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suspends a managed thread, that thread will be in a suspended mode but its state will not report back S u s pended if queried Similarly, if a P I Invoke into a native API ends up blocking the calling thread on a native synchronization object, the CLR will not know to update the managed thread's state to Wai t SleepJ o i n and therefore it will incorrectly report back R u n n i n g as its state
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Priorities Because thread priorities are so fundamental to how the Windows thread scheduler works, it's important to understand them It's particularly impor tant to understand them, because only then will you appreciate why you should avoid using them under most circumstances Priorities are not as sim ple as you might at first imagine because the priority, from the scheduler's standpoint, is comprised of two components: the process's priority class and the individual thread's relative priority These things taken together form a numeric priority level, which falls in the range of 1 to 31 , inclusive Higher levels indicate higher priorities Process priority classes are fur thermore organized into so-called dynamic 0 -1 5) and real-time 0 6-31 ) ranges There is only a single class within the real-time range, but there are several within the dynamic range Each class has a default level within the range which threads will, by default, get assigned; however, relative prior ities can be set on individual threads to add or subtract an offset from this default In Win32, a process's priority class can be set via S et P r i o r ityC l a s s or retrieved via Get P r io r ityC l a s s Each of these functions takes a HAN D L E to the target process
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BOOl WINAPI Set P riorityC la s s ( HAND l E h P roc e s s , DWORD dwP r iorityC l a s s ) ; DWORD WINAPI Get PriorityC la s s ( HAND l E hProce s s ) ;
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In the NET Framework, you can change a process's priority class with the System D i a g n o s t i c s P r o c e s s class; this type offers a P r i o r i tyC l a s s property, which accepts a value o f the enum type P r o c e s s P r i o r i tyC l a s s
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p u b l i c c l a s s Proc e s s { p u b l i c Proc e s s PriorityC l a s s PriorityC l a s s { get ; set ; }
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Table 41 lists all o f the priority classes along with their constants and levels:
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TABLE 4 1 : Windows priority c lasses and Win 3 2 and N ET e n u m values Title Win 3 2 Constant Va lue N ET E n u m Value
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Each thread may furthermore be assigned a relative priority In Win32, a thread's priority may be set with SetTh r e a d P r ior ity and similarly can be retrieved with GetTh r e a d P r i o rity
BOOl WINAPI SetThreadPriority ( HAND l E hThrea d , int n P r iority ) ; int WINAPI GetTh readPriority ( HAND l E hThread ) ;
And in the NET Framework, the managed thread class, System Th read i n g Th read, offers a P r i o r ity property that accepts values of the enum type