DWORD WINAPI Tl sAl loc ( ) j in VS .NET

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All TLS slots are initialized when a thread is created, so all slots will initially contain the value N U L L The index itself should be treated as an opaque value, much like a HAND L E Each thread in the process uses this same index value to access the same TLS slot, meaning that the value is typically shared in some static or global variable that all threads can access If T l sA l l o c returns T L S_OUT_O F _I N D E X E S, the allocation of the TLS slot failed The per thread array of TLS slots is limited in number (64 in Windows NT, 95; 80 in Windows 98; and 1 ,088 in Windows 2000 and beyond, according to MSDN and empirical results) If too many components in a process are fighting to create large numbers of slots, this error can result In practice, this seldom arises, but the error condition needs to be handled Once a TLS slot has been allocated, the T l s SetVa l u e and T l sGetVa l u e functions can b e used t o set and retrieve data from the slots, respectively
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BOO l WINAPI T l sSetVa l u e ( DWORD dwT l s l n d e x , l PVOID IpTlsVa l ue ) j l PVOI D WI NAP I Tl sGetVa l u e ( DWORD dwT l s l ndex ) j
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Note that the TLS slot dwTl s I n d e x isn' t validated at all, other than ensuring it falls within the range of available slots mentioned above
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(ie, so that an out-of-bounds array access doesn' t result) This means that, due to programming error, you can accidentally index into a garbage slot and the as will permit you to do so, leading to unexpected results In the case where you provide a dwT l s I n d e x value outside of the legal range (eg, less than or greater than 1 ,087 on Windows 2000), T l s S et Va l u e returns F A L S E and T l s GetVa l u e returns N U L L Get L a s t E r ro r in both cases will return E R ROR_I NVA L I D_PARAM E T E R (87) Note that NU L L is a legal value to store inside a slot, which can be easily confused with an error condition; T l s GetVa l u e indicates the lack of error by setting the last error to E R ROR_SUCC E S S Last, you must free a TLS slot when it's n o longer i n use If this step is forgotten, other components trying to allocate new slots will be unable to re-use the slot, which is effectively a resource leak and can result in an increase in T LS_OUT_O F _IND E X E S errors Freeing a slot is done with the Tl s F ree function
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BOOl WINAPI T l s F re e ( DWORD dwT l s l n d e x ) j
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This function returns F A L S E if the slot specified by dwT l s I n d e x is invalid, and TRUE otherwise Note that freeing a TLS slot zeroes out the slot memory and simply makes the index available for subsequent calls to T l sAl l o c If the L PVOI D value stored in the slot is a pointer to some block of memory, the memory must be explicitly freed before freeing the index As soon as the TLS slot is free, the index is no longer safe to use-the slot can be handed out immediately to any other threads attempting to allocate slots concur rently, even before the call to T l sAl l o c returns, in fact It's common to use Dl lMa i n to perform much of the aforementioned TLS management functions, at least when you're writing a DLL For example, you can call T l sAl l o c inside D L L_PROC E S S_ATTACH, initialize the slot's con tents for each thread inside D L L_TH R E AD_ATTACH, free the slot's contents dur ing D L L_TH R E AD_D E TACH, and call T l s F ree inside of D L L_P ROC E S S_D E TACH For instance:
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# i n c l u d e <windows h > DWORD g_dwMyTl s l n d e x j II K e e p index in global or s t a t i c v a r i a b l e BOO l WINAPI DllMa i n ( H INSTANCE h i n st D l l , DWORD fdwRe a s o n , l PVOI D l p v R e s e rved )
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