Add TLS (thread-local storage) tutorial #2
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Add tls/ folder. __thread.c highlights the use of implicit TLS, i.e. via the `__thread` storage class keyword. tsd.c uses explicit TLS, i.e. via `pthread_setspecific()` / `pthread_getspecific` function calls.
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This is a tutorial on using TLS (thread-local storage) and on TLS internals.