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many o f the same dangerous issues that were just mentioned for synchro nous cancellation
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BOO l WINAPI C a n c e l l o E x ( HAND l E h F i l e , lPOV E R lAPPED IpOv e r l a p ped ) ;
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When invoked on h F i l e with a NU L L I pOv e r l a p ped, any outstanding asynchronous I / Os in the process for that particular file will be marked for cancellation You can also specify a particular L POVE R LAPP E D structure, which, as you may guess, only cancels those asynchronous I / Os on the target file that pertain to that particular OVE R LAPP ED If no such I/Os can be found, the function returns FALS E and Get L a s t E rror will return E R ROR_NOT_FOUND
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This chapter provided an overview of some of the most important I / O capabilities supported by the Windows OS, with a particular eye on concurrent programming The most important capability is true first-class support for asynchronous I / O, enabling a device to execute an I / O opera tion fully asynchronously without needing an OS thread blocked waiting for completion This takes advantage of the natural asynchrony in the hard ware For highly concurrent programs-particularly server applications with high throughput demands-this can offer a substantial boost to scal ability and reduction in memory usage We saw that files, pipes, and sock ets, specifically, each support slightly different variants on the same idea We concluded with a look at how to cancel runaway I/O operations whose results are no longer needed And this was a convenient way to end the chapter Next we will focus on graphical user interfaces (GUIs) on Win dows Building a responsive GUI almost always involves some kind of inter action with asynchronous I /O, and it is becoming increasingly necessary for applications to provide cancellation capabilities With that, let's turn to GUIs
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A Jones, A Deshpande Windows Sockets 20: Write Scalable Winsock Apps Using Completion Ports MSDN Magazine (2000) G Ma ffeo, A Sliwowicz Win32 I / O Cancellation Support in Windows Vista
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Microsoft I / O Prioritiza tion in Windows Vista : Recommendations for Applica tion, Driver, and Device Developers for Supporting I / O Prioritization in Windows Vista Microsoftcom Whitepaper (2006) J Richter, J D Clark Programming Server-Side Applications for Windows 2000 (MS Press, 2000) M Russinovich Windows Administration: Inside the Windows Vista Kernel: Part 1
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opers writing concurrent programs Due to the same shared message loop oriented architecture that all Windows CUI frameworks use, concur rency is often an unavoidable necessity to deliver a responsive experience The reason is subtle Each window has a special CUI thread whose job is to process messages in its own dedicated message queue This entails responding to button clicks, repainting the screen, and the like, usually by running application specific event handlers All events are processed sequentially, one after the other Code on this thread must be written with great care, however, because any blocking due to I / O or synchronization activity will delay processing the window's messages If an event handler is called in response to button click, for example, and it loads a file over the network, the application is apt to freeze up while it loads To prevent these kinds of problems, high latency and computationally intensive work should never happen on the CUI thread To make matters slightly more complicated, most CUI frameworks also require that code is running on the CUI thread in order to update UI widgets This means that even if you manage to marshal work off the thread, you'll need to get back onto it later Accomplishing all this requires a bit of knowledge about how threading works, and, of course, the various ways in which interthread communication can be implemented There are many facilities meant specifically to make this easier, particularly in the NET Framework
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