input delay issues

[Thomas Wolff]

Christopher Faylor wrote:
> On Tue, Apr 03, 2012 at 09:31:40PM +0200, Thomas Wolff wrote:
> >Am 02.04.2012 22:56, schrieb Christopher Faylor:
> >>On Mon, Apr 02, 2012 at 09:46:51PM +0200, Thomas Wolff wrote:
> >>>When input is typed-ahead, on a Unix or Linux systems it will be
> >>>buffered and used as soon as an application looks for it.  Try this: -
> >>>Run a slow command (e.g.  sleep 5) - Type "abc" while running On 
> Linux,
> >>>"abc" will be echoed on the screen (disturbing output if there is 
> any).
> >>>After the command terminates, the shell will look for input, find 
> "abc"
> >>>and redisplay it properly on the command line.
> >>>
> >>>In the cygwin console, "abc" remains invisible while the command is
> >>>running, but it is redisplayed afterwards.  In mintty, "abc" is echoed
> >>>while typed-ahead, but is *not* read and echoed by the shell after the
> >>>command terminates.  Only after you then type another character, the
> >>>whole command line is refreshed.
> >>
> >>Yes.  The console is a windows device and that's the way that Windows
> >>works.  Doing it anyway else would mean keeping a separate thread in
> >>Cygwin and essentially adding back CYGWIN=tty, which we're obviously
> >>not going to do.
> >
> >OK, so there is a clear background explaining the console behavior;
> >however, I described it only for completeness and to compare, the
> >actual problem is with mintty/xterm/urxvt: Input which is available is
> >not being detected - this is likely to be a problem with select() or
> >O_NONBLOCKed read() (whichever bash uses) or both.
>
> You have asserted this several times but I don't believe you've 
> provided a test case.
I described:
- in mintty:
- start sleep 3
- quickly enter "abc"
- wait until sleep terminates
- look at prompt
- type "d"
Isn't that a test case?
I understand an automatic test case, preferably a few lines of C code, 
may be easier to handle and analyze; maybe I'll find one. Meanwhile, 
this "manual test case" stays available.
------
Thomas

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