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Re: thread pool

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On 2014-07-22 21:14:49 +0000, Eric Sosman said:

> On 7/22/2014 5:01 PM, Philipp Kraus wrote:
>> [... ugly double-spaced Googlejunk snipped ...]
>> My solution seems to be similar, but if I run your startThreads again
>> thet.start();
>> 
>> throws the InterruptedException directly, so I do
>> 
>> main()
>> {
>> Master x = new Master();
>> 
>> x.startThreads(5);
>> x.stopThreads();
>> x.startThreads(5); <= this does not work because the exception is thrown
>> }
> 
>      Are you sure startThreads() is creating and starting brand-
> new Threads each time it's called, not re-using old Threads?
> To put it another way, are you sure stopThreads() actually stops
> all the old Threads and waits for them to finish stopping (and
> then clears its "running workers" list)?

IMHO I do this (m_runners is the threadgroup):

        m_runners.interrupt();
        try {

            m_threadcounter.await();

        } catch (InterruptedException l_exception) {
            m_Logger.error(l_exception.getMessage());
        }

m_threadcounter is the CountDownLatch which is initialize on the 
startThreads with the number of threads and each thread
calls the countDown() method before the run is released

>      I cannot imagine how a newly-created Thread would find itself
> in the interrupted state before anything interrupts it.  Is there
> some other part of your program that interrupts Threads when it
> shouldn't?

I don't think so. The threads are stopped / started from the UI and I 
use some external libraries.

I have build a short example under 
https://github.com/flashpixx/threadtest which shows the problem (I use 
Java 1.8).
I get 
CSimulation@5cad8086		simulation is started with [5] threads
CWorker@18a5eea9		thread [9] starts working
CWorker@3d9bc497		thread [10] starts working
CWorker@7351b7d5		thread [11] starts working
CWorker@6605d308		thread [12] starts working
CWorker@6826907c		thread [13] starts working

CWorker@6605d308		thread [12] stops working with current count down latch [3]
CWorker@18a5eea9		thread [9] stops working with current count down latch [3]
CWorker@7351b7d5		thread [11] stops working with current count down latch [2]
CSimulation@5cad8086		threads stopped
CWorker@3d9bc497		thread [10] stops working with current count down latch [0]
CWorker@6826907c		thread [13] stops working with current count down latch [1]
CSimulation@5cad8086		simulation is stopped




CSimulation@5cad8086		simulation is started with [5] threads
CWorker@b7127ff			thread [14] starts working
CWorker@6441c612		thread [15] starts working
CWorker@67d26a8e		thread [16] starts working
CWorker@193fa958		thread [17] starts working
CWorker@3aa2722f		thread [18] starts working

CWorker@6441c612		thread [15] stops working with current count down latch [3]
CWorker@193fa958		thread [17] stops working with current count down latch [1]
CWorker@3aa2722f		thread [18] stops working with current count down latch [0]
CSimulation@5cad8086		threads stopped
CWorker@67d26a8e		thread [16] stops working with current count down latch [3]
CSimulation@5cad8086		simulation is stopped
CWorker@b7127ff			thread [14] stops working with current count down latch [0]

It seems, that the CountDownLatch does not work as expected. Any idea?

Phil

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Thread

thread pool Philipp Kraus <philipp.kraus@flashpixx.de> - 2014-07-22 15:00 +0200
  Re: thread pool Eric Sosman <esosman@comcast-dot-net.invalid> - 2014-07-22 09:11 -0400
    Re: thread pool Philipp Kraus <philipp.kraus@flashpixx.de> - 2014-07-22 16:32 +0200
    Re: thread pool Philipp Kraus <philipp.kraus@flashpixx.de> - 2014-07-22 21:38 +0200
      Re: thread pool Eric Sosman <esosman@comcast-dot-net.invalid> - 2014-07-22 16:29 -0400
        Re: thread pool Philipp Kraus <philipp.kraus@flashpixx.de> - 2014-07-22 23:01 +0200
          Re: thread pool Eric Sosman <esosman@comcast-dot-net.invalid> - 2014-07-22 17:14 -0400
            Re: thread pool Philipp Kraus <philipp.kraus@flashpixx.de> - 2014-07-23 08:11 +0200
              Re: thread pool Eric Sosman <esosman@comcast-dot-net.invalid> - 2014-07-23 07:24 -0400
                Re: thread pool Philipp Kraus <philipp.kraus@flashpixx.de> - 2014-07-23 15:57 +0200
                Re: thread pool Eric Sosman <esosman@comcast-dot-net.invalid> - 2014-07-23 11:41 -0400
                Re: thread pool Philipp Kraus <philipp.kraus@flashpixx.de> - 2014-07-24 09:55 +0200
                Re: thread pool Eric Sosman <esosman@comcast-dot-net.invalid> - 2014-07-24 08:39 -0400
  Re: thread pool Kevin McMurtrie <mcmurtrie@pixelmemory.us> - 2014-07-24 20:50 -0700

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