CoWaitForMultipleHandles and WaitForSingleObjectExdont work for me

Question

I have created a thread which does polling to a service at regular intervals. To introduce the delay between successive polls, I am trying to use the above methods.

HANDLE m_event;

DWORD dwsignalled;

 // Create an event that will never happen.
  m_event= CreateEventEx(0, FALSE, FALSE, 0);

CoWaitForMultipleHandles(COWAIT_WAITALL, 60*1000, 1, &m_event, &dwsignalled);

But this does not seem to block the thread.

I also tried DWORD wait = WaitForSingleObjectEx(m_event, MAX_WAIT_DELAY_MS, false);

That does not work either.

Answer 1

Have you considered the ThreadPoolTimer::CreateTimer to accomplish this polling? The Thread pool sample demonstrates the use.

Try this to get the WaitForSingleObjectEx call to work as desired:

HANDLE m_event;
m_event= CreateEventEx(NULL, NULL, CREATE_EVENT_MANUAL_RESET, EVENT_ALL_ACCESS);
WaitForSingleObjectEx(m_event, 60000, false);

Thanks!

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David Lamb

Answer 2

Ya. I did go with the the CreateTimer function. Thanks!