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Re: usage of vyukov's mpsc queue

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Ephi Sinowitz wrote:
> 
> Hi,
> I implemented the queue http://www.1024cores.net/home/lock-free-algorithms/queues/intrusive-m...
> with a signaling mechanism for the consumer.
> Do I need to ensure visibility somehow before setting the event since
> I'm not spinning in the consumer? How?
> Producers:
> ----------------
>     vyukov_queue.push(item);
>     SetEvent(m_queueEvent);
> Consumer:
> ---------------
>     for(;;)
>     {
>         WaitForSingleObject(m_queueEvent, INFINITE);
>         while (void* item = vyukov_queue.pop())
>         {
>             // do work
>         }
>     }
> For reference here is the push()
> void MPSC_Queue::push(void* item)
> {
>     item->next = NULL;
>     void* old_head = InterlockedExchangePointer((void *volatile
> *)&m_head, item);
>     // BLOCK POINT
>     old_head->next = item;  // Do I need to ensure this is visible to
> the consumer thread?
> }

Yes, you need to make old_head->next = item store atomic-release store.

Consumer's m_tail->next load must be atomic-acquire load.

Producer's RMW can be totally relaxed with respect to memory barriers.

regards,
alexander.

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Thread

usage of vyukov's mpsc queue Ephi Sinowitz <esinowitz.public@gmail.com> - 2011-09-20 06:55 -0700
  Re: usage of vyukov's mpsc queue Joshua Maurice <joshuamaurice@gmail.com> - 2011-09-20 17:19 -0700
    Re: usage of vyukov's mpsc queue Ephi Sinowitz <esinowitz.public@gmail.com> - 2011-09-20 18:35 -0700
      Re: usage of vyukov's mpsc queue Ephraim Sinowitz <ephisinowitz@yahoo.com> - 2011-09-21 06:42 -0400
  Re: usage of vyukov's mpsc queue Joshua Maurice <joshuamaurice@gmail.com> - 2011-09-21 00:26 -0700
  Re: usage of vyukov's mpsc queue Alexander Terekhov <terekhov@web.de> - 2011-09-21 12:19 +0200
    Re: usage of vyukov's mpsc queue Alexander Terekhov <terekhov@web.de> - 2011-09-21 12:34 +0200
    Re: usage of vyukov's mpsc queue Ephi Sinowitz <ephisinowitz@yahoo.com> - 2011-09-21 06:58 -0400
      Re: usage of vyukov's mpsc queue Alexander Terekhov <terekhov@web.de> - 2011-09-21 14:02 +0200
        Re: usage of vyukov's mpsc queue Ephi Sinowitz <esinowitz.public@gmail.com> - 2011-09-21 06:08 -0700
          Re: usage of vyukov's mpsc queue Alexander Terekhov <terekhov@web.de> - 2011-09-21 15:18 +0200
            Re: usage of vyukov's mpsc queue Ephi Sinowitz <esinowitz.public@gmail.com> - 2011-09-21 06:56 -0700
              Re: usage of vyukov's mpsc queue Alexander Terekhov <terekhov@web.de> - 2011-09-21 17:06 +0200
                Re: usage of vyukov's mpsc queue Ephi Sinowitz <esinowitz.public@gmail.com> - 2011-09-21 09:16 -0700
                Re: usage of vyukov's mpsc queue Alexander Terekhov <terekhov@web.de> - 2011-09-21 18:20 +0200
  Re: usage of vyukov's mpsc queue Dmitriy Vyukov <dvyukov@gmail.com> - 2011-09-21 09:58 -0700
    Re: usage of vyukov's mpsc queue Alexander Terekhov <terekhov@web.de> - 2011-09-21 19:33 +0200
      Re: usage of vyukov's mpsc queue dvyukov@google.com - 2011-10-02 04:13 -0700
        Re: usage of vyukov's mpsc queue Alexander Terekhov <terekhov@web.de> - 2011-10-04 12:15 +0200
    Re: usage of vyukov's mpsc queue Ephi Sinowitz <esinowitz.public@gmail.com> - 2011-09-21 11:04 -0700
      Re: usage of vyukov's mpsc queue Ephi Sinowitz <esinowitz.public@gmail.com> - 2011-09-21 11:17 -0700
      Re: usage of vyukov's mpsc queue "Chris M. Thomasson" <cristom@charter.net> - 2011-09-24 22:44 -0700

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