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Re: buffering of process output

From: Kim F. Storm
Subject: Re: buffering of process output
Date: Mon, 11 Oct 2004 10:37:11 +0200
User-agent: Gnus/5.11 (Gnus v5.11) Emacs/21.3.50 (gnu/linux)

address@hidden (Kim F. Storm) writes:

> Andreas Schwab <address@hidden> writes:
>> address@hidden (Kim F. Storm) writes:
>> It doesn't.  It's because there is no call to XFlush during the read loop
>> in call-process.  See the comment in xterm.c:
>> /* Remove calls to XFlush by defining XFlush to an empty replacement.
>>    Calls to XFlush should be unnecessary because the X output buffer
>>    is flushed automatically as needed by calls to XPending,
>>    XNextEvent, or XWindowEvent according to the XFlush man page.
>>    XTread_socket calls XPending.  Removing XFlush improves
>>    performance.  */
>> Thus redisplay_preserve_echo_area does not call XFlush any more.
>> Andreas.
> Thanks for the explanation.  I'll fix that.

An explicit flush doesn't fix the problem -- it may have some effect,
but output is still buffered (at least) two lines per update.

I still see cases where the display is not really updated at all
(as if redisplay doesn't see that the display need update).

I'll keep investigating.

Kim F. Storm <address@hidden> http://www.cua.dk

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