pftDueTime If the timer is already a recurring timer, then subsequent recur in VS .NET

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pftDueTime If the timer is already a recurring timer, then subsequent recur
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rences will be based on the new m s P e r iod, including turning the recurring timer into a one-shot timer if m s P e r iod is specified as e If the timer is a one shot timer and has already fired, it will be rescheduled based on the new times
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Closing and Stopping Timers Just as with TP _WO R K objects, the TP_T IME R objects returned from C r e a t e T h r e a d pool T i m e r must be deleted when you
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are finished with them This is done with the C l o s e T h r e a d pool T i m e r function
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VOI D WINAPI C l o s eThread poolTime r ( PTP_TIMER pti ) ;
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We've seen that you can create a one-shot timer or a recurring timer If you choose to create a recurring timer, it will keep firing indefinitely until you explicitly stop it There are two ways to stop an already registered timer from firing One is to make a call to SetTh r e a d poolTimer with a NU L L value
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for the pftDueTime argument (Or, alternatively, specify a real pftDueT ime but pass e for the m s P e r iod, in which case it will fire only once more) Alternatively, you can just close the timer with a call to C l o s eTh r e a d poolTimer, which also stops the timer from expiring in the future In both cases, there may be callbacks queued to execute, and stopping the timer doesn't prevent those from executing: it only prevents future callbacks for the particular timer from being generated A recurring timer's next expiration date is set at the time the timer actu ally expires, not when the timer 's callback finishes working Imagine, for instance, that you have a timer that expires every 1 0 milliseconds and whose callback takes 20 milliseconds to run; there will be a never-ending backlog of timer callbacks to execute in this scheme If you want the timer 's expira tion time to be set based on when the timer callback finishes-which for this example is a bit like setting the timer's recurrence to 30 milliseconds-then you must queue your timer as a one-shot timer (ie, e for m s P e r iod) and then make a call to SetTh r e a d pool Timer at the end of the callback routine to keep it going
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Timer Internals Timers are implemented with a single process-wide thread, created the first time a timer is registered in the process There is a single kernel waitable timer object This thread sits in a loop, calculates how long it should wait based on the next-to-expire timer, sets the kernel timer object's expiration time, and then waits When it wakes up, it queues the timer callback to run on one of the work callback threads and updates that particular timer's expiration time (for recurring timers) or removes the timer from its wait list (for one-shot timers) and then goes back to waiting If you think about this scheme for a moment, you will realize why the msW i n dow L e n g t h argument to C re a t eTh r e a d po o l T i m e r can make a differ ence for performance If many timers expire close together, but not quite at the same time, then the pool will have to continuously sleep and wake back up for very small periods of time, creating substantial context switching overhead Permitting the pool to lump expirations together can improve the performance of timer dispatch dramatically Waiting for Timer Callbacks to Complete As with work item call backs, you can wait for all outstanding timer callbacks that have
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