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Re: mmap not share
- To: <dfreyer at telecmon dot insa-lyon dot fr>,"Brian Michael Genisio" <genisiob at pilot dot msu dot edu>
- Subject: Re: mmap not share
- From: "Robert Collins" <robert dot collins at itdomain dot com dot au>
- Date: Tue, 26 Jun 2001 09:49:52 +1000
- Cc: <cygwin at sources dot redhat dot com>
- References: <200106251947.f5PJl3j26688@pilot24.cl.msu.edu>
----- Original Message -----
From: "Brian Michael Genisio" <genisiob@pilot.msu.edu>
To: <dfreyer@telecmon.insa-lyon.fr>
Cc: <cygwin@sources.redhat.com>
Sent: Tuesday, June 26, 2001 5:47 AM
Subject: Re: mmap not share
>
> Dirk,
> This mmap thing is annoying... not only because mmap does not sync
correctly,
> but because the cygipc shared memory interface uses mmap to do it's
> dirtywork... so mmaped files AND shm do not work correctly!!!!
>
> This racked my brain for a long while, until I created a workaround...
If I
> wanted to re-read the mmapped file, I had to unmap, and re-map... I
created a
> function I called mmap_sync (instead of calling msync, which does not
work
> either) and I put the unmap and map again in it... It created a lot of
needless
> overhead, but it was all I could think of to work around it...
>
> I hope I was of some help, and please tell me if you figure it out.
> Brian
>
Brian, have you considered fixing this in cygwin1.dll, not in cygipc?
That way your workaround would allow everyone access. (I suspect your
workaround isn't the appropriate fix, but nevertheless)..
Rob
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