On 03/23/2011 09:00 AM, Christopher Faylor wrote: > On Wed, Mar 23, 2011 at 11:31:46AM +0000, Jon TURNEY wrote: >> On 22/03/2011 20:08, Christopher Faylor wrote: >>> On Tue, Mar 22, 2011 at 08:53:34PM +0100, V??clav Haisman wrote: >>>> Jon TURNEY wrote, On 22.3.2011 20:29: >>>>> >>>>> python seems to be built with the default value of FD_SETSIZE, which is >>>>> only 64 on cygwin. >>>> Is this not because of the inherent limitation of >>>> WaitForMultipleObjects() call? >>> >>> Yep. Without a rewrite, it's a hard limit to Cygwin's select(). >> >> Please read my email more closely. I am not saying "python select() is >> limited to waiting on 64 fds or less", I am saying "python select() is >> limited to waiting on fd which are less than 64" > > I forgot to add one bit of data. Unless you go out of your way to > change it, Cygwin's select can't wait for an fd > 63. It's basically a > bit mask. So, there are two limitations: 1) the number of handles that > you can wait for with WaitForMultipleObjects() and 2) the size of > Cygwin's fd_set.
Which is why poll() was invented - it lets you wait on fds > 63 (however, you are still limited by WaitForMultipleObjects that nfds of poll() must be <= 63). -- Eric Blake ebl...@redhat.com +1-801-349-2682 Libvirt virtualization library http://libvirt.org
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