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If there are outstanding submitted callbacks for the T P_WO R K object at the time that C l o s eTh r e a d poolWo r k is called, the thread pool will note the request for deletion and defer the actual freeing operation until all associ ated callbacks finish This is possible because internally the thread pool uses reference counting to track which threads are using the object, ensur ing that memory is never freed prematurely Thus, it's actually safe to close the object immediately after calling S u bm i tTh r e a d poo lWo r k one or more times, or within the callback itself, alleviating a whole set of coordination issues that would have otherwise arisen With the TrySu bmitTh r e a d poolC a l l b a c k mechanism for creating work, you didn' t need to worry about freeing any memory It's not that there aren't any TP_WOR K objects involved-there are-it's just that the thread pool internally handles allocating and freeing them at the appropriate times

95 90 80 70

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Waitingfor Work to Finish After you've queued up some work, it's quite common that you will need to block the thread waiting until all of the work has finished We'll see many common patterns in 1 3, Data and Task Parallelism; for example, fork/join concurrency often involves a single mas ter thread that spawns some number of children and then waits for them

VOI D WINAPI Wa i t F o rThreadpoolWor k C a l l ba c k s ( PTP_WORK pwk , BOO l fC a n c e l Pe n d i n gC a l l b a c k s

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This has been a very brief introduction to the design of experiments Much more is known about this subject and the interested reader is referred to more advanced books on this subject We have made use of the geometry here in analyzing experimental data since that provides a visual display of the data and the conclusions we can draw from the data

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Pass to this API a pointer to the TP _WORK object you'd like to wait for, and it will block the calling thread until all scheduled work associated with pwk completes (Le, all calls to S u bmitTh r e a d poolWo r k, in case there are multi ple) This function doesn't validate its arguments and can fail or corrupt state if you pass an invalid PTP _WOR K as pwk This API blocks the calling thread using a non-alertable, non-message pumping wait If you pass T R U E for fCa n c e l Pe n d i ngCa l l b a c k s , any pwk work that is still in the thread pool's callback queue (ie, hasn't begun executing yet) will be canceled and removed from the queue, subject to timing and the inherent race conditions involved If all work is canceled successfully, the API may not need to wait before returning Any work that is already executing cannot be canceled using this mechanism Please refer to 13 for a more general discussion of cancellation If there is outstanding work in the thread pool's queue and all other threads in the system exit, the process will exit This can lead to dropped work In fact, if work is actively executing on thread pool threads while process exit is initiated, each of them is terminated right in its tracks with out unwinding the stack (via Te r m i n ateTh r e a d ) To prevent this, you need to synchronize process shutdown with the outstanding callbacks that are required to execute One way of doing this is to use Wa i t F o rTh r e a d pool Wo r kC a l l b a c k s during your program's shutdown coordination code If you do this, you must be very careful: you cannot pass a timeout to the API and holding up shutdown indefinitely is a recipe for problems If the callback running on a thread pool thread causes an exception that goes unhandled, the process will terminate via the ordinary unhand led exception logic described in 3, Threads There is one special case in which the Vista thread pool catches an exception: stack overflow If code running on a thread pool thread triggers a stack overflow, the thread pool.