VirtualizeTimerC in .NET Generation USS Code 128 in .NET VirtualizeTimerC

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Listing 9.2 VirtualizeTimerC using visual studio .net toget barcode 128 in web,windows application iReport HilTimerMilliC m ANSI/AIM Code 128 for .NET ust pass the number of timers in the system, obtained using uniqueCount(), to the new VirtualizeTimerC instance:. configuration Hi lTimerMilliC { p r o v i d e s i n t e r f a c e Init ; p r o v i d e s i n t e r f a c e Timer < TMilli > as T i m e r M i l l i [ u i n t 8 _ t num ]; p r o v i d e s i n t e r f a c e LocalTime < TMilli >; } implementation { enum { TIMER_COUNT = uniqueCount ( UQ_TIMER_MILLI ) }; c o m p o n e n t s new V i r t u a l i z e T i m e r C ( TMilli , T I M E R _ C O U N T ); TimerMilli = VirtualizeTimerC ;x // More code for w i r i n g V i r t u a l i z e T i m e r C . T i m e r F r o m }. Listing 9.3 Instantiating VirtualizeTimerC 9.1 unique() and uniqueCount(). Rather than dire Code128 for .NET ctly pass a string to uniqueCount(), HilTimerMilliC passes UQ_TIMER_MILLI, which is a #de ne (from Timer.h) for the string HilTimerMilliC.

Timer . This is a common approach in TinyOS . Using a #de ne makes it harder to run into bugs caused by errors in the string: chances are that a typo in the uses of the #de ne will be a compile-time error.

This is generally a good practice for components that depend on unique strings. Programming Hint 19 If a component depends on unique, then #de ne the string to use in a header le, to prevent bugs due to string typos. VirtualizeTimerC, in turn, allocates an array of timer state structures, whose size is determined by its max_timers parameter:.

enum { NUM_TIMER S = max_timers , E N D _ O F _ L I S T = 255 , }; typedef struct { // d e t a i l s e l i d e d } Timer_t ; T i m e r _ t m _ t i m e r s [ N U M _ T I M E R S ];. Listing 9.4 VirtualizeTimerC state allocation When a client ca lls VirtualizeTimerC s Timer interface (through HilTimerMilliC), the parameter indicates which client is making the call. VirtualizeTimerC uses the client ID as an index into the state array. For example:.

void s t a r t T Code 128B for .NET i m e r ( u i n t 8 _ t num , u i n t 3 2 _ t t0 , u i n t 3 2 _ t dt , bool i s o n e s h o t ) { T i m e r _ t * t i m e r = & m _ t i m e r s [ num ]; // u p d a t e t i m e r s t r u c t u r e }. c o m m a n d vo id T i m e r . s t a r t P e r i o d i c [ u i n t 8 _ t num ]( u i n t 3 2 _ t dt ) { s t a r t T i m e r ( num , call T i m e r F r o m . g e t N o w () , dt , F A L S E ); }.

This software st ANSI/AIM Code 128 for .NET ructure assumes that each component that needs a timer wires to HilTimerMilliC s parameterized TimerMilli using a call to unique, passing UQ_TIMER_MILLI as the key:. S o m e C o m p o n e n t C . Timer -> H i l T i m e r M i l l i C . T i m e r M i l l i [ u n i q u e ( U Q _ T I M E R _ M I L L I )];.

Requiring a prog code-128c for .NET rammer to know a service s key is problematic and bug-prone. While a #de ne for the key reduces programming errors compared to actual strings, it s still very easy for a programmer to accidentally use the wrong key, especially if an application uses many services.

Finding such a bug is a nightmare. This is essentially a problem of code duplication: even though every Timer user wants to wire in the same way, each one.
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