[boost] [thread] Documentaion and implementation incoherences

Hi, Only some comments and questions. * mutex native_handle_type and native_handle() are missing in the doc Should these be defined for timed_mutex, recursive_mutex, ...? * The documentation do not includes a rationale. Could you adapt the rationale from Howard E. Hinnant Mutex, Lock, Condition Variable Rationale http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2007/n2406.html#Introduct..., or at least add reference to this document in the rationale? Best ____________________ Vicente Juan Botet Escriba