[Interest] Process isolation with Qt - how to communicate with child processes

[Konstantin Tokarev]

04.01.2016, 20:00, "Etienne Sandré-Chardonnal" <etienne.sandre at m4x.org>:
> Dear All,
>
> I have a server app which currently spawns threads for processing tasks from incoming connections.
>
> I need to isolate these tasks in processes instead of threads (there are several reasons for this, including the fact that tasks will run possibly bugged plugin code and this should not crash the server process).
>
> What is the best Qt way to communicate with the child processes? I have first thought using standard input/output, but it seems that it's impossible to wait for incoming data from stdin without polling. The other alternative I see is TCP Sockets, but is there an overhead? The amount of data may be quite large (a few MB/s).

Don't use TCP sockets for local communication. Use QLocalSocket (or AF_UNIX directly).

stdin does not differ much from sockets, it is in blocking mode by default (so you don't need to use polling), and can be switched to non-blocking mode.


-- 
Regards,
Konstantin