[zeromq-dev] [pyzmq] Cython vs CFFI backends

[gonzalo diethelm]

Yes, I agree that something as simple as a bunch of printf statements (maybe controlled by an #ifdef) could make debugging this kind of problem a lot easier. Then you could convert those into automatic sanity checks (again, maybe controlled by an #ifdef) so that 0mq has more awareness of misuse.

Perhaps you could use your recently acquired experience to contribute a first cut to this...

--
Gonzalo Diethelm
DCV Chile

From: zeromq-dev-bounces at lists.zeromq.org [mailto:zeromq-dev-bounces at lists.zeromq.org] On Behalf Of Michi Henning
Sent: Sunday, April 13, 2014 7:41 PM
To: ZeroMQ development list
Subject: Re: [zeromq-dev] [pyzmq] Cython vs CFFI backends

I just went through a similar experience. In my case, the problem was that close()
wasn't called from the same thread that created the socket.

You may find the explanations here useful:

http://zeromq.org/whitepapers:0mq-termination

Debugging these hands is a real pain. Is there anything that could be added to the Zmq API
to make this easier? For example, getting a list of unclosed sockets would be ultra-useful,
as would be warnings if a socket is closed from a thread other than the one that created it.

Cheers,

Michi.


On 14 Apr 2014, at 8:29 , Alexander S. <alexander at thequery.net<mailto:alexander at thequery.net>> wrote:


Hey all.

I am debugging a hang in my application: the ctx.linger option is set before creating any sockets, but it still hangs on ctx.term().

While scanning the pyzmq code I noticed the CFFI backend supports passing a linger parameter to the term() call whereas the Cython backend does not. This does not appear to be documented. Is there a reason for this difference? Or can I simply code up a pull request to add the linger parameter?

More generally, is PyPy the only reason one would use the CFFI backend? That is, can I compile pyzmq to use CFFI with CPython? And do we have a published list of differences/features supported by the two backends?

Lot's of questions. :) Thanks for the help!
--------------------
Alexander Sideropoulos
alexander at thequery.net<mailto:alexander at thequery.net>
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