W i n d ows T h re a d Pools in .NET

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The feature described by the first bullet is possible because you can create separate pool objects, and the second and third both depend on a separate thing called a cleanup group Before doing any of this, however, you need to first initialize an environment object with the I n it i a l i zeTh readpool E n v i ronment function Unlike the creation APIs we've seen earlier, this function doesn't dynamically allocate the object-you pass a pointer to a memory loca tion and it will initialize its contents The environment must be destroyed later with De st royThreadpoo l E n v i ronment
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VOI D I n it i a l i zeThreadpoo l E n v i ronment ( PTP_CAL L BAC K_ENVI RON p c be ) ; VOI D DestroyThread pool Envi ronment ( PTP_CAL L BAC K_ENVI RON p c be ) ;
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Each takes a pointer to a TP _CA L L BACK_E NVI RON block of memory and initializes or destroys the target memory's contents, respectively
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Creating Isolated, Dedicated Pools Each process has one default Vista thread pool inside of it Any work created with a N U L L argument for the call back environment, as shown earlier, will go into this default pool's process wide shared queue and will be serviced by a process-wide shared set of threads This sharing applies within all processes, including those that host many in-process components (such as svchostexe) The fact that this inti mate level of sharing happens can cause problems for some components, particularly because some may queue work at an uneven rate For example, one "chatty" component that queues many small work items can starve another component that queues work less frequently and in coarser chunks Because the queue is serviced in FIFO order, this isn't always an issue; but the mere possibility that unpredictable wait times may occur is enough to concern many developers As of Vista, you can now create multiple pools inside the same process Each pool has its own work queue and manages its own set of worker threads This allows you to isolate components from one another so that the normal Windows preemptive scheduling can create some sort of fairness and can deal with possible starvation, albeit at the cost of hav ing more threads in the system and possibly incurring more context switches The thread pool thread creation and retirement policies do not change at all when you have multiple pools in the same process; in other words, they are unaware of each other, and each will be greedy and try
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to use as many processors as possible This can certainly cause perform ance anomalies, but the benefits from being able to isolate components from one another sometimes outweigh this risk To create a new pool, call the C reateTh r e a d pool function
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PTP_POOL WINAPI C reateThread pool ( PVOID reserved ) ;
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After creating the pool, you will need to associate it with a callback environment
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VOI D SetThread pool C a l l b a c k Pool ( PTP_CA L L BAC K_ENVI RON p c b e , PTP_POOL p t p p );
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After making this call, all subsequent work items that are scheduled for execution through the specified callback environment p c b e will execute in the new pool As with the other thread pool objects we've looked at so far, you also need to free the object when it's no longer in use This is done with the C l o s eTh r e a d pool function
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VOI D WINAPI C loseThread pool ( PTP_POO L p t p p ) ;
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If there is work actively executing in the target thread pool, freeing will take place after all of the work completes If there are work items in the pool that have not yet been scheduled for execution, they are canceled and will never execute Once you have a separate thread pool object, you can also set sepa rate minimum and maximum thread counts on it We' ll describe the ordinary default thread creation and deletion policies later, but the min imum is the smallest number of active threads the thread pool will keep on hand, and the maximum is the most it will create to service work The default minimum is 0 and the default maximum is 500 (The value of 500 was chosen for legacy compatibility with the pre-Vista thread pool infra structure For machines with more than 500 processors, this is a poor default, but at the time of this writing, such machines are not yet commonplace ) You can change these for a custom thread pool with the S e t T h r e a d p oo l T h r e a d M i n i m u m and S e t T h r e a d p o o l T h r e a d M a x i m u m functions
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