Re: Loop for AfxBeginThread

From:
"Scott McPhillips [MVP]" <org-dot-mvps-at-scottmcp>
Newsgroups:
microsoft.public.vc.mfc
Date:
Wed, 06 Jun 2007 10:40:32 -0400
Message-ID:
<xcGdnQyBd-T7WvvbnZ2dnUVZ_vumnZ2d@comcast.com>
jp2code wrote:

Ok. Between the two replies, it is obvious that setting a BOOL value is the
wrong way to go.

There is only the main thread and the worker thread (2 threads).

Now the question becomes:

* Should I use a mutex or something else?

I'm leaning towards a mutex after reading many of Joseph Newcomer's essays,
but it is a lot of information on those essays, and I may have missed the
big picture.


You should use a CRITICAL_SECTION. Between threads of the same process
it provides the same functionality as a mutex but is a lot more
efficient. A mutex is required when synchronizing multiple programs, a
critical section when synchronizing multiple threads within the same
program.

You initialize the critical section, then each thread does the following:

EnterCriticalSection(&cs);
....access the shared resource
LeaveCriticalSection(&cs);

While thread A is between the calls, thread B is suspended if it calls
EnterCriticalSection. When A leaves, B resumes.
--
Scott McPhillips [MVP VC++]

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