[Win32utils-devel] Need some help with latest win32-mmap
johan.nilsson at esrange.ssc.se
Wed Oct 11 03:13:03 EDT 2006
> -----Original Message-----
> From: win32utils-devel-bounces at rubyforge.org
> [mailto:win32utils-devel-bounces at rubyforge.org] On Behalf Of
> Berger, Daniel
> Sent: den 10 oktober 2006 15:43
> To: Development and ideas for win32utils projects
> Subject: Re: [Win32utils-devel] Need some help with latest win32-mmap
> > -----Original Message-----
> > From: win32utils-devel-bounces at rubyforge.org
> > [mailto:win32utils-devel-bounces at rubyforge.org] On Behalf Of Johan
> > Nilsson
> > Sent: Tuesday, October 10, 2006 12:51 AM
> > To: Development and ideas for win32utils projects
> > Subject: Re: [Win32utils-devel] Need some help with latest
> > I haven't checked the implementation and this is probably
> too obvious
> > to be the culprit, but:
> > If map1.rb runs to completion and closes the mmap before
> map2.rb can
> > attach by opening it, the memory map won't exist unless you
> are using
> > something else than the paging file as backing storage. The Win32
> > mmaps are reference counted through their handles as pretty much
> > everything else.
> > Also, as you can see it that using MMap.new from map2.rb
> works as the
> > first step, but as this only creates a new identically named mmap
> > there is no 'test' data there. Hence the 'boom' I'd guess.
> > HTH,
> > Johan Nilsson
> Yes, you and Heesob are both right. I was thinking the value
> stayed resident. Once I stuck a sleep call in there and ran
> it from a second terminal it worked fine. Duh.
> In other news, it looks like I need to set a default size for
> What sounds reasonabl? 1k?
I haven't tried this myself, and judging from the MSDN docs it's also
not entirely clear that it will work, but: Try using zero(0) as the size
when calling MapViewOfFile, and then use VirtualQuery to retrieve the
size of the view.
If you want to persist the values, use a file as the backing store
(could be an optional feature, e.g. :name => '/path/to/filename' ).
Oh, and use the "Global\" prefix for map names if you intend to share
the data between different terminal server sessions (Win2k and upwards).
But I guess you already do that internally.
Regards / Johan
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