Re: Yet another _ATL_FREE_THREADED question

"Alexander Nickolov" <>
Wed, 14 Jun 2006 15:14:37 -0700
I think you have. Now for the million dollar question - what
improvement did you expect that you are not observing? If
you synchronize all method calls on a single mutex upon entry,
your server will not behave any faster than a single-threaded

Alexander Nickolov
Microsoft MVP [VC], MCSD

"Dilip" <> wrote in message

Igor Tandetnik wrote:

Dilip <> wrote:

Igor Tandetnik wrote:

Dilip <> wrote:

I have a NT service that hosts a bunch of COM objects. I am in an
unenviable position of making it into a free threaded server.

Is there anything else I am missing?

Make sure you are calling CoIinitializeEx(COINIT_MULTITHREADED), and
not CoInitialize or CoIinitializeEx(COINIT_APARTMENTTHREADED)

You mean the __clients__ of the COM objects hosted inside the service?

No, the service itself.

OK -- I am using VS 2005 and I can see the thread being made to enter
MTA if _ATL_FREE_THREADED is defined. Maybe I am hallucinating -- I
will recheck anyway.

Also, since I am dealing with ATL wizard generated code, I assume when
_ATL_FREE_THREADED is defined the class objects are created by
automatically making the main thread enter a MTA?

At least in VC6, wizard-generated code generated an unconditional
CoInitialize() call, along with a comment saying that you need to
manually change it if you want to build free-threaded.

Ok -- this is definitely not the case with VC8.

So.. I have covered all bases then?

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