Tried using PAIR sockets for IPC and ran into problems 
(https://github.com/WallStProg/zmqtests/tree/master/threads 
<https://github.com/WallStProg/zmqtests/tree/master/threads>, 
https://github.com/zeromq/libzmq/issues/2759 
<https://github.com/zeromq/libzmq/issues/2759> ).

They have signficant limitations in any case. 

Why not use one of the thread-safe sockets?

> On Dec 13, 2019, at 12:38 PM, Brett Viren <[email protected]> wrote:
> 
> Bill Torpey <[email protected]> writes:
> 
>> - In practice, it’s possible to share PUB sockets using mutexes if you’re 
>> careful.
> 
> How about PAIR?  Can I let one end be used from multiple different
> threads if I assure all such access is protected by a mutex?
> 
> I'll add this to my test but if there is some prior experience with this
> setup, please let me know.
> 
> Thanks!
> -Brett.

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