Function start_thread

extern/boost/boost/thread/detail/thread.hpp:180–186

        bool start_thread_noexcept();
        bool start_thread_noexcept(const attributes& attr);
        void start_thread()
        {
          if (!start_thread_noexcept())
          {
            boost::throw_exception(thread_resource_error());
          }
        }
        void start_thread(const attributes& attr)
        {
          if (!start_thread_noexcept(attr))