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Asynchronous file I/O is distinctly different from synchronous file I / O i n one interesting way; unlike synchronous I / O where each file HAN D L E tracks the current position pointer, enabling each read and write t o pick up where the previous one left off, asynchronous I/O requires that the starting offset is specified for each new file operation In other words, if you've already read 4,096 bytes from the file, you will need to explicitly pass 4,096 as the start of the next read The offset is specified with the DWO RD fields

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A cable channel wants to simplify storage of its media archive while providing universal access for purchasing and downloading Media are stored in a high-quality MPEG format in a digital archive A request to browse a particular clip comes in through the Web site The assetmanagement system identifies the archived clip and tells the FlipFactory where to get it FlipFactory localizes the file, flips it into the proper format, inserts a watermark to ensure that the owner s rights are protected, and delivers the file to the streaming server for immediate playout Then, when the customer chooses to purchase the clip, FlipFactory is called on again to deliver the clip in the specified high-quality format

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a 64-bit value as ( Offset I LONG LONG ) OffsetHigh 3 2 Note that this requiremen t applies to file I/O only: these fields must be explicitly set to e for nonfile I/O operations, otherwise reading and writing will return an error In addition to requirements around Off set and Off s e t H i g h , the read and write APls also require that the h E vent field of the OVE R LAP P E D structure be set We'll see how it gets used in the various completion methods below, but for now we will always set it to N U L L End o f file i s treated subtly differently when doing asynchronous I / O too Instead o f completing the I/O and simply saying that 0 bytes were read, the API will return FALSE, and Get L a st E rro r will return E R ROR_HAN D L E_ E O F Finally, the thread that initiates an asynchronous I / O must not exit before that I / O completes Doing so will possibly prevent the completion

from ever being seen b y your program I t i s possible t o dynamically query whether the current thread has I / O pending

The function takes a HAN D L E to the thread to inquire about and returns T R U E in I p I O I s P e n d i n g if there are outstanding asynchronous I / O requests on the thread By exiting before pending I / O completes, some I / O packets would be lost completely This might subsequently impact the application code because some I / O completion events would never happen In addition, this can lead to memory leaks because it's commonplace for associated resources, such as buffers and OVE R LAP P E D data structures, to be freed in the I / O completion routines Ensuring threads don' t exit before pending I/O is completed can be somewhat difficult, especially for ordinary threads that are not under the control of low-level asynchronous APls Compo nents that manage threads, such as the CLR and Win32 thread pools, ensure that threads do not exit prior to all asynchronous I / O finishing

Critical sections support recursive acquires That is to say, if the current thread holds the section when E nt e r C r it i c a l Se c t i o n is called, an internal recursion counter is incremented and the acquisition immediately succeeds When LeaveC r i t i c a lSection is subsequently called, the recursion counter is decremented by 1; only when this counter reaches 0 is the section actually exited, made available to other threads, and any waiting threads awakened Recursion is possible because the critical section tracks ownership informa tion, enabling it to determine whether the calling thread is the current owner While recursion may seem like a generally convenient feature, it does come with some unique challenges because it is very easy to accidentally recur sively acquire a lock and depend (incorrectly) on certain state invariants holding We review this issue more in 1 1 , Concurrency Hazards

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