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Using Event Channels in Java Print pdf417 2d barcode in Java Using Event Channels

7. Using Event Channels using none toincoporate none in asp.net web,windows application Visual Studio .NET 2003 # %e s i p o i n t s a t end o f s r c # %e d i p o i n t s a t end o f d s t # c o n v e r none for none t words t o b y t e s # s k i p l o o p i f n o t h i n g t o copy # p r e d e c r e m e n t i n g copy l o o p. # f i n a l %e d i i s t o p o f merged This bit of e none for none vent handler code is highly platform-speci c, and needs to be rewritten for other architectures. It gives some abstraction, however, and our real event handler can now be in do hypervisor callback , which can be de ned as some C code. This, quite messy, function is shown in Listing 7.

14, and is from the event.c le in this chapter s sample code. Listing 7.

14: Event callback function. [from: exampl es/chapter7/event.c]. 67 / D i s p none none a t c h e v e n t s t o t h e c o r r e c t h a n d l e r s / 68 v o i d d o h y p e r v i s o r c a l l b a c k ( s t r u c t p t r e g s r e g s ) 69 { 70 unsigned i n t p e n d i n g s e l e c t o r ; 71 unsigned i n t n e x t e v e n t o f f s e t ; 72 v c p u i n f o t vcpu = &s h a r e d i n f o . v c p u i n f o [ 0 ] ; 73 / Make s u r e we don t l o s e t h e e d g e on new e v e n t s . .

. / 74 vcpu >e v t c h n u p c a l l p e n d i n g = 0 ; 75 / S e t t h e p e n d i n g s e l e c t o r t o 0 and g e t t h e o l d v a l u e a t o m i c a l l y / 76 p e n d i n g s e l e c t o r = xchg (&vcpu >e v t c h n p e n d i n g s e l , 0 ) ; 77 w h i l e ( p e n d i n g s e l e c t o r != 0 ) 78 { 79 / Get t h e f i r s t b i t o f t h e s e l e c t o r and c l e a r i t / 80 next event offset = f i r s t b i t ( pending selector ) ; 81 p e n d i n g s e l e c t o r &= ( 1 << n e x t e v e n t o f f s e t ) ; 82 unsigned i n t event ; 83 84 / W h i l e t h e r e a r e e v e n t s p e n d i n g on unmasked c h a n n e l s / 85 while (( event = 86 ( shared info . evtchn pending [ pending selector ].

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