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Many uses of XCHG are used to swing a single bit between 0 and 1 , as shown in the previous example of a spin lock For this purpose, a special family of bit-test instructions is offered by many, but not all, processors: X86 and X64 offer them, but IA64 does not There are two variants: bit-test-and-set and bit-test-and-reset, whose instructions are BTS and BTR, respectively As the names imply, they enable you to test a single bit in a destination memory location and change its value: to on (in the case of a bit-test-and-set) or off (in the case of bit-test-and-reset) When prefixed with LOCK, these instruc tions execute atomically The bit operations are not available in NET, but are in Win32
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BOO L EAN WI NAP I Interloc kedBitTe stAndSet ( LONG volat i l e * B a s e , LONG B i t BOO LEAN WINAPI I n t e r l o c k e d BitTe stAndSet64 ( LONG LONG volat i l e * B a s e , LONG LONG Bit BOOL EAN WINAPI I nt e r l o c k e d B itTestAn d R e set ( LONG volat i l e * B a s e , LONG B i t BOO L EAN WI NAP I I nt e r l o c k e d B itTestAn d R e s et64 ( LONG LONG volat i l e * B a s e , LONG LONG Bit
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Each takes a pointer to the location that will be modified, and the index of the bit to test and modify Notice that the bit argument is not a mask: it's the bit' s index itself The return value will be T R U E if the bit was found to be on before modification, and F A L S E otherwise No matter the return value, the bit will have been changed by the instruction On processors that support it, any calls to these functions will be compiled into an intrin sic; otherwise the CMPXCHG instruction will be used to emulate the calls As an example of the bit-test-and-set instruction, let's return to the spin lock example from earlier This time we'll write it in C++:
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class Spin Lock { volat i l e LONG m_stat e ; public : void E n t e r ( ) { while ( I nt e rloc kedB itTe stAndset ( &m_stat e , a } void Exi t o { } }; /* spin* / ;
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The only difference here is that we use I nt e r l o c k e d B itTe stAn d S et in the loop We continue looping until it returns F A L S E , meaning we witnessed the bit in the off position Any algorithm that uses these functions could have been instead used XCHG; so why would we care about having both Bit-test-and-set and -reset are slightly more efficient than a XCHG operation If all you need to do is set or clear a single bit (and you're writing code in C++ and), you should pre fer using one of them instead
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There are a few other useful interlocked operations to accommodate common update patterns Each of them could be implemented using an
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ordinary C A S operation, but are more efficiently done completely in hardware This includes:
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An XADD instruction, enabling you to atomically add a particular value to a numeric location (when prefixed with LOCK ) This capa bility is exposed to Win32 with the I n t e r lo c k edAdd and I n te r loc kedAd d 64 functions and NET with the I n t 3 2 and I n t 64 overloads of I n t e r loc ked Ad d
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When prefixed with a LOCK, the I N C , D E C , NOT, and N E G single operand logical instructions are carried out atomically The first two are exposed to Win32 with the I n t e r l o c k ed I n c reme n t , I n t e r
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l o c k e d I n c reme n t 6 4 , I n t e r l o c k e d D e c rement, and I nt e r l o c ked D e c reme n t 64 functions, and to NET with the I n t e r l o c ked I n c rement and I n t e r l o c k e d Dec rement static methods, both of
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