Exchange that is always halted
Provides loopBack exchange, that loops data written to it back to read side, via supplied Process1.
Provides loopBack exchange, that loops data written to it back to read side, via supplied Process1.
If process1 starts with emitting some data, they are read first.
This exchange will terminate read side once the p terminates.
Note that the write side is run off the thread that actually writes the messages, forcing the read side
to be run on different thread.
This primitive may be used also for asynchronous processing that needs to be forked to different thread.
Process to consult when looping data through