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11302334
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2012-07-02T23:04:09.153
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2012-07-02T23:04:09.153
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First of all, the state you describe with <code>READY TO RUN</code> is actually <a href="http://docs.oracle.com/javase/1.5.0/docs/api/java/lang/Thread.State.html#RUNNABLE" rel="noreferrer">RUNNABLE</a>. For my bachelor thesis I had created a transition graph showing the different thread states and when they ought to change. You haven't described the semantics of <code>getIn()</code>, so I guess it is just a random method. If the thread is executing code, for instance on of your methods <code>getIn()</code> or <code>getOut()</code> it is <code>RUNNABLE</code> and not <code>WAITING</code>. <code>BLOCKED</code> is actually only a very short transition state, which is always entered when a thread tries to claim a lock. If the lock is not available the thread keeps being blocked and cannot execute another action as you imply in step 6. Also it cannot invoke a method after calling <code>Thread.sleep()</code> it has to wait, until the time is elapsed. I would correct it the following way: <ol> <li><code>RUNNABLE</code></li> <li><code>TIMED WAITING</code></li> <li><code>RUNNABLE</code></li> <li><code>BLOCKED</code></li> <li><code>TIMED WAITING</code></li> <li><code>BLOCKED</code></li> <li><code>RUNNABLE</code></li> <li><code>TERMINATED</code></li> </ol> <img src="https://i.stack.imgur.com/n2U3N.png" alt="Thread State Transitions"> Disclaimer: There is no guarantee for the transitions. It might even be, that a JVM vendor decides to implement the underlying mechanics in another way, for instance it could implementing blocking by spin-waiting. If you want to dive deeper into this topic use a Profiler to find out the states of your thread. I have written one of my own to detect those states: <a href="https://github.com/platzhirsch/java-concurrency-profiler" rel="noreferrer">Java Concurrency Profiler</a>, but there are others out there as well, for instance VisualVM or YourKit.
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1. USKonrad Reiche
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