[jboss-jira] [JBoss JIRA] Resolved: (JGRP-457) Optimization: make threads return immediately if NAKACK has another active thread for the same sender

Optimization: make threads return immediately if NAKACK has another active thread for the same sender ----------------------------------------------------------------------------------------------------- Key: JGRP-457 URL: http://jira.jboss.com/jira/browse/JGRP-457 Project: JGroups Issue Type: Feature Request Reporter: Bela Ban Assigned To: Bela Ban Priority: Minor Fix For: 2.5 In NAKACK, when a thread places a message for sender S into the NakReceiverWindow NRW, it subsequently acquires a lock on NRW (lock by sender) and removes as many messages as possible and passes them up. If many threads do this at the same time, all threads but one are blocked, and - when finally unblocked - usually return. This causes context switches and possibly cache flushing, so a better way would be to have the threads check whether another thread is already removing messages using a CAS operation *before* acquiring the lock. The effect should be that no threads will wait on the lock unnecessarily, and thus fewer context switches, and more threads available to the pool.