[zeromq-dev] Want to use ZMQ socket in multithreading

Auer, Jens jens.auer at cgi.com
Fri Jul 29 10:47:19 CEST 2016


Hi Bharat,

ZeroMQ is not rhead-safe and sockets shall not be used concurrently from different threads. I think there are some new socket types in the master branch which are thread-safe, but this not part of the release version. As they are not thread-safe, you cannot reliably check conditions on them when using them concurrently. You could use a mutex to prevent concurrent access.

The recommended alternative would be to have independent theads that do not share data or resources communicating via ZMQ_PAIR sockets. I would strongly recommend to go that route as data-sharing multi-threading is a highway to hell. It does also often not offer the performance/scalability gain that you are hoping for because of congestion at the shared resources.

Cheers,
  Jens

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________________________________
Von: zeromq-dev [zeromq-dev-bounces at lists.zeromq.org]" im Auftrag von "Bharat Somani [bharatdsomani at gmail.com]
Gesendet: Freitag, 29. Juli 2016 09:09
An: ZeroMQ development list
Betreff: [zeromq-dev] Want to use ZMQ socket in multithreading

Hi All,

I am creating socket in one thread and sharing this to be used in multiple threads. But when I try to use it, sometimes I get error

Assertion failed: check () (src/msg.cpp:248)

I was breaking ZMQ's rule of sharing sockets among threads.

Is there any way to know whether the socket is currently in used (sending data) state? If there is a way, I can check it before sending the data.


Regards,
Bharat
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