ResetEvent()的目的； [英] Purpose of ResetEvent();

问题描述

ResetEvent()的目的是什么，尽管我们可以使用CreateEvent()，SetEvent()和WaitForSingleObject()函数完成任务?

解决方案

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

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.

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;
}

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