[zeromq-dev] Sharing socket safely between threads

[Attila Magyari]

This sounds promising. My concern is if there are some background threads
internally in the ZMQ library, which would use the socket out of sync with
mine, or anything else that I'm not thinking about. I can ensure that the
socket won't be used from multiple threads.

Do you have any experience with this, or only theory?

Thank you,
Attila

On Mon, May 7, 2018 at 5:49 PM Thomas Rodgers <rodgert at twrodgers.com> wrote:

> The zmq docs say you need to ensure a ‘full fence’ a mutex is one way of
> achieving that.
>
> If you are using C++ (-std=c++11 or later) and you can guarantee there is
> no racy usage from another thread, you can issue a memory fence using -
>
> std::atomic_thread_fence
>
> On Mon, May 7, 2018 at 8:42 AM Attila Magyari <atti86 at gmail.com> wrote:
>
>> Hello,
>>
>> I know that zmq sockets are not thread safe. However I can't think of a
>> good design (explained below) without using the socket in several threads.
>> What I want to do is connect the socket in a thread, and then use it in a
>> different one until the end, and never in parallel between several threads.
>> I will guard the access with a mutex as well. Do you think this will be
>> safe?
>>
>> Just in case someone might have a better idea for my design, here is what
>> I'm trying to do:
>> I have an application which starts another process, passes a port to the
>> newly created process, so it can connect back to the main application
>> through a ZMQ_PAIR socket. Both processes are local to the machine. The
>> main application will request from the second one, but the second one can
>> initiate messages without an explicit request as well. Do you have a nicer
>> design to achieve something like this?
>>
>> Thank you in advance!
>>
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