[jboss-jira] [JBoss JIRA] Commented: (JGRP-656) Flag to determine when a message is considered delivered

Flag to determine when a message is considered delivered -------------------------------------------------------- Key: JGRP-656 URL: http://jira.jboss.com/jira/browse/JGRP-656 Project: JGroups Issue Type: Feature Request Reporter: Bela Ban Assigned To: Bela Ban Fix For: 2.7, 2.6.2 Attachments: tmp.java Okay, I know what the problem is. When a multicast message is received from sender A, then a lock is acquired for A (or we block until A's done processing the message and releases the lock). When the receive() method would send more messages down the stack, that lock might get held for potentially a long time. So I made the following change: I assume that calling down() from within receive() means that the message has been *delivered*, so I release the lock held for A and someone else can now acquire that lock. If you comment the lines of ProtocolStack.down() and recompile JGroups, then you will always see a count of 1: public Object down(Event evt) { ReentrantLock lock=locks.remove(Thread.currentThread()); //if(lock != null && lock.isHeldByCurrentThread()) { // lock.unlock(); //if(log.isTraceEnabled()) // log.trace("released lock held by " + Thread.currentThread()); //} if(top_prot != null) return top_prot.down(evt); return null; } The issue here is that I don't want to block incoming calls just because the receive() method sends other messages. This is described in http://jira.jboss.com/jira/browse/JGRP-535. I might introduce a flag in ProtocolStack to configure this behavior...