Re: sit-for

[David Kastrup <dak@gnu.org>]

storm@cua.dk (Kim F. Storm) writes:

> Chong Yidong <cyd@stupidchicken.com> writes:
>
>>> Since we have the new sit-for implementation, I have a lot of times
>>> when Emacs just pauses in busy waiting for input.  This happens
>>> spontaneously.  One situation where it happens frequently is when
>>> reading news with gnus.
>>
>> Another possibility just occurred to me.  Unlike the old sit-for, the
>> new sit-for is not interrupted by input coming from processes (as
>> opposed to user input).  If gnus (or some other package) relies on
>> this behavior, a bug will arise.
>
> IMO, sit-for should never be interrupted by input coming from a
> subprocess (that is what accept-process-output is for), and code
> which relies on that behaviour is wrong.

accept-process-output does not redraw the screen, so it can't do that.

> Process output is _not_ input in the normal sense.  AFAICS, process
> output is still read during sit-for and passed to the proper filters
> or buffers--so the new sit-for is doing TRT.

_If_ it indeed processes the input.

-- 
David Kastrup, Kriemhildstr. 15, 44793 Bochum