Purpose of ResetEvent();

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What is the purpose of ResetEvent(), While we can complete the task by using CreateEvent(),SetEvent() & WaitForSingleObject() functions?

Posted 29-Jun-11 18:28pm

PurushothamanS

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Sergey Alexandrovich Kryukov 1-Jul-11 0:22am

It looks like you thinks you known why using SetEvent.
In this case, I do not understand, how it's possible to not understand why using ResetEvent.
--SA

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Chuck O'Toole · Answer 1 · 2011-06-29T19:18:00

Google is your friend, use it well.

http://msdn.microsoft.com/en-us/library/ms685081(v=vs.85).aspx[^]

According to MSDN

The ResetEvent function is used primarily for manual-reset event objects, which must be set explicitly to the nonsignaled state. Auto-reset event objects automatically change from signaled to nonsignaled after a single waiting thread is released.

barneyman · Answer 2 · 2011-06-29T19:16:00

ResetEvent() is for 'un'SetEvent()'ing

In your use case you're obviously using the event singularly, but there are cases where the WaitForSingleObject() is within a loop and will be called again, normally in a job workerthread scenario (although PulseEvent() may be more appropriate sometimes)

main thread

// pseudo code
for(int loop=0;looper<10;looper++)
{
// add job
AddJobToWorkerThread();
// signal a new job is to be done
SetEvent(newJobToBeDoneEvent);
// and sleep
Sleep(10000);
}

workerthread

// 
while(!threadToBeTerminated)
{
if(WaitForSingleObject(newJobToBeDoneEvent,5000)==WAIT_OBJECT_0)
{
// do the job we were posted
...
// then clear the flag and wait again
ResetEvent(newJobToBeDoneEvent);
}
else
   break;
}

Purpose of ResetEvent();

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