I've just woken up and this is off the top of my head, untried, but how about something like this: | lass Valve | { | private int count; | private boolean locked; | | public synchronized void enter() | { | while (locked) | { | wait(); | } | count++; | } | | public synchronized void exit() | { | count--; | | notifyAll(); | } | | public synchronized void lock() | { | if (locked) return; | | locked = true; | | do | { | while (count > 0) | { | wait(); | } | } | } | | public synchronized void unlock() | { | if (!locked) return; | | locked = false; | | notifyAll(); | } | } | View the original post : http://www.jboss.com/index.html?module=bb&op=viewtopic&p=4021915#... Reply to the post : http://www.jboss.com/index.html?module=bb&op=posting&mode=reply&a...