1.7.0 CVS mmap failure

Corinna Vinschen corinna-cygwin@cygwin.com
Fri Jan 5 19:23:00 GMT 2007

On Jan  5 12:42, Brian Ford wrote:
> On Fri, 5 Jan 2007, Corinna Vinschen wrote:
> So, it does indeed look taken.

Too bad.

> > Actually this shows a problem in the mmap implementation with respect to
> > MEM_TOP_DOWN.  I think, what mmap should actually do is to create a
> > lightweight MAP_RESERVE anonymous mapping of the whole requested mapping
> > size, then close it again and then reopen it with the address it got
> > in this first try.  This would probably ensure that the subsequent two
> > mapping will work.
> I don't know what mmap magic Cygwin uses internally to do this, but can't
> you just map the big region, then overmap the disk file without the map,
> unmap, remap, remap?

"overmap"?  -v please?


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

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