[zeromq-dev] Need CZMQ reference: Sending object pointers to threads using ZMQ_SEND over ZMQ_PAIR Socket

Shrikanth M.D. shrikanthdiwakar at gmail.com
Wed Dec 21 00:12:51 CET 2016


Hello,

Is there any comprehensive guide/tutorial/book to follow czmq?
Apparently there have been so many evolutions and it is difficult to follow.
For instance, zsocket is not available on the latest and no idea how to use
zsock classes.

Please help.

Rgerads,
Shrikanth

On Tue, Dec 20, 2016 at 2:10 PM, Luca Boccassi <luca.boccassi at gmail.com>
wrote:

> On Tue, 2016-12-20 at 13:14 +0100, Shrikanth M.D. wrote:
> > Hi,
> >
> > I have tried a small piece of code as in here:
> > http://pastebin.com/JUxXjYX2
> >
> >
> > I am using ZEROMQ 4.1.5 library and running on Ubuntu 15.04.
> > This is how I compile and execute the code:
> >  gcc zeromq_example.c -o a.out -lzmq -lpthread
> >
> >
> >
> > When I compile the example code in the link as sudo user, I am able to
> > successfully receive
> > the struct content on the thread side.
> > However, occasionally I observe ZMQ_Receive  error. Is this because I am
> > executing my program too quickly again in the second run?
> >
> > Below is the output:
> > shrikanth at mds:~$ sudo ./a.out
> > The values received are 1000 5000 100 500 HelloWorld
> > shrikanth at mds:~$ sudo ./a.out
> > Error in Receiving
> > The values received are -1052453120 32596 1 0
> > shrikanth at mds:~$ sudo ./a.out
> > The values received are 1000 5000 100 500 HelloWorld
> > shrikanth at mds:~$
> >
> >
> > Also, without sudo user, although buffer contents are received by the
> > thread, it ends up with a segmentation fault (may be because of the
> memory
> > access to struct sample within the struct example).
> >
> > Could you please suggest a workaround for this situation?
> > I do not want to serialize/de-serialize stuff between my main thread and
> > worker thread.
> >
> > Any kind of input is deeply appreciated.
> >
> > Regards,
> > Shrikanth
>
> What you are trying to do is already implemented in CZMQ, so I would
> recommend you to use that instead:
>
> https://github.com/zeromq/czmq
>
> zsock_send ("p", pointer)
> zsock_recv ("p", &pointer)
>
> Kind regards,
> Luca Boccassi
>
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>
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