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htttp://lists.mysql.com/commits/50957?f=plain Always use TLS functions instead of __declspec(thread) to access thread local storage variables. The change removes the necessity to recomplile the same source files twice - with USE_TLS for DLLs and without USE_TLS for EXEs. Real benefit of this change is better readability and maintainability of TLS functions within MySQL. There is a performance loss using TlsXXX functions compared to __declspec but the difference is negligible in practice. In a sysbench-like benchmark I ran with with TlsGetValue, pthread_[get|set]_specific was called 600000000 times and took 0.17sec of total 35min CPU time, or 0.008%.