This is not accurate. The STA does not provide synchronization in the
case where the component makes an outgoing call. Other calls on the
component are accepted and processed during the outgoing call. If you
want synchronization, you need to implement it with message filters (or
use COM+).

-----Original Message-----
From: Tahsin Alam [mailto:tahsinalamYAHOO.COM]
Sent: Monday, June 25, 2001 7:31 AM
To: DCOMDISCUSS.MICROSOFT.COM
Subject: Re: Single threaded DCOM server acting Multi-Threaded while
waiting for callbacks to complete!

From my reading of Essential COM, my understanding is
that when an STA object makes an outgoing call and
waits on it, its thread does return to the pool.
However, it will only accept a callback bearing the
same "activity id". So, if another client calls the
STA object, that client will block. But if the object
that the STA object called makes a return callback, it
will be allowed in.

This keeps the semantics of STA synchronization
requirement while preventing deadlock situation from
arising with callbacks to the STA object.

tahsin

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