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completed, it will return or throw right away; otherwise, it will block waiting for completion When the call returns or throws, the asynchronous operation is complete 2 Any thread with access to the IAsyn c Re s u lt can use the Asyn cWa it H a n d l e to block until the concurrent work has finished 3 Any thread with access to the IAsyn c R e s u l t (usually the thread that started the work) can "poll" for completion by checking the I s Com p l eted flag When the asynchronous work has finished, the I s Com p l et e d flag will be set to t r ue, and it is then safe to call E n d F oo 4 Finally, a callback may be supplied to Beg i n F oo, which is called when Foo finishes This typically executes on a thread pool thread, and inside the callback code you can make a call to E n d Foo to retrieve the results You can also mix a combination of these things, though you have to be somewhat careful You must ensure no two threads ever call E n d Foo on the same IAsyn c Re s u l t While some APM providers may handle this situation, it is not a standard part of the pattern Should you depend on one particu lar implementation handling this, you're apt to encounter race conditions and compatibility problems down the road Now we'll look at an example program that uses a synchronous method Foo and, specifically, how we can morph the program into using Begin Foo and each of these completion mechanisms instead This is more of a case study walkthrough of the completion mechanisms and will be useful to illustrate practical concerns that will arise when you try to consume the APM from your own code Here is the original synchronous program.

The growth of community and metropolitan area networks has increased manifold in the last ve years or so and is expected to double every 35 years This segment represents an emerging market for provisioning a range of broadband, enterprise, voice and storage services If we broadly divide high-speed networking into three classi cations of long-haul, metropolitan and access/ rst mile networks, then the backbone for community networks ts perfectly into the metropolitan area The metropolitan area is an emerging business sector, mapping multiple services to high-speed network infrastructure Topologically, backbones for community networks are generically spanned across rings, and the choice of transport is relegated to the optical ber The choice of optical ber is appropriate, on account of the vast bandwidth it provides, in addition to the ability to seamlessly scale the system The scalability aspect of optical ber-based backbone networks is brought about by the advent of wavelength division multiplexing (WDM) whereby multiple frequency differentiated channels are made to occupy the near in nite (> 25 THz) bandwidth offered by the ber Community backbone/metropolitan area networks (MANs) have two key functions to perform in the hierarchy of providing end-to-end services The rst function is that of transport, whereby high-speed connections or lightpaths [1] are set up between source-destination pairs The second function is that of data aggregation Network elements that support the backbone have the ability to aggregate several lower speed traf c streams into a single high-speed connection thereby saving cost, as well as optimizing network performance Topologically,

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

167 168

T t; t ry {

F oo ( v ) ; 53 ( t ) ;

} c a t c h ( 50me E x c e ption e ) { 54; } 55; ret u r n t ; }

Broadband Services: Business Models and Technologies for Community Networks Edited by I Chlamtac, A Gumaste and C Szab C 2005 John Wiley & Sons, Ltd ISBN 0-470-02248-5 o

The markers S O 55 are meant t o indicate some set o f program state ments that are immaterial to the example itself What is important about them is the control flow and when they will execute For simplification pur poses, imagine that no references to t are found in any of the statements except for 53 That is, the call to Foo produces a value stored in t, which is returned from g to f, and then f returns it without inspecting the value Where are the opportunities for asynchronous execution here The pos sibility of race conditions and shared resources aside, Foo can run concur rently with respect to at least 55 and 51 due to the lack of control dependence It can run concurrently with 50 too, but because the call to Foo is dependent on the output of 52, we would need to restructure the code somehow, probably issuing 52 before SO We'll now work our way through the rendezvous techniques: from mechanism #1 to mechanism #4 You will find that #1 is generally the least different from the sequential code while #4 is generally the most different

170 170 171 172 173 174

If we wanted 55 to be run concurrently with the call to F oo, 53, and 54, we could change the Foo call to a Beg i n Foo call and then shuffle the code around slightly

T f( ) { T gO {

rema i n s t h e s ame }

The Current State of Broadcasting Going Digital News Automation The Virage Broadcast Solution Digital Video Archiving Web Publishing

.

Begi n F oo ( v ) ;

T t; t ry { t E n d F oo ( a sy n c R e s u l t ) ; 53(t ) ; } c a t c h ( 50me E x c e ption e )

} ret u r n t ; }

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