From: Martin Ceronio <martin.ceronio@...>
Date: 2009-02-26T19:50:46+09:00
Subject: Re: Thread IO

Martin Ceronio wrote:
> What can I use as a general purpose duplexed IO object to communicate
> via data streams between two threads? I would like something similar to
> TCPSocket, but without the need to communicate via a network port.

I've thought of creating two pipes (because I understand by nature that 
one end is read-only and the other write-only) and then giving each 
thread a read end and a write end, as shown below. The problem is that 
this hangs indefinitely, perhaps just highlighting my lack of 
understanding of how IO works (if that is the case, please be so kind as 
to put me out of my misery and point me to a good primer).

So, here goes:

gui_rd, ctr_wr = IO.pipe
ctr_rd, gui_wr = IO.pipe

gui = Thread.new(gui_rd, gui_wr) {|gui_rd, gui_wr|
  gui_wr << "I've got something for you\n"
  puts gui_rd.gets
}

ctr = Thread.new(ctr_rd, ctr_wr) {|ctr_rd, ctr_wr|
  puts ctr_rd.gets
  ctr_wr << "Right back at you\n"
}

gui.join
ctr.join
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