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So what are the interesting parts of this code The constructor function accepts a F u n c < T > delegate representing the actual work to be done asyn chronously It then initializes our new S i m p l eAsyn c Re s u l t < T > object and queues this work to run asynchronously with R u nWo r kAsy n c h ro n o u s ly If we look inside that function, you'll see that we use the thread pool and call the delegate from within a try block If wo r k succeeds, we store the return value in the mJe s u l t field of the object; if it throws an exception, we store that in the m_e x c e p t i o n field We do not let the exception propagate past our catch block; doing so would cause an unhand led exception on the thread pool, triggering a process crash After either of these situations occurs, we initiate the completion logic All APM implementations should perform the same completion steps in the same order: 1 Modify state so that I sComp leted will return t r u e 2 Set the AsyncWa itHa n d l e so that any waiting threads will be awakened 3 Invoke the callback supplied by the caller, if any It is important to ensure that 1 and 2 have been performed before 3, just in case the callback itself (or the E n d F o o method) depends on these things having been set And of course there's the E n d method This takes care of waiting for the asynchronous work to complete: the code checks I sComp leted first and will only call W a i tOn e on the AsyncWa i t H a n d l e if it returns fa l s e Because call ing W a i tOne is fairly expensive even for an event that has already been set, this is slightly more efficient After that, we check to see if an exception was thrown ( m_ex c e p t i o n ) ; if so, we rethrow it; otherwise, we return the result yielded by the wo r k delegate ( mJe s u l t ) Note that rethrowing an exception such as this destroys the original stack trace This is one of the areas where platform support for concurrency is lacking: if the exception goes unhand led, breaking into the debugger will bring you to the t h row m_exception statement in SimpleAsyn c Re s u lt < T >.

Table 91 Enabling WDM technologies Principle Erbium-doped or Raman ampli ers known Position in WDM network

Asyn c h ro n o u s Progra m m i n g M o d e l (A P M )

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nously) In fact, the thread from which the exception was thrown will have been returned to the pool This means any thread local state, including local variables on the thread's stack, will not be available We always return f a l s e for the CompletedSyn c h ro n o u s ly property Returning t r u e is a relatively obscure situation that doesn't happen much It must return t r u e if the thread being used to execute the callback is the same thread that was used to invoke the B e g i n Foo operation in the first place Because our code always queues work to run in the thread pool, this isn't ever possible Some APM implementations are clever enough to run the callback on the current thread if it doesn't make sense to run the code asynchronously In these cases, your callback could end up using a lot of stack (unexpectedly) if it tries to continue to call Beg i n Foo over and over again from within the completion callbacks The F i leSt re a m class's Begi n R e a d and Beg i nW r i t e operations, for example, can result in this behavior because Windows asynchronous I / O may be able to finish the I / O opera tion so quickly that transferring the callback to another thread isn't neces sary We discuss this possibility more in 1 5, Input and Output Most programs can remain unaware of Comp letedSy n c h ro n o u s ly Once we have the S i m p l eAsy n c R e s u l t < T > class, we can wrap it with standard Begi n F oo and E n d Foo APM methods For example, Listing 82 demonstrates a simple APM variant of some synchronous Wo r k method that calls T h r e a d S l e e p and then returns a new random number:.

LI STI N G 82: A sim ple APM im plementation using S i m p leAsyncRes u lt<T> p u b l i c c l a s s Simp leAsyncOperation { p u b l i c int Work ( i nt s l e epyTime ) { Thread S leep ( s leepyTime ) ; ret u r n new Random ( ) Next ( ) ;

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