Github user clebertsuconic commented on a diff in the pull request:
    --- Diff: 
    @@ -0,0 +1,182 @@
    + * Licensed to the Apache Software Foundation (ASF) under one or more
    + * contributor license agreements. See the NOTICE file distributed with
    + * this work for additional information regarding copyright ownership.
    + * The ASF licenses this file to You under the Apache License, Version 2.0
    + * (the "License"); you may not use this file except in compliance with
    + * the License. You may obtain a copy of the License at
    + *
    + *
    + *
    + * Unless required by applicable law or agreed to in writing, software
    + * distributed under the License is distributed on an "AS IS" BASIS,
    + * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
    + * See the License for the specific language governing permissions and
    + * limitations under the License.
    + */
    +package org.apache.activemq.artemis.utils.critical;
    +import java.util.ConcurrentModificationException;
    +import java.util.concurrent.CopyOnWriteArrayList;
    +import java.util.concurrent.Semaphore;
    +import java.util.concurrent.TimeUnit;
    +import org.apache.activemq.artemis.utils.collections.ConcurrentHashSet;
    +import org.jboss.logging.Logger;
    +public class CriticalAnalyzerImpl implements CriticalAnalyzer {
    +   private final Logger logger = Logger.getLogger(CriticalAnalyzer.class);
    +   private volatile long timeout;
    --- End diff --
    I don't need it to be atomic really. as soon as the dead lock stops 
updating this.. it would be enough to me to just have a volatile here.
    The only overhead is the call to System.currentTimeMillis(); I did some 
tests and didn't see any regressions.

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