Re: Reading Serial Port

From:
"Scott McPhillips [MVP]" <org-dot-mvps-at-scottmcp>
Newsgroups:
microsoft.public.vc.mfc
Date:
Tue, 5 Feb 2008 07:18:48 -0500
Message-ID:
<#fm6JF$ZIHA.4180@TK2MSFTNGP06.phx.gbl>
"clinisbut" <clinisbut@gmail.com> wrote in message
news:e3bd3c90-b885-4c06-b526-65070a47e425@s12g2000prg.googlegroups.com...

Ok, I tried this:
I created two new events: ReaderStoped and WriterStoped.
In my reader-worker-thread:
 Once the shutdown event is signaled, the loop breaks and reaches
this line:
 SetEvent( ReaderStoped );

 Same with Writer method.

Then, in my stop() method:
  SetEvent(ShutdownEvent);
  WaitForSingleObject( ReaderStoped, INFINITE ); //Just for
testing, I know I should call WaitForMultipleObjects with the events
ReaderStoped and WriterStoped.

  CloseHandle( ShutdownEvent );
  CloseHandle( hComm );
  CloseHandle( ReadEvent );
  CloseHandle( WriteEvent );
  CloseHandle( ReaderStoped );
  CloseHandle( WriterStoped );

  PostQuitMessage( 0 );


Why did you introduce the new 'Stoped' events? You had it right in the
previous message: WaitForSingleObject should wait on the thread handle.
These new events just add complexity and needlessly duplicate built-in
functionality.

And, as explained in my previous reply, you are not calling PostQuitMessage
from the thread that is quitting.

Here is a recipe, assuming that the CWinThread m_bAutoDelete is set to FALSE
at startup.

How to shut down a worker thread:
main thread does SetEvent(ShutdownEvent)
main thread does WFSO(pthread->m_hThread)
    worker thread senses ShutdownEvent with WFSO.
    worker thread returns from thread function.
main thread WFSO returns
main thread closes handles
main thread delete pthread

How to shut down a message-driven thread:
main thread PostThreadMessage with shut down message
main thread does WFSO(pthread->m_hThread)
    thread sees message, calls PostQuitMessage
main thread WFSO returns
main thread closes handles
main thread delete pthread

--
Scott McPhillips [VC++ MVP]

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