One way communication between two threads through Events

I have two threads that communicate in the following way: Thread A posts a message in a message queue and Thread B processes that message. Thread A has to wait until Thread B processes the message.

1. Thread A

   .........

   post a message on the message开发者_开发百科 queue

   WaitForSingleObject (hEvent)

   Use the message processed information

   SetEvent(hEvent)

   .........

2. Thread B

   Process the message in the message queue

   SetEvent(hEvent)

Do you see any problems with the above code? Do I need to call ResetEvent() anywhere? Is the SetEvent() call required in Thread A or Thread A should only call WaitForSingleObject() and Thread B should only call SetEvent()?

Thanks in advance

You needn't call ResetEvent as long as the event is an AutoReset Event. This parameter is set in CreateEvent. I think your pseudocode is OK.

A problem you will need to consider is the potential deadlock with this. If Thread A has to wait until Thread B processes the event before continuing (and your WaitForSingleObject call does not have a useful timeout value passed to it), there is a chance that Thread B will never process the event and will lock Thread A.