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Spin Lock Building a proper spin lock isn't as straightforward as you'd assume, as we saw in 1 4, Performance and Scalability But for leaf-level locks that are meant to be held for very short periods of time, experience low degrees of contention, and where you'd like to minimize overhead and resource usage impact, they can be quite useful Parallel Extensions includes a System T h r e a d i n g S p i n Loc k type that can be used for such circumstances
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p u b l i c struct S p i n Lo c k { II C o n s t r u c t o r s p u b l i c S p i n Loc k ( ) ; p u b l i c S p i n Loc k ( bool e n a b leTh readOwnerTra c k i ng ) ;
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II Method s p u b l i c void p u b l i c bool p u b l i c bool p u b l i c bool p u b l i c void p u b l i c void
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E n te r ( ref bool t a k e n ) ; T r y E nt e r ( ref bool t a k en ) ; T ry E nt e r ( TimeSpan t imeout , ref bool t a k e n ) ; Try E nt e r ( int t imeoutMi l l i second s , ref bool t a k en ) ; E x it ( ) ; E x i t ( bool u s eMemo ryBa r r i e r ) ;
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I I Propert i e s p u b l i c bool I sH e l d { get ; } p u b l i c bool I sH e l d By C u r rentThread { get ; } p u b l i c bool I sTh readOwn erTra c k i n g E n a b led { get ; } }
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Notice that S p i n Loc k is a value type Its size is 4 bytes total, but you'll need to be very careful that you don't copy it around, since the copies won't enjoy mutual exclusion with respect to one another Using it is probably rel atively obvious: E n t e r is used to acquire the lock (or T ry E nt e r if you'd like to use a timeout), which spins until available if it's taken, and E x i t is used to release the lock You might wonder why every overload accepts a ref bool t a k e n argument This is to enable their use in reliable situations, where asynchronous exceptions might otherwise lead to orphaned locks The regular pattern of usage is:
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Spin Lock slock bool w a s T a k e n t ry { s l oc k E nt e r ( ref wa s T a k e n ) ; I I C r i t i c a l region body } finally { s l oc k E x it ( ) ; }
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An overload of E x i t allows you to control if a full memory fence is used to release the lock This is t r u e by default, but does mean the cost of acquiring and releasing is two interlocked operations instead of one This is done to prevent subsequent code from moving inside the criti cal region If you know this cannot happen, or it is safe, you can pass
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