VOID WINAPI SetThread poolWa it ( PTP _WAIT pwa , HANDLE h , P F I LETIME pftTimeout in VS .NET

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VOID WINAPI SetThread poolWa it ( PTP _WAIT pwa , HANDLE h , P F I LETIME pftTimeout
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Once you call this function, the thread pool will move the newly regis tered HAN D L E on to one of its wait threads If all current threads are wait ing on 63 objects already, then a new thread will be spun up After this happens, as soon as h becomes signaled, the callback associated with pwa will be queued to run on one of the pool's callback threads All of the usual kernel object wait rules apply: that is, auto-reset events being reset when the wait is satisfied, only one thread being awakened, and so on You may call SetTh r e a d poolWa it on the same TP _WAIT object as many times as you please for any number of unique HAND L E s You can also supply a timeout when registering a callback Passing NU L L for pftTimeout means that no timeout i s required Timeouts here use the same F I L ETIME scheme as described for timers: a negative value indicates that the timeout is relative to the current time, while any other value
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represents the absolute time at which the wait will expire When a timeout occurs, your callback will still execute and the Wa i t R e s u l t argument to the w a i t C a l l b a c k routine will be WAIT_TIM EOUT rather than the usual WAIT_OB J E CT_e If one of the objects being waited on is a mutex that was abandoned, the wa i t Re s u lt will be WAIT_ABANDON E D_e (Registering a wait for a mutex is an extraordinarily bad idea due to thread affinity, as we'll see in more detail shortly) If you call SetTh r e a d poolWa i t multiple times with the same TP_WAIT object, the last call will override previous calls If the new value of h is N U L L, no waits will be associated with the TP _WAIT object after the call to Set T h r e a d poolWa it is complete If NU L L is specified, or if a new HAND L E value i s provided, the thread pool internally notifies the thread waiting on the previously specified HAN D L E and it is removed from its wait set Once a callback has occurred for a particular HAN D L E , that object is removed from the thread's wait set If you'd like to register another callback to occur when the kernel object becomes signaled again, you can make a call to SetTh r e a d poolWa i t in your callback
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HAN D L E my Wait Obj e c t
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PTP_WAIT my Wait C reateTh read poolWa it ( &MyWa itCa l l ba c k , , Set Thread poolWa it ( myWa it , my Wait Obj e c t , ) ;
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I I E l s ewhere VOID CAL L BAC K MyWaitC a l l ba c k ( PTP_CA L L BAC K_INSTAN C E I n st a n c e , PVOID Context , PTP_WAIT Wait , TP_WAIT_R ESULT Wa i t Re s u lt )
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II I mme d i a t e ly re - register anot h e r wait SetThread poolWa it ( Wa it , my Wait Obj e c t , ) ; II H a n d l e t h e event
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Specifying a mutex as a registration's object is usually a bad idea Mutexes have thread affinity, meaning that the wait thread that performs a wait will be considered the owner of the mutex But in this case, all the wait thread does is turn around and queue the callback to run on a thread pool callback thread The thread that will run the callback doesn' t own the mutex at all and therefore cannot release it There is no way to work around
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