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using an Eve ntWa itH a n d l e or Mo n it o r Wa i t / P u l s e / P u l s eAl l, for example, you typically need to double-check that the state is in the expected condition when waking, and you probably need to do it under the proper data synchronization For example:
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void Put ( T obj )
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l o c k ( myLoc k ) { myQue u e E n q u e u e ( obj ) j Monito r P u l seAl l ( my Loc k ) j }
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} T Get ( ) { loc k ( my Loc k ) wh i l e ( myQue u e Count e) Mon itor Wait ( my L oc k ) ; ret u r n myQueue Dequeue ( ) ;
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Notice that Get loops around testing if the queue is empty and waits when it is If this were a simple if-check, there would be horren dous race condition Another thread may take the element from the queue before the awakened thread wakes up and reacquires the lock; the result is that the queue is empty by the time the thread reaches 52 The call to myQu e u e Deq u e u e will likely throw an exception in response Fixing this is generally easier with condition variables because they combine control and data synchronization Raw events are more error prone because the lock must be separately managed
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21 Don't write code that depends on the OS thread 10 or HANDLE Use Th read C u r rent or Th read C u r rent ManagedTh readld instead When code depends on the identity of the actual 05 thread, the logi cal task running that code is bound to the thread This leads to thread affinity problems as mentioned earlier If running on a system where threads are migrated between 05 threads using some form of
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user-mode scheduling this can break if user-mode switches happen at certain points in the code Library code should strive to be maxi mally flexible and specifically not get in the way of such things Be on the lookout: many Win32 and Framework APls may imply thread affinity when used GUI APls typically require that they are called from a thread that owns the message queue for the GUI ele ment in question Historically, some Microsoft components like the Shell, MSHTMLDLL, and Office COM APls have also abused this practice The situation on the server is much better, but still isn' t per fect Some APls we design with the client in mind end up being used on the server, often with less than desirable results 22 Mark regions of code that do depend on the OS thread identity with Th read BeginThreadAffini ty / E ndTh readAffini ty The corollary to the previous rule is that if you must have code that depends on the OS identity, you must tell the CLR (and potential host) about it That's what the T h r e a d Beg i nTh r e a dAffi n i ty and E n dTh rea dAff i n i ty methods do Demarking and entering such a region halts OS thread migration altogether This is unfortunate, but at least code will remain robust 23 Always access TLS through the NET Framework mechanisms: Th readSt a t icAtt ribute or T h read GetData/SetData and related members The implementation of these APls abstract away the dependency on the OS thread allowing you to store state associated with the logical piece of work Although they sound thread specific, these store state based on whatever user-mode scheduling mechanism is being used, and, therefore, you don' t take thread affinity when you use them 24 Always access the security/impersonation tokens or locale infor mation through the Th read obj ect As with the previous item, the CLR abstracts away the storage of this information on the Th re ad object, via the Th re a d C u r rentCu l
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