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BOO L WINAPI SetThread poolTh readMi n imum ( PTP_POO L pt p p , DWORD c t h rdMic ) ; VOI D WINAPI SetTh read poolTh readMa ximum ( PTP_POO L pt p p , DWORD c t h rdMost ) ;
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The SetTh r e a d pool Th r e a d M i n i m um function can fail, in which case it returns F A L S E , because it actually attempts to allocate enough threads to satisfy the minimum Once it has returned successfully, there is at least the minimum number of threads specified running in the thread pool Note that it is not possible to alter the default thread pool's minimum and maximum count; instead, you must specify a pointer to a custom TP_POO L object Prior to Vista, you could change the process-wide default pool's max imum (as we see later) The reason this capability has been removed is because it depends on races: the last component to call the API would win This can cause conflicts between components in the same process that are unaware of each other but want different maximum or minimum values
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Cleanup Groups Whenever a thread pool object is returned from one of the APIs we've reviewed above, it must later be cleaned up with the respec tive close function This point has probably already been driven home sim ply However, the thread pool offers a feature called cleanup groups, which allows you to cleanup all such objects that have been associated with a par ticular environment with one API call This takes advantage of the fact that all of these objects are reference counted internally Cleanup groups also allow you to specify a callback that will get invoked when either the group is being freed or work in the queue is canceled, providing an opportunity for you to free any arbitrary state that is used by callbacks within the group The first step to using a cleanup group is to call C re a t eTh r e a d poo l
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PTP_C L EANUP_GROUP WINAPI C reateTh readpoo l C l ea n u pGrou p ( ) ;
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This allocates a new TP_C L EANU P_G ROUP structure and returns a pointer to it If allocation of the data structure fails, NU L L is returned, and, as usual, Get L a s t E r r o r can be used to retrieve details The group is not used at all until you associate it with an environment
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VOI D SetThread poolC a l l b a c k C l e a n u pG rou p ( PTP_CAL L BACK_ENVI RON p c b e , PTP_C LEANUP_GROUP p t p c g , PTP_C L EANUP_GROUP_CANCE L_CAL L BAC K pfng );
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The callback pf n g is optional and is a function pointer of type
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VOI D CAL L BAC K C l e a n u pGrou p C a n c e l C a l l b a c k ( PVOID O b j e ctContext , PVOID C l e a n u pContext )j
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If specified, the pfng callback will be invoked once a call to C l o s eThrea d poo l C le a n u pG ro u pMem b e r s has been made (more on that momentarily) This provides a hook for any sort of custom application specific cleanup logic, for example freeing memory used by all callbacks within a particular group For those familiar with garbage collection based systems, this functionality is a bit like a finalizer for the whole cleanup group To actually initiate the cleanup, which includes waiting for all (and pos sibly canceling any outstanding) callbacks and running the pfng callback (if specified), you can make a call to the CloseTh readpoolClea n u pGroupMembers function
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VOI D WINAPI C loseThreadpoo l C l e a n u pGrou pMembe rs ( PTP_C L EANUP_G ROUP p t p c g , BOOL fCa n c e l Pe n d i ngCa l l ba c k s , PVOID pvC l e a n u pContext j )
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This will return once all of pt p c g's callbacks are either completed or can celed If fCa n c e l Pe n d i ngCa l l b a c k s is F A L S E , the function must wait for any pending callbacks to get scheduled and to finish running Otherwise, if it's TRUE, callbacks that haven't been scheduled yet will be removed from the queue and will never execute The pVC l e a n u pCont ext pointer is some appli cation specific opaque value that is passed to the C l e a n u pG ro u pC a n c e l C a l l b a c k as its C l e a n u pCont ext argument This API is similar to the Wa i t F orTh r e a d poolWo r k C a l l b a c k s and related APls we looked at above, but is more convenient for a number of reasons To start with, you needn't track all of the individual thread pool objects by hand, which you would have had to do with the individual wait functions Additionally, this synchronizes with timer expirations and wait registra tions so you can be assured all outstanding callbacks have completed and that no additional callbacks will be created for these objects in the future Perhaps the most common need for C l o s eTh r e a d poo l C l e a n u pG ro u p Mem b e r s i s to synchronize DLL unloading I f you have written a service
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