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{ I I If not a n APC , we will break and ret u r n the v a l u e brea k ; } I I W e have t o read j u st t h e t ime , verify w e haven ' t t imed out ; II then j u st loop b a c k a round to t ry t h e wait a g a i n dwE l a p s e d GetTi c kCount ( ) - dwSt a rt ; i f ( dwMi l l i s e c o n d s < dwE l a p sed )
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{ dwRet brea k ; }
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WAIT_TIMEOUT ;
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ret u r n dwRet ;
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int wma i n ( int a rgc , w c h a r_t * a rgv [ ] ) { HANDLE h a n d l e s [ 5 ] ; for ( int i a; i < 5 ; i++ ) handl es [ i ] Create Event ( N U L L , TRU E , FALS E , N U L L ) ;
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DWORD dwWa it Ret DoWa it ( ha n d le s , 5 , laaa , TRUE ) ; p rintf ( " Wait ret u rned : %u \ r \ n " , dwWa it Ret ) ; for ( i nt i a ; i < 5 ; i++ ) CloseHand l e ( h a n d le s [ i ] ) ; ret u r n a ; }
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Notice that we break under a of couple circumstances If the wait returns a timeout, we can return immediately If the wait returns and indicates that we have a message, we will drain the message queue Note that when we encounter a quit message, we must exit the wait entirely We've overloaded the WAI T_TIMEOUT return value, but for application-wide routines it is a good idea to use something else The idea is that the caller must return, and so on, and we will get back to the top-level modal loop quickly, which will quit the program As shown earlier, we will just go back around and reissue the wait if an APC happened Otherwise, we simply return the code returned by the wait API, for example, a successful wait, abandoned mutex, and so forth
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C h a pter 5 : W i n d ows Ke r n e l Syn c h ro n i z a t i o n
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We only described wait-any waits above and for good reason It's not that you can't do a wait-all wait-the APIs certainly do support it In the case of M s gWa i t F o rM u l t i p l eOb j e c t s , you must specify TRUE as the value for
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bWa itAl l, and for MsgWa it F o rMu lt i p l e Ob j e c t s E x, you supply a dw F l a g s
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argument containing the value MWMO_WAHA L L However, this brings up a very thorny issue If you didn't stop to think of it earlier, did you wonder why the value returned during a wait-any wait when a message arrives is WAH_OB J ECT_ e + nCount It's subtle The implementation of the message wait APIs just append an internal event handle to the pHa n d les array supplied as input, increment the count by one, and then pass that to the standard Wa i t F o rMu l t i p leObj ect s E x wait API instead This is why you can only supply one less than MAXIMUM_WAH_O B J ECTS handles for a message wait Why does this matter If you specify a wait-all wait, the wait will not return when all of the handles in your array are signaled; instead, it must wait for all of them to be signaled as well as a new message to arrive in the thread's message queue This is typically not what you want and can easily lead to an appli cation that seems frozen and will only wake up when the user nudges the mouse The CLR helps to avoid this problem by throwing an exception when you call W a i t H a n d l e W a i tAl l on a Single Threaded Apartment (STA) thread, because the CLR always pumps messages automatically (we'll look at that soon) But if you're writing native code, you'll have no luck and need to be careful
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Co WaitForMu ltipleHandles It is inconvenient to have to write the pre ceding boilerplate message pumping code in all of your GUI and COM pro grams Because of this very reason, on Windows 2000 and later, there is a special CoWa i t F o rMu l t i p leHa n d l e s API defined in obj b a s e h and exported from O L E 3 2 L I B
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H R E S U L T CoWa i t F o rMu l t i p leHa n d l e s ( DWORD dwF l a g s , DWORD dwTimeout , U LONG c H a nd l e s , L PHANDLE pHand l e s , LPDWORD lpdwIndex
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