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cont i n u e ; } else { II A s p e c i f i c wait wa s s a t i sfied D i s p at c h t h e fibe r index - = c Re s e rved ; II F i rst add ot her wa i t s b a c k to the queue if ( c Deq ueued F i be r s > 1 ) { EnterCrit i c a lS e c t ion ( &m_bloc ked F i b e rQueueCrst ) ; for ( i nt i = e ; i < c De q ueued F i bers ; i++ ) if ( i ! = index ) m_p B l o c k ed F i berQueue - > p u s h_f ront ( ppDequeued F i bers [ i ] ) ; LeaveC r it i c a lSection ( &m_b l o c k ed F iberQueueC r st ) ; SetEvent ( m_bloc ked F i b e rQueueNewEvent ) ;
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I I Now swit c h to t h e fiber and go if ( p pDeq ueued F ibers [ index ] - >m_p F i ber ! = pStat e ) { II If not a bloc k i n g f i b e r , a s k t h a t t hey add u s I I to t h e r u n n a b l e l i s t if ( ! bBloc ked ) ppDequeued F i be r s [ index ] - > m_pWa k i n g F iber = pStat e ; Swit c hTo F iber ( p pDeq ueued F i b e r s [ i n d e x ] - >m_p F i b e r - >m_p F ibe r ) ;
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II O n c e we ' ve been resumed , wa i t i n g i s done Our state I I might cont a i n work t h a t we need to pe rform ret u r n pState - >m_pWork ; } else { II Need to h a n d l e other ret u rn v a l u e s here ret u rn NU L L ; } } I I T h e s h u tdown f l a g wa s t r u e ret u r n NU L L ; }
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Shutdown
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The only thing left to look at is the S h u t d own method and the - F i b e rPool destructor It' s a requirement that S h ut d own be called on the pool before
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deleting it, otherwise the threads instantiated by the pool will try to concurrently access the data structures and resources that the destructor frees S h u t down handles the synchronization and blocks until all threads have been terminated cleanly Note that runaway work in the callbacks can cause this to block forever, so some form of cancellation or time based esca lation to a more aggressive shutdown policy (via Te rm i n ateTh r e a d ) may be worth considering Shutdown is simple It sets the shutdown flag, sets the event, and then waits on and closes each of the thread's HAND L E s, ensuring it doesn't return until all threads have been shut down completely
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void F i be rPool : : Shutdown ( ) { II Notify t h re a d s to exit and wait for t hem m_s hutdown F l ag = TRU E j SetEvent ( m_shutdown Eve nt ) j for ( i nt i a j i < m_t h readCount j i++ )
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{ Wa i t F o r S i ngleObj e c t ( m_t h readHand les [ i ] , I N F I N I T E ) j CloseHa n d l e ( m_t h readHandle s [ i ] ) j } }
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And as you would imagine, - F i be rPool is the inverse of F i be rPool, that is, all of the allocated resources are freed It also enumerates the global list of all fibers allocated and deletes any of them that haven't already been deleted by virtue of the fact that they were active on a thread at the time of shutdown
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II Note that t h i s is only s a fe after t h e pool s been s h u t down F i be rPool : : - F i b e rPool ( ) { II Close o u r event a n d c ri t i c a l s e c t i on s CloseHand l e ( m_shutdown Event ) j CloseHa n d l e ( m_wo rkQueueNewEvent ) j CloseHa n d le ( m_bloc ked F i be rQueueNewEvent ) j DeleteC r i t i c a lSection ( &m_wor kQueueC r st ) j DeleteC rit i c a lSection ( &m_fiberQu e u e C r s t ) j DeleteC rit i c a lSection ( &m_ru n n a b l e F i b e r L i s t C r s t ) j DeleteCrit i c a lSection ( &m_b loc ke d F i be rQueueC r st ) j I I Delete t h e f i b e r s a n d a s so c i ated state for ( std : : d e q u e < F ibe rState * > : : iterator it it ! = m_p F i berQueue - > e nd ( ) j it++ )
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