Github user ok2c commented on the pull request:

    https://github.com/apache/httpcore/pull/7#issuecomment-62690756
  
    Hi Dmitry
    I understand the rationale behind these changes but do they really result 
in a tangible performance improvement? You see, generally IOSession should 
mostly be interacted with by one IO dispatch thread and therefore there should 
almost no thread contention to start with (besides IO interest operations). 
    
    I also would replace this bit in #close() method with 
AtomicInteger#compareAndSet
    
    ```java
    synchronized (this) {
        if (this.status == CLOSED) {
            return;
        }
        this.status = CLOSED;
    }
    ```
    Oleg  


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