code: private void releaseCloseLock()
     {
        if (TraceComponent.isAnyTracingEnabled() && tc.isEntryEnabled()) SibTr.entry(this, tc, "releaseCloseLock");
        closeLock.readLock().unlock();
        if (TraceComponent.isAnyTracingEnabled() && tc.isEntryEnabled()) SibTr.exit(this, tc, "releaseCloseLock");
     }
docs: Release a "reader" lock on the close synchronization primative.