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PO
 

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    <p>You could try connecting the thread groups with an <a href="http://download.oracle.com/javase/6/docs/api/java/util/concurrent/Exchanger.html" rel="nofollow">Exchanger</a>. It's classically used for transferring work back and forth between two threads that alternate work. Seems like you might be able to make it work for groups of threads too if you can get the transfer to work right. </p> <p>What if you had a controller thread for each group? You could then have the controller notifyAll on his group when he received an item in the Exchanger, then join on all of his own group. When the joins all return, he could transfer control back over the Exchanger.</p> <p>Or if the number of threads in each group is fixed, you could create a <a href="http://download.oracle.com/javase/6/docs/api/java/util/concurrent/CyclicBarrier.html" rel="nofollow">CyclicBarrier</a> for the group with the fixed number of threads, then specify a barrier action to be run when all of the threads complete and hit the barrier. That action could transfer control via an Exchanger or a <a href="http://download.oracle.com/javase/6/docs/api/java/util/concurrent/SynchronousQueue.html" rel="nofollow">SynchronousQueue</a> (which is a 0-length queue that enforces synchronous coordination).</p> <p>For more information on synchronizers, check out <a href="http://javaconcurrencyinpractice.com" rel="nofollow">Java Concurrency in Practice</a> or the <a href="http://refcardz.dzone.com/refcardz/core-java-concurrency" rel="nofollow">DZone concurrency refcard</a>. </p>
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    1. POHow can I wait() on one object and then notifyAll on another?
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    1. USAlex Miller
    1. USAlex Miller
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    1. POHow can I wait() on one object and then notifyAll on another?
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    1. COthis looks really interesting - I'll need to read up before replying
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      1. USHamy
    2. COOne significant downside of the join() solution is that you have to repeatedly re-launch the threads which I suspect is very expensive compared to synchronizers like Exchange or CyclicBarrier.
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      1. USAlex Miller
    3. CO+1 on the CyclicBarrier, quite handy for this kind of thing.
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      1. USJed Wesley-Smith
 

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