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Message-ID:	<033501c0fdd1$87ab0c20$0200a8c0@lifelesswks>
From:	"Robert Collins" <robert DOT collins AT itdomain DOT com DOT au>
To:	<dfreyer AT telecmon DOT insa-lyon DOT fr>,
	"Brian Michael Genisio" <genisiob AT pilot DOT msu DOT edu>
Cc:	<cygwin AT sources DOT redhat DOT com>
References:	<200106251947 DOT f5PJl3j26688 AT pilot24 DOT cl DOT msu DOT edu>
Subject:	Re: mmap not share
Date:	Tue, 26 Jun 2001 09:49:52 +1000
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----- Original Message -----
From: "Brian Michael Genisio" <genisiob AT pilot DOT msu DOT edu>
To: <dfreyer AT telecmon DOT insa-lyon DOT fr>
Cc: <cygwin AT sources DOT redhat DOT 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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