Multiple threads waiting on the same event handle in C++

Summary

If multiple threads are concurrently waiting on the same event handle, as in:

WaitForSingleObject(theHandle, INFINITE);

and the event is initialized to be manual-reset, as in:

// manual-reset and initial-state set to true
theHandle = CreateEvent(nullptr, true, true, nullptr);

then once the event is set, will all threads resume?

A little more detail

This example seems to indicate that they would all resume, without actually coming out and saying either way:

http://ift.tt/1B8necF

In my particular case, I have a small block of code where the event is manually reset, and in short order set again. i.e.:

ResetEvent(theHandle)

// Do some things that should not lock at all let alone deadlock

SetEvent(theHandle)

Then in practice I observe that some of the calls to wait for the event to be set will wait there indefinitely:

WaitForSingleObject(theHandle, INFINITE); // Hello, deadlock

The only things I can think of are that events don't work the way I think they should, hence the question, or that my "safe, lockless" code referred to above, isn't actually so safe and lockless.