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causes the work to get queued to an ordinary worker thread All waiting on this thread is done with an I / O completion port, which means that waits are nonalertable and, thus, no APCs are able to run Additionally, these threads do not check for outstanding I/O before exiting If you exit a thread before the asynchronous I / O, it initiated has completed, the I / O request will be canceled; if you begin asynchronous I/O on such a thread, you will be disappointed
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WT_EXECUT E I N IOTH R E AD ( ex l ) : This flag ensures that the thread on
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which the callback runs will not exit before asynchronous I / O requests o r APCs that were begun o n i t have completed This ensures that it's safe to initiate asynchronous I / O operations from the thread pool The queuing of this work is done with an APC That
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means that if any work running on an I/O thread performs an alertable wait, it may result in dispatching a work item that has been queued to an I / O thread This can cause reentrancy problems, so you must take care to ensure that thread-wide state is consistent whenever an alertable wait is issued on such a thread The Vista thread pool now treats all callback threads as I / O threads, in the sense that it won't exit before all initiated asynchronous I / O has finished
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WT_EXE CUT E I N P E RS I ST E NTTH R EAD ( exSe ) : As mentioned earlier, a
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small number of Win32 APIs requires that a thread stay around "forever" after the API has been called on that particular thread RegNot i fyC h a nge KeyVa l u e is one such routine Specifying this flag ensures that the callback runs on a thread that won't go away and therefore enables you to use such APIs This is implemented pre Vista by running the work on the default timer queue' s thread As we will see, running code on this thread is dangerous because it can delay timer expirations So if you need to use this option, first reconsider it and then proceed with great care On Vista, at least, this causes work to run on a hidden dedicated single-threaded pool There are two other flags that are orthogonal
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WT_EXECUTE LONG F UNCTION ( exle ) : This, much like the Windows
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Vista thread pool's C a l l b a c kMayR u n Lo n g API, instructs the pool that the work about to run may take a long time The thread pool responds by dedicating more threads than it would have otherwise thrown at the pool This translates to one additional thread for each work item queued with this flag
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Windows XP SP2 (client) and Windows Server 2003 (server), causes the QueueU s e rWo r k Item routine to capture the calling thread's imper sonation token and to propagate it to the thread pool thread for the duration of the callback Normally, when this flag isn' t set, the process identity token is used instead and the impersonation token from the queuing thread is ignored
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After calling this function, the work has been queued to a work queue and will execute as soon as threads are available Qu e u e U s e rWo r k ltem can fail because it must allocate memory, in which case it returns F A L S E , and Get L a s t E r r o r will return details about the failure
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The legacy thread pool's timer facilities allow you to group many timers together into something called a timer queue A timer queue is a logical grouping of related timers that can be managed and deleted at once and provides some level of isolation between timers so that one group can be serviced and can expire without affecting another The thread pool associ ates a single timer thread with each timer queue that has been created There is also a single default timer queue that your program can use if you don't want to group them together Individual timers are associated with a particular timer queue, which is what specifies the callback and expira tion information including whether the timer is a one-shot or recurring timer Before creating individual timers, we can create a timer queue
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