@Override
    public void releaseReader() {
        readerLock.unlock();
    }
Relinquishes exclusive read access to the Guacamole instruction
stream. This function should be called whenever a thread finishes using
a GuacamoleTunnel's GuacamoleReader.
guacamole-common/src/main/java/org/apache/guacamole/net/AbstractGuacamoleTunnel.java