[slime-devel] Need automatric force-output for slime-repl

[Helmut Eller]

Lynn Quam <quam at ai.sri.com> writes:

> Is it possible to cause force-output to automatically occur on the
> repl-buffer.  It is annoying that various debugging printout must be
> explicitly followed by a force-output in order for it to appear in a
> timely fashion.

Not easily.  

You could disable buffering altogether with something like:

  (setf (lisp::fd-stream-buffering *standard-output*) :none)

or in your ~/.swank.lisp:

  (swank::add-hook swank::*new-connection-hook*
		   (lambda (c) (setf (lisp::fd-stream-buffering
				      (swank::connection.dedicated-output c))
				     :none)))

If CMUCL were interrupt-safe or if it had preemptive threads you could
install a timer which periodically flushes the standard streams.  But,
ala, it isn't, so the timer variant is rather dangerous.

Helmut.