Re: How does COM pick a thread to create object in?

"Igor Tandetnik" <>
Tue, 25 Sep 2007 15:59:22 -0400
Scott McPhillips [MVP] <org-dot-mvps-at-scottmcp> wrote:

"Igor Tandetnik" <> wrote in message

Scott McPhillips [MVP] <org-dot-mvps-at-scottmcp> wrote:

I would like to create a bunch of identical objects in my server
from my client, with each one in a thread of its own.


Using STA,
obviously COM picks a thread somehow, but what determines which
thread it picks?

Are we talking about in-proc or out-of-proc server? See also

This is for an out-of-proc server.

Your server calls CoRegisterClassObject on a particular thread, to
register its class factory. When the client creates the object, COM is
going to call IClassFactory::CreateInstance on this same thread.
Normally, the class factory would just create a new instance on the same
thread again, but of course nothing prevents one from writing a class
factory that spins a new thread for each object it creates. You can
study the source code for CComClassFactoryAutoThread and related
classes - they do something similar.
With best wishes,
    Igor Tandetnik

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