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Re^2: Boolean Thread::Semaphore ?

by chrestomanci (Priest)
on Feb 08, 2012 at 16:10 UTC ( #952525=note: print w/ replies, xml ) Need Help??


in reply to Re: Boolean Thread::Semaphore ?
in thread Boolean Thread::Semaphore ?

You don't want a semaphore.

The simplest mechanism is:

while( my $workitem = sourceOfWork() ) { sleep 1 while $Q->pending > MAXQ; $Q->enqueue( $workitem ); }

Thanks, that looks to be a much more sensible approach compared with what I was doing with semaphores.

That should teach me to read algorithoms online that are intened for other languages or problem domains where near realtime responses are required.


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Re^3: Boolean Thread::Semaphore ?
by mellon85 (Monk) on Feb 08, 2012 at 17:28 UTC

    The best way (aka not polling) would be that the worker thread will stop itself if the queue is full, and will be restarted by a client thread by a signal.

    take a look at thread signalling chapter in threads documentation

      take a look at thread signalling chapter in threads documentation

      That is a truly awful idea.

      Try it for yourself to find out why.


      With the rise and rise of 'Social' network sites: 'Computers are making people easier to use everyday'
      Examine what is said, not who speaks -- Silence betokens consent -- Love the truth but pardon error.
      "Science is about questioning the status quo. Questioning authority".
      In the absence of evidence, opinion is indistinguishable from prejudice.

      The start of some sanity?

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