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14 describes asynchronous I/O, which provides two techniques that allow multiple read and write operations to take place concurrently with other processing It is not necessary to use threads; only one user thread is required In most cases, multiple threads are easier to program than asynchronous I/O, and thread performance is generally superior However, asynchronous I/O is essential to the use of I/O completion ports, which are extremely useful when building scalable servers that can handle large numbers of clients Waitable timers are also described in 14
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Kevin Miller's Professional NT Services thoroughly covers the subject Device drivers and their interaction with services were not covered in this chapter; a book such as Walter Oney's Programming the Microsoft Windows Driver Model, Second Edition, can provide that information
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Exercises
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131 Extend serviceSK to accept pause controls in a meaningful way 132 ServiceShell, when interrogating service status, simply prints out the numbers Extend it so that status is presented in a more readable form 133 Convert serverNP (Program 11-3) into a service 134 Modify serviceSK so that it uses event logging
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14 Asynchronous Input/Output and Completion Ports
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Input and output are inherently slow compared with other processing This slowness is due to factors such as:
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Delays caused by track and sector seek time on random access devices (such as discs and CDROMs) Delays caused by the relatively slow data transfer rate between a physical device and system memory Delays in network data transfer using file servers, storage area networks, and so on
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All I/O in previous examples has been thread-synchronous, so that the entire thread waits until the I/O operation completes This chapter shows how a thread can continue without waiting for an operation to completethat is, threads can perform asynchronous I/O Examples illustrate the different techniques available in Windows Waitable timers, which require some of the same techniques, are also described here Finally, and more importantly, once standard asynchronous I/O is understood, we are in a position to use I/O completion ports, which are extremely useful when building scalable servers that must be able to support large numbers of clients without creating a thread for each client Program 14-4 modifies an earlier server to exploit I/O completion ports
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Overview of Windows Asynchronous I/O
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There are three techniques for achieving asynchronous I/O in Windows
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Multithreaded I/O Each thread within a process or set of processes performs normal synchronous I/O, but other threads can continue execution Overlapped I/O A thread continues execution after issuing a read, write, or other I/O operation When the thread requires the I/O results before continuing, it waits on either the handle or a specified event Windows 9x supports overlapped I/O only for serial devices such as named pipes Completion routines (or extended I/O) The system invokes a specified completion routine within the thread when the I/O operation completes Windows 9x does not support extended I/O for disk files
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The threaded server in 11 uses multithreaded I/O on named pipes grepMT (Program 7-1) manages concurrent I/O to several files Thus, we have already written programs that perform multithreaded I/O to achieve a form of asynchronous I/O Overlapped I/O is the subject of the next section, and the examples implement file conversion (ASCII to Unicode) using this technique in order to illustrate sequential file processing The example is a modification of Program 2-4 Following overlapped I/O, extended I/O with completion routines is explained Note: Overlapped and extended I/O can be complex, seldom yield performance benefits, may even harm performance, and, for file I/O, work only on Windows NT Threads overcome these problems, so some readers might wish to skip ahead to the sections on waitable timers and I/O completion ports, referring back as necessary On the other hand, you will find asynchronous I/O concepts in both old and very new technology, so it can be worthwhile to learn the techniques For example, COM on NT5 supports the asynchronous method call, and many readers who are using or will be using COM may find this feature useful Also, the asynchronous procedure call operation ( 10) is very similar to extended I/O, and, while my personal preference is to use threads, others like to use this mechanism
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