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Date: Wed, 1 Apr 2009 11:19:28 +0530
Message-ID: <bc2e28c70903312249t63444b70la92732bb3a05afe5@mail.gmail.com>
Subject: Re: IPC,FORK on Windows 2008 Server
From: Yarlagadda Suresh <ysuresh DOT forum AT gmail DOT com>
To: cygwin AT cygwin DOT com
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Thanks a ton for your quick response.

Could please let me know the patch version number, which includes the fix?

Cheers,
Suresh Kumar.

On Tue, Mar 31, 2009 at 8:37 PM, Corinna Vinschen
<corinna-cygwin AT cygwin DOT com> wrote:
> On Mar 31 14:08, Corinna Vinschen wrote:
>> On Mar 31 17:11, Yarlagadda Suresh wrote:
>> > Hi,
>> >
>> > I am using shmget()/shmat() methods for getting the shared memory.
>> >
>> > I had tried running the same program which is given in the previous
>> > mention thread, the results are same as mentioned over there.
>>
>> I just tried that testcase with Cygwin 1.7 and it appears to work most
>> of the time. =A0 Unfortunately I can still reproduce the problem once per
>> about 30 forks.
>>
>> I'll look into fixing this for Cygwin 1.7. =A0However, please note that
>> there is no *really* foolproof method to fix this due to the way fork
>> has to be implemented using Win32 calls. =A0I can only make it much more
>> unlikely than today.
>
> I applied a patch to Cygwin which allocates the shmat() shared memory
> regions top-down, same as the mmap() regions. =A0This should make the
> observed effect at fork() pretty unlikely. =A0The patch will be in the
> next Cygwin 1.7.0 test release (in a couple of days).
>
>
> Thanks for the report,
> Corinna
>
> --
> Corinna Vinschen =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0Please, send mails re=
garding Cygwin to
> Cygwin Project Co-Leader =A0 =A0 =A0 =A0 =A0cygwin AT cygwin DOT com
> Red Hat
>
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