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Re: IPC,FORK on Windows 2008 Server
- From: Yarlagadda Suresh <ysuresh dot forum at gmail dot com>
- To: cygwin at cygwin dot com
- Date: Wed, 1 Apr 2009 11:19:28 +0530
- Subject: Re: IPC,FORK on Windows 2008 Server
- References: <bc2e28c70903310234p1fa23e9esfe4e4ca8f293fbef@mail.gmail.com> <20090331112111.GB12738@calimero.vinschen.de> <bc2e28c70903310441h7f354e5br99ecf91825231227@mail.gmail.com> <20090331120843.GD12738@calimero.vinschen.de> <20090331150728.GE12738@calimero.vinschen.de>
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@cygwin.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. ? Unfortunately I can still reproduce the problem once per
>> about 30 forks.
>>
>> I'll look into fixing this for Cygwin 1.7. ?However, please note that
>> there is no *really* foolproof method to fix this due to the way fork
>> has to be implemented using Win32 calls. ?I 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. ?This should make the
> observed effect at fork() pretty unlikely. ?The patch will be in the
> next Cygwin 1.7.0 test release (in a couple of days).
>
>
> Thanks for the report,
> Corinna
>
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> Corinna Vinschen ? ? ? ? ? ? ? ? ?Please, send mails regarding Cygwin to
> Cygwin Project Co-Leader ? ? ? ? ?cygwin AT cygwin DOT com
> Red Hat
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