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already equal to the current thread's 10; when E x i t is called, we decrement it and only switch m_s t a t e to e when the recursion counter also hits e
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T h r e a d Beg i n C r it i c a l Region and E n d C r it i c a l Region are used to
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notify CLR hosts that we're in a region of code which, if interrupted, could lead to system instability Since spin locks are used to protect important data and because an interrupt could lead to infinite spin ning in some threads, this is a must for any critical code We must ensure Beg i n C r i t i c a l Region has been called before a successful interlocked operation has marked the lock as being owned, and call E n d C r it i c a l Region when we know the current thread doesn't own the lock: either because of a failed interlocked operation or because the lock was released
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When contention is detected, we only attempt the interlocked operation on the shared flag once we have subsequently read it as e <the innermost d o - w h i l e loop) This reduces problematic contention caused by multiple processors acquiring a cache line in exclusive mode only to find that it doesn't contain the correct value There is a race between seeing it as e and writing, but at least this ensures contention happens only when the lock was observed as being truly available This is sometimes called a test and test and set (TATAS) lock When releasing the lock, we have a choice Do we use an interlocked operation for the write, or not The lock will remain correct if we do not-and will undoubtedly perform better-but this can lead to star vation because the "release" write may never leave a processor 's cache in time For example:
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If the thread loops around and tries to reacquire the lock very soon after it releases it, as in this example, it may be given immediate access This is unfair to other threads that may have been waiting for the lock for a much longer time In fact, it could lead to indefinite starvation if the thread never stops This is why we offer an Ex it method with a boolean parameter: when t ru e we use an interlocked operation to release the lock
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One feature whose omission may be surprising is timeouts You could build this by occasionally querying a counter (using Win32's QueryPe rforma n c eC o u n t e r or the NET Stopwatc h), but this is left as an exercise to the reader Because spin lock critical regions are meant to be very small, you should seldom need a timeout capability anyway
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A couple items are unimportant to C++ (first and fourth), but the others apply equally Another optional feature that would apply to NET only might be the ability to reliably acquire our spin lock type Recall from 6, Data and Control Synchronization, that managed threads can be aborted, and that the acquisition of CLR monitors via the language supported keywords ensures an abort can' t lead to an orphaned lock Wouldn't it be nice if we supported this too We can do so by adding a Re l i a b l e E nt e r method Everything else about the above implementation remains the same
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