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1fde952c1d
* Added Lock()/Unlock() for explicit locking by a service user. * Added NotifyLocked() and made Notify() inline. * Added HasListeners() so one can check whether there is a listener at all before preparing the event message. git-svn-id: file:///srv/svn/repos/haiku/haiku/trunk@34736 a95241bf-73f2-0310-859d-f6bbb57e9c96