[boost] [threads] Unexpected behaviour of Thread loal storage

Hello, I would like to ask if there is everything ok with my way of thinking. I have 3 solutions (projects) in MS Visual Studio. Let say: SolutionA (static lib) SolutionB (linked with Solution A) SolutionC (linked with Solution A) In Header file of solutionA I have delaration of TLS from boost static boost::thread_specific_ptr<int> TLS; And now in SolutionB I set tls (TLS.reset(uVariable)) - uVariable is integer 2 Call function from SolutionC and call TLS.get() but there is different value than 2. But when i return from function to SolutionB and call TLS.get there is everything ok (return 2). It's ok ? Why in solutionC there is no visibilty of value set in solutionB ? It's the same thread (with the same threadId). Best regards