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this with the Vista thread pool We'll see later that the legacy APls offer a way to deal with this Finally, once you are done with a wait, you must de-allocate its associ ated memory and resources This is done with C l o s eTh r e a d poolWa i t
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VOI D WINAPI C loseThread poolWa i t ( PTP_WAIT pwa ) ;
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If there are outstanding callbacks executing for this wait object, they will be permitted to finish before the TP_WAIT memory is freed If there are no callbacks running, but a thread is waiting on a registered HAND L E associated with this TP _WAIT object, the thread will be notified and it will wake up and remove the HAND L E from its wait set You can use the Wa i t F o rTh r e a d poolWa itC a l l b a c k s function to wait for any callbacks that are in-flight to finish executing
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VOID WINAPI WaitForThreadpoolWa it C a l l ba c k s ( PTP_WAIT pwa , BOOl fCa n c elPend ingC a l l b a c k s );
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If fCa n c e l P e n d i n g C a l l b a c k s is T R U E , then any callbacks that have not yet begun executing will be canceled This does not wait for the wait associa ted with the TP _WAI T object to be satisfied or for it to timeout, it merely ensures any existing callbacks are completed For the same rea son, you must be careful with timers and synchronizing the release of resources that a callback will use You must also be careful with wait reg istrations because they may be satisfied immediately after your wait returns The ordinary C reateTh r e a d poolWa i t , Set T h r e a d poolWa i t, and C l o s e T h r e a d poolWa it sequence can be illustrated by this code sample We allo cate a set of events, register waits for them all, and sit in a loop signaling them for a little while Error checking is omitted for brevity We also don' t synchronize with the completion of wait registrations and callbacks-we'll discuss why in just a moment
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# i n c l u d e < stdio h > #def i n e _WI N 3 2_WINNT axa6aa # i n c l u d e <windows h > const int g_c Events 8; HANDLE g_h Event [ g_c Event s ] ;
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v o i d I n it F i leTimeWithMs ( P F I LETIME pft , DWORD dwMi l l i second s ) { LARGE_I NTEG E R c v ; c v Qua d P a rt - LONG64 ) dwMi l l i s e c o n d s * 1eee * 1e) ; pft - > dwLowDateTime c v LowPa rt ; pft - > dwH ighDateTime c v H i g h P a rt ;
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VOID CAL L BAC K WaitCa l l ba c k ( PTP_CAL L BAC K_INSTANCE I n s ta n c e , PVOID Context , PTP_WAIT Wait , TP_WAIT_R ESULT Wa i t Re s u lt ) {
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II P r i n t some i n t e r e s t i n g info p r intf ( "'Wait : r e s u l t % u , event#%p ( t id Wait R e s u lt , reinterp ret_c a st < U I NT_PT R > ( Context ) , Get C u r rentTh rea d l d ( ;
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int ma i n ( int a rgc , wc h a r_t * a rgv [ ] ) { II I n i t i a l i z e a u t o - reset event s for ( i nt i e; i < g_c Event s ; i++ )
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g_h Event [ i ]
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C reateEvent ( N U L L , FALS E , FALS E , N U L L ) ;
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F I LETIME ft ; I n it F i leTimeWithMs ( &ft , See ) ; II Create a n d register lee wa i t s p e r event c o n s t int g_cWa i t s g_c Event s * lee ; PTP_WAIT wa it s [ g_cWa it s ] ; for ( i nt i e ; i < g_cWa it s ; i++ )
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UINT_PTR event ( U I NT_PTR ) i % g_c Event s ; wait s [ i ] C reateThread poolWa it ( &WaitC a l l ba c k , reinterp ret_c a s t < PVOI D > ( event ) , NU L L ) ; SetThread poolWa it ( wa i t s [ i ] , g_h Event [ event ] , &ft ) ;
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I I Go t h rough a n d set t h e eve n t s a b u n c h of t i me s for ( i nt i e; i < se; i++ ) for ( i nt j e; j < g_c Event s ; j + + ) Set Event ( g_hEvent [ j ] ) ;
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I I C l o s e eve ryt h i n g ( w/out wa i t i n g for c a l l b a c k s ) for ( i nt i e ; i < g_cWa it s ; i++ ) C loseThread poolWa it ( wa it s [ i ] ) ;
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