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There are four main phases of this code First, we allocate the relevant OV E R LAP P E D structures, BYT E arrays into which data will be copied, and events that will be used to signal comple tion We also kick off the asynchronous I / O using R e a d F i le, similar to what has already been shown We accumulate a list of which operations actually turned into asynchronous I / O versus those that completed synchronously by placing the relevant I / O's event HAN D L E into the i n F l ightH a n d l e s array in the former case In the next phase, we loop through and, for each i n F l i ghtH a n d l e s entry that is NU L L, we can go ahead and process the I / O right away It completed synchronously The relevant information will have been stored into the byt e s [ i ] and byt e s Re a d [ i ] arrays during the call to R e a d F i l e We do something that might appear odd after this: we store the current thread's HAN D L E into the i n F l i ght H a n d l e s array where the NU L L used to be This is done because it will never become signaled (since the current thread would have to exit) This makes issuing a wait-any style wait a bit easier, which we use in the next phase In the third phase, we must wait for asynchronous I / O completions To do so, we loop through the i n F l ightHa n d l e s entries So long as we see at least one that isn't set to the current thread's HAN D L E (meaning it's already finished), we will do a wait-any style W a i t F o rM u l t i p l eOb j e c t s Once this awakens, we can translate the return into a specific I / O that has finished The byt e s [ ret ] and o l a p s [ ret ] entries will contain information that we can use to process the completion We then place the current thread's.

waits and restart the loop The fourth and final phase is just to delete the buffer memory and close the event handles

.

It is common for the payroll staff to be in charge of tracking the vacation and sick time used by employees This involves sending out forms for employees to fill out

11

Method #5: APC Callbacks A n alternative that makes the kind o f code we just saw simpler is to use APCs as a means to process I / O completions You saw that R e a d F i l e E x and W r it e F i l e E x from earlier allow you to pass a callback routine as a L POVE R LAP P E D_COMP L E TION_ROUT I N E As specified, this callback will be executed inside an APC on the thread that initiated the I /O This can be useful because APCs are generally high performance and don' t require that you allocate extra event kernel objects Compared to the four previous mechanisms, this is often the most efficient technique if you've decided not to use completion ports For the completion to be delivered when the I / O finishes, the initiat ing thread must be in an alertable wait state It's a good idea to ensure that the code initiating the I / O is also the code that intercepts the APCs This might seem obvious, but there are easy ways to make mistakes If you ini tiate some I / O and then either return control back to a caller, perhaps indi rectly due to an exception, or make a call into another API that internally performs an alertable wait, the I / O may finish somewhere else Strange results may arise For example, the wait might occur inside a lock or when some thread affine state has been introduced If an exception is thrown from the completion callback, unexpected results will surely occur The use of APC completion therefore is constrained to fairly closed scenarios, where code run in between initiating and completing the I / O is tightly controlled Here's a version of the wait-any style code shown above that uses APC completion instead.

VOID CAL L BAC K IoCmp ( DWORD dwE r rorCod e , DWORD dwNumbe rOfByt e s T r a n sfer red , LPOV E R LAPPED l pOve r l a p p e d )