about async process

[akrl <akrl@sdf.org>]

Hi all,
the question is: when is the process buffer updated after an async
process finish to execute?
This is what I'm trying to do:

(make-thread (lambda ()
	       (let ((prc
		      (start-process-shell-command "test"
						   "out-buff"
						   "echo foo")))
		 (while (not (equal (process-status prc)
				    'exit))
		   (thread-yield))
		 (with-current-buffer "out-buff"
		   (print (buffer-string))
		   (sleep-for 0.1)
		   (print (buffer-string))))))

I'm trying to execut an async process in a thread yielding till this has
finished and then reading the output.
When I execute this code the first print is printing "" and just the
second print after the sleep il latching the output I would expect.
So my question is when is the output buffer updated and if ther's a way to
ensure this has happend or to request for it?

Bests and thanks
  Andrea

-- 
akrl@sdf.org