Re: multi-process singleton DLL

"Ben Voigt [C++ MVP]" <rbv@nospam.nospam>
Tue, 24 Jul 2007 08:52:55 -0500
"Brian Muth" <> wrote in message

The problem of trying to come up with a "singleton" DLL is that you have
no control over the
lifetime of the DLL itself. It can unload at any time without warning (for
example, when
the client exits unexpectedly).

To gain lifetime control, you really need to have a service that handles
the common
resources on behalf of the client, and this is the approach that Ben is

(I'm not exactly certain what you are trying to gain by creating a
singleton in the first
place. If all you are trying to do is help the developer with some of the
esoteric IOCTL_ calls, perhaps you can simply provide a DLL that provides
that functionality. Typically

Apparently that's what the OP has done, but is hitting sharing violation on
the second connection. Perhaps it's just a matter of setting the right
FILE_SHARE_* flags in the CreateFile call.

each client should be able to open their own connection to an NDIS driver,
if the driver
has been written for XP.)



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