From: George Blat [georgeb@brd.com]
Sent: Wednesday, February 21, 2001 4:31 PM
To: NT Developers Interest List
Subject: [ntdev] Re: Semaphore visible from user-mode application.

ZwCreateSemaphore() is an undocumented native NT application call. It's not 
available
to a kernel mode driver.

George



At 09:22 PM 2/21/01 +0100, you wrote:
>Well, but the original poster wanted a semaphore. Create named semaphore in
>BaseNamedObjects directory using ZwCreateSemaphore() should solve the
>problem in kernel mode (and OpenSemaphore() can be used in user mode).
>
>Best regards,
>
>Michal Vodicka
>Veridicom
>(RKK - Skytale)
>[WWW: http://www.veridicom.com , http://www.skytale.com]
>
>
>
> > ----------
> > From:         Jamey Kirby[SMTP:jkirby@storagecraft.com]
> > Reply To:     NT Developers Interest List
> > Sent:         Wednesday, February 21, 2001 8:25 PM
> > To:   NT Developers Interest List
> > Subject:      [ntdev] Re: Semaphore visible from user-mode application.
> >
> > My preference is to use a named event in the BaseNamedObjects directory.
> > You
> > can create it in the driver or the UM code.
> >
> > > -----Original Message-----
> > > From: bounce-ntdev-562@lists.osr.com
> > > [mailto:bounce-ntdev-562@lists.osr.com]On Behalf Of George Blat
> > > Sent: Wednesday, February 21, 2001 10:57 AM
> > > To: NT Developers Interest List
> > > Subject: [ntdev] Re: Semaphore visible from user-mode application.
> > >
> > >
> > >
> > > Pablo:
> > >
> > > It's better to change places. You create the semaphore in your
> > application
> > > and pass the handle to your driver via an IOCTL. Once in your driver,
> > you
> > > need a pointer from the handle to allow access to the semaphore in an
> > > arbitrary context. You use ObReferenceObjectByHandle to get such
> > > a pointer.
> > > The pointer will be of type PRKSEMAPHORE.
> > >
> > > You must still be in the context of your application when you call
> > > ObReferenceObjectByHandle.
> > >
> > > When done with your pointer, call ObDereferenceObject to allow the
> > > object to be released.
> > >
> > >
> > > George
> > >
> > >
> > > ---
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> > >
> >
> >
> > ---
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> >
>
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