I've heard various people make the claim that using __thread variables is
*much* faster than pthread_get/setspecific(). However, when I look at the code
emitted as well as the implementation of the get/setspecific api, it appears to
me that _thread variables might be somewhat faster in binaries but actually
might be slower in shared libraries.
Does anyone have any fine grained experience that would help in determining
the tradeoffs involved? Thanks
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