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Date:	Mon, 2 Mar 2015 15:50:39 +0100
From:	Corinna Vinschen <corinna-cygwin AT cygwin DOT com>
To:	cygwin AT cygwin DOT com
Subject:	Re: Cygwin hangs up if several keys are typed during outputting a lot of texts.
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On Mar  2 15:44, Corinna Vinschen wrote:
> Hi Takashi,
>=20
> On Mar  2 20:45, Takashi Yano wrote:
> > On Sat, 28 Feb 2015 15:02:51 +0100
> > Corinna Vinschen <corinna-cygwin AT cygwin DOT com> wrote:
> >=20
> > > Hmm, I can reproduce this even with stty -echo.  The tty code is not
> >=20
> > Some shells seem to re-enable echo when it goes back into prompt.
> > Please put both 'stty' and 'yes' in one command line, separating
> > them with semi-colon.
>=20
> Uh, ok, I didn't realize that.
>=20
> > > exactly my domain, so I'm not sure at the moment where to look.  I gu=
ess
> > > the locking strategy in the tty code is not robust enough.  Did you h=
ave
> > > a look into the cygwin sources in the meantime, by any chance?
> >=20
> > To tell the truth, I have looked into the source code.
> > I guess the mechanism of blocking is as follows.
> >=20
> > 1) Buffer of named pipe gets full-filled by a lot of data written
> >   by slave side.
> > 2) WriteFile() in fhandler_pty_master::doecho(), which is called
> >   from master side by key input, is blocked because the buffer
> >   is full.
> > 3) If a handling to read from the pipe is in the same thread as
> >   key input, the thread falls into deadlock.
> >=20
> > To check buffer space before WriteFile() is one idea,
> > but it is not smart, I suppose...
>=20
> I think that's not it.  For testing I added code to convert the
> WriteFile calls in fhandler_pty_slave::write, fhandler_pty_master::doecho
> and fhandler_pty_slave::write to overlapped I/O and made sure to wait

Copy/paste didn't quite work as I expected.  Substitute one of these
fhandler_pty_slave::write with fhandler_pty_master::accept_input.

> for the result after the output mutex has been released.
>=20
> This change has no effect at all.  Looks like this needs some more
> digging.


Corinna

--=20
Corinna Vinschen                  Please, send mails regarding Cygwin to
Cygwin Maintainer                 cygwin AT cygwin DOT com
Red Hat

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