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If multiple completion entries are available on the specified port HAN D L E , this function will retrieve u p t o u l C o u n t o f them It stores the count in u l N u m E nt r i e s Removed and, for each completion entry, an associated struc ture in the output l pComplet i o n P o rt E n t r i e s array When calling this API, you must ensure the array is large enough to store up to u l C o u n t entries since that is the maximum number of records Windows will try to write to the array The dwMi l l i s e c o n d s argument allows a timeout to be specified, and fAl e rt a b l e controls the alertability of the wait used internally Each entry is represented by a new OV E R LAP P E D_ENTRY structure
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typedef struct _OVER LAPPED_ENTRY
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U LONG_PTR l pComp l et io n K eY j LPOV E R LAPPED l pOve r l a p ped j
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U LONG_PTR I nterna l j DWORD dwNumbe rOfBytesTran sferred j } OVE R LAPPED_ENTRY, * L POV E R LAPP E D_ENTRY j
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Each of these fields (except for I n t e r n a l, which is reserved for internal use) maps to the respective output parameter for the ordinary GetQu e u e d Complet ionStat u s API In most cases, completion packets will be posted automatically when Win32 device operations complete But you can also manually post a com pletion packet
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BOOL WINAPI PostQue u edCom p l etionSt a t u s ( HANDLE Comp let ionPort , DWORD dwNumbe rOfByt e s T r a n sfer red , U LONG_PTR dwCompletionKey , LPOV E R LAPPED l pOve r l a p ped )j
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Posting a packet manually to the Comp letion Port specified allows you to generate work for a waiting thread The waiting thread will awaken with access to the dwN umbe rOfBytesTra n sferred , dwCompletion Key, and l pOve r la pped structure set in its output arguments This feature allows you to treat an I/O completion port as if it were a thread pool In fact, as was mentioned previously, the CLR's thread pool offers the U n s afeQueueNativeOve r l a pped method for this very purpose It internally uses PostQueu edComp l et ion Stat u s For more details, refer to 7, Thread Pools
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As with other local devices, the sockets APls enable asynchronous network operations The process of using them is similar to asynchronous file I/O, so all of this should sound quite similar To use a socket asynchronously, you must first open it for overlapped execution using the WSASo c ket function, which can be found in the W i n s o c k 2 h platform header (and W s 2_3 2 l i b and W S 2_3 2 d l l Winsock static and dynamic link platform libraries)
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SOC K E T WSASoc ket ( int a f , int t y p e , int p rotoc o l , L PWSAPROTOCOL_I N F O l p P rotoc o l l nfo, GROUP g, DWORD dwF l a g s
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To open for overlapped execution, pass the WSAJ LAG_OV E R LAPP E D flag to
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WSASoc ket as part of its dwF l a g s argument Once you have done this, you
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can use the resulting SOC K E T asynchronously in any of the following socket functions Whether asynchronous execution is used or not is solely deter mined on whether the overlapped structure is NU L L
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BOO L Ac c e p t E x ( SOC K E T s L i st e nSoc ket , SOC K ET sAc c e ptSoc ket , PVOID lpOutputB uffe r , DWORD dwRec eiveDat a Le n gt h , DWORD dwLoc a lAdd r e s s Lengt h , DWORD dwRemoteAd d r e s s Lengt h , L PDWORD l pdwByt e s R e c e i ved , L POVE R LAPPED lpOv e r l a p p e d int WSASend ( SOC K E T s , L PWSABUF l p B uffe r s , DWORD dwBufferCount , L PDWORD lpNumberOfByt e s S e nt , DWORD dwF lag s , L PWSAOV E R LAPPED l pOve r l a p ped , L PWSAOV E R LAPPED_COM P L E T ION_ROUTINE l pComp l e t i o n R o u t i n e i n t WSASendTo ( SOC K E T s ,
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