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All Vista pools begin life with no threads, including the process-wide default thread pool As work is queued, additional threads are intro duced as quickly as needed to execute work items until the goal of hav ing the same number of threads as processors is reached Once this goal has been reached, subsequent thread creation is throttled I / O comple tion ports are used to communicate work to these threads and to block them Namely, if one of the thread pool threads has been blocked for longer than 10 milliseconds, causing the active threads to drop below the processor count, and the queue is nonempty, a new thread will be created automatically to execute the work The decision about when to introduce new threads is made anytime new work is enqueued, in addition to various other points throughout the thread pool's implementation Throttling at 10 milliseconds instead of instantaneously introducing more threads as soon as a blocked thread is witnessed helps to avoid creat ing too many threads when work blocks for very short periods of time This kind of short blocking happens frequently in many systems, due to things like page faulting and momentary waits for contended resources, like locks Threads are destroyed automatically after they have been idle for 10 sec onds without having any work to perform, no matter whether this brings the thread count below the number of processors or not Obviously the thread count won' t drop below the pool's minimum, if one has been specified with SetTh r e a d pool Th r e a d M i n imum Similarly, the thread count won' t exceed the maximum, if specified by a call to Set T h r e a d pool Th readMaximum (or the default of 500) As we'll see in 1 5, Input and Output, each I/O completion port has a concurrency level representing the desired number of actively run ning threads processing completion packets from the port When worker threads aren't executing callbacks, they are waiting on the I / O completion port Windows will do its best to ensure the number of runnable threads processing work from the port stays as close to the concurrency level as possible, done in part by integration with the OS blocking primitives Each pool's concurrency level is set to the number of processors on the machine So even if the pool introduces more threads than processors (because of the conditions noted above), that doesn't mean all of them will continue run ning For example, imagine there are P threads, where P is the number of.

.

processors, and the thread pool creates another because one of those threads was blocked for 1 0 milliseconds; immediately after this, the thread unblocks; now we have P + 1 running threads; the next thread to go back to the completion port, assuming none of them subsequently block again, will not be given any work to do because the port knows that the desired concurrency level has already been reached In low resource conditions, the thread pool may not be able to create enough worker threads to perform all of the work in the queue The pool will keep trying to introduce threads after such failures, with a delay of 10 seconds in between each attempt, until it succeeds Thread pool threads are created with the default stack reserve / commit information from the PE file There is no way to override this If you need threads with very large stacks, you will have to resort to manual thread management using C reateTh read, and so forth, or by changing the PE file's default stack sizes, as discussed in s 3 and 4 The thread pool's heuristics are very effective for most cases In some circumstances, however, it may be necessary for work on the pool to take an extraordinarily long time to complete In these cases, you run the risk of starving other work that is waiting to be serviced in the pool, even though the callback may not necessarily block or do something to trigger the pool to create more threads (As an aside, the thread pool is not well suited for this You should try, to the best of your ability, to marshal any long running work such as this to a dedicated thread instead of tying up one of the thread pools) Long running callbacks should notify the thread pool via the C a l l b a c kMa y R u n L o n g function This tells the thread pool to allocate a new thread in to process other work When the work item completes, the thread pool is told that it can safely destroy this extra thread You can also notify the thread pool that an entire group of work associated with a par ticular environment is expected to run long with the SetTh r e a d pool C a l l b a c k R u n L o ng API.

x P(X = x),

$0 $110 $356 $1,254 $2,747 $6,050 $13,069

BOOL WINAPI C a l l b a c kMayR u n Long ( PTP_CAL L BAC K_INSTAN C E p c i ) ; VOID SetThreadpoolC a l l b a c k R u n s Long ( PTP_CAL L BAC K_ENVI RON p c be ) ;

The C a l l b a c kMay Run Long function returns TRUE if the thread pool was able to either free up another thread to process work or create an entirely new

thread, and FALS E otherwise A return value of FALSE doesn't necessarily mean the thread pool won't subsequently introduce work based on its ordi nary heuristics This API should be viewed as a hint, and, thus, the return value isn't tremendously valuable SetTh read poo lCa l l b a c k R u n s Long pro vides no indication of whether it could free up a thread or not

but it is shown here since it can be used with any discrete probability distribution, usually providing a derivation easier than the direct calculation

0% 10% 15% 27% 30% 35% 386%

There are a whole bunch of completion tasks that can be associated with a thread pool callback All of them are similar in that they will execute after the callback is finished but before returning the thread back to the pool These simplify various synchronization sensitive, but fairly common, activ ities upon callback completion: