[zeromq-dev] Erlang Ports and zmq_poll

[Serge Aleynikov]

I am patiently waiting.  ;-)

BTW, if you want to flesh out some details of that migration with the 
list I'm sure many of us will be able to provide some useful feedback.

Serge

On 7/25/2010 3:59 AM, Martin Sustrik wrote:
> Hi Serge,
>
>> While applying Chris's patch based on github.com/sustrik/zeromq2 to
>> erlzmq I noticed that zmq_term() call blocks the thread running Erlang
>> VM.  I saw on this mailing list someone else sending a patch for this
>> issue and that the patch was applied:
>> http://github.com/sustrik/zeromq2/commit/11891ddd5577321a351a1850d28478e97f4b9162
>>
>> but it doesn't seem to solve this particular problem.
>>
>> I haven't spent to much time to trace the issue in zmq code base beyond
>> the fact that I see the execution point is spinning inside
>>
>> zmq::ctx_t::~ctx_t () {
>>      ...
>>      while (!zombies.empty()) {
>>           dezombity();
>>      }
>>      ...
>> }
>>
>> and I also see that while the value of ctx_t::terminated is true, inside
>> dezombify() sockets in the zombies list have terminated value equal to
>> false.
>>
>> It seems to me that inside zmq::ctx_t::dezombify() the zomby's
>> terminated flag should respect the value of ctx_t::terminated, and
>> zmq::socket_base_t::dezombify() should return true in that case (which
>> is currently ignored when calling process_commands(false, false) inside
>> that function.
>>
>> It looks like a bug to me, though I don't know implications of this
>> change on other termination scenarios.  If the description above is not
>> clear, I can submit a patch.
>
> It a bug, but the real cause is much more complex. Actually, shutdown is
> the most complex subsystem of 0MQ so if you want to tackle with it be
> prepared to spend a lot of time and brain-twisting on it.
>
> In any case, finishing "0mq socket migration" work is my top priority
> atm, so it will be hopefully fixed soon.
>
> Martin
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