/dev/windows and select() [was Re: Slow response to keypresses in xorg-server-1.8.0-1]

Corinna Vinschen corinna-cygwin@cygwin.com
Mon Aug 30 18:05:00 GMT 2010

On Aug 30 12:49, Brian Ford wrote:
> On Mon, 30 Aug 2010, Corinna Vinschen wrote:
> > I applied a patch to Cygwin which should make select on /dev/windows
> > fully functional.
> >
> > The blessed solution is to replace the call to MsgWaitForMultipleObjects
> > with a call to MsgWaitForMultipleObjectsEx with the MWMO_INPUTAVAILABLE
> > flag set.  This flag is defined to do exactly what we need.
> Just wondering, does this also effect select/poll on sockets in either 1.7
> or 1.5?

Not at all.  It only affects select on /dev/windows.

> A long time ago (1.5.18) I discovered a delay in select on sockets
> wondered if this might have been related.

The implementation of the socket-specific code in the select function
has been rewritten from sratch for 1.7.


Corinna Vinschen                  Please, send mails regarding Cygwin to
Cygwin Project Co-Leader          cygwin AT cygwin DOT com
Red Hat

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