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    <p>From your comments:</p> <blockquote> <p>i need to know that if pool is idle or pool can accept the tasks. if pool can accept, i need to know how much free threads in the pool. if it is 5 i will send 5 tasks to the pool to do the processing.</p> </blockquote> <p>I don't think that you should be doing the pool accounting yourself. For your thread pool if you use <code>Executors.newFixedThreadPool(5)</code> then you can submit as many tasks as you want and it will only run them in 5 threads.</p> <blockquote> <p>so i get the first most 5 tasks from the vector and assign them to the pool.ignore the other tasks in the vector since they may be update / remove from a separate cycle</p> </blockquote> <p>Ok, I see. So you want to maximize parallelization while at the same time not pre-loading jobs? I would think that something like the following pseudo code would work:</p> <pre><code> int numThreads = 5; ExecutorService threadPool = Executors.newFixedThreadPool(numThreads); List&lt;Future&lt;MyJob&gt;&gt; futures = new ArrayList&lt;Future&lt;MyJob&gt;&gt;(); // submit the initial jobs for (int i = 0; i &lt; numThreads; i++) { MyJob myJob = getNextBestJob(); futures.add(threadPool.submit(myJob, myJob)); } // the list is growing so we use for i for (int i = 0; i &lt; futures.size(); i++) { // wait for a job to finish MyJob myJob = futures.get(i); // process the job somehow // get the next best job now that the previous one finished MyJob nextJob = getNextBestJob(); if (nextJob != null) { // submit the next job unless we are done futures.add(threadPool.submit(myJob, myJob)); } } </code></pre> <p>However, I don't quite understand how the thread count would change however. If you edit your question with some more details I can tweak my response.</p>
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    1. POThreadPoolExecutor Utility methods
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    1. COhi @gray - thanks a lot for ur answer. i just looked in to the `QueuedThreadPool' and there is a method called `getIdleThreads()` i am looking for that and i dnt have a proper idea of the consequences. thanks for your turn over..
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    2. COi have tried your algorithm and it seems like it will lead to a deadlock situation. i will post the java code that i used to implement it.
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