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rwl Down g r a d e F romW r it e r Loc k ( ref u c ) ;
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You don' t always have to retry the whole operation if a writer sneaks in during an upgrade, but it's usually necessary in order to preserve atomic ity This is one of the biggest problems with the upgrade feature of the old R e a d e rw r i t e r L o c k : deciding whether atomicity is compromised by this behavior is a tricky and error prone process
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There is minimal 50S support for legacy RWLs The 50S ! T h r e a d s com mand has a Lock Count column in which the number of locks currently held by the thread is displayed This number also takes into consideration RWL shared and exclusive lock ownership Unlike CLR monitors, where the count excludes recursive acquisitions, the count does in fact include recursive RWL acquisitions If you need to get specific information about what threads currently own the RWL, short of spelunking in CLR internal data structures, there isn' t much you can do If you are inspecting the RWL from the thread that owns either a read of the write lock, the public I S Re ad e r Loc kHeld and I SW r i t e r
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not on the holding thread, the RWL has a private field _dwW r i t e r I D that con tains the managed thread ID of the current writing thread This is the best you can do Lock reader information is hidden completely, managed by the
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Now that we've looked at the data synchronization mechanisms on the platform, let's turn to those that are meant for control synchronization This includes Windows Vista and CLR condition variables These facilities, along with Windows events, are powerful enough to accommodate just about any control synchronization scenario you will encounter
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Windows Vista Condition Variables Condition variables codify a very common control synchronization pattern A thread often needs to wait for the establishment of some program specific condition Verifying that this condition has been met involves evaluating a predicate, which in turn involves reading shared state Because shared state is involved, it's important to use data synchronization Moreover, if the condition has not yet been established, other threads will need to use data synchronization to ensure they safely modify state associated with the condition under evaluation There's a race condition inherent in exiting a critical region associated with data synchronization and waiting for the occurrence of an event As we saw in the last chapter, Windows provides the S i g n a lObj e ctAndWa it API to signal an object and wait on another atomically for these very cases But as soon as you use a critical section or SRWL, you can't access this fea ture because the synchronization mechanisms are hidden, that is, you can not "release" the lock by signaling a kernel object; the user-mode lock itself controls all of this That's where the new Windows Vista condition variable feature comes in handy It integrates with both critical sections and SRWLs to enable wait ing and signaling on a logical condition variable related to a particular lock As with critical sections, condition variables are local to a process and, as with SRWLs, they are extremely lightweight: each one is the size of a pointer, and uses keyed events as the sole waiting and signaling mecha nism, meaning no allocation of separate kernel event objects is required
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