[zeromq-dev] Warning about attached and detached threads in czmq

[Pieter Hintjens]

I'll add this clarification (about not sharing zctx structures) to the
doc, it's worth making.

-Pieter

On Mon, Dec 31, 2012 at 12:42 PM, Andy Ballingall TF
<ballingall at thefoundry.co.uk> wrote:
> For anyone who might have wandered into the same problem I had, the czmq
> documentation is clear:
>
> https://github.com/zeromq/czmq
>
> "If you want to connect sockets over inproc:// they must share the same ØMQ
> context, i.e. be attached threads."
>
> It isn't good enough to create detached threads and have them share the same
> czmq context. A zeromq context is not a czmq context. The czmq context
> contains extra information (e.g. a list of sockets) which must only be
> manipulated by the thread it belongs to.
>
> Although attached threads share the same underlying zeromq context, if you
> share the same czmq context explicitly (as I did), then you'll run into
> problems. Only by using zthread_fork() does czmq correctly duplicate the
> czmq context to ensure thread safety.
>
> Hope this helps someone,
>
> Andy
>
>
> --
> Andy Ballingall
> Senior Software Engineer
>
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