Re: [jboss-dev] Change in locking behavior in MainDeployer [WAS: Port conflict in tx manager - cluster-udp-SYNC-0

On Thu, 2009-02-19 at 16:17 -0600, Brian Stansberry wrote: > 1) Is the reason you changed MainDeployerImpl.process() from a shared > lock (lockRead() call) to an exclusive lock (lockWrite() call) because > only a single thread at a time can be allowed to call > deployers.process()? If so we're stuck. On the contrary, the read/write lock semantics are supposed to be: 1) a read lock is used throughout to allow multi-threaded access unless somebody owns a write lock 2) the write lock is used at shutdown to stop any other calls from entering during the shutdown process and shutdown does not occur until other threads have exited the deployers. NOTE: before shutdown() enters the write lock it sets the deployers into a special mode where the process() calls on other threads will exit the next time it hits the check in the relevant loops.