if (fdl!=null) {
 			try {
 				fdl.sync(timeout);