Symptom: Adding indentation to log messages sometimes results in no indentation being added to incoming log messages. Environment: Fedora 13 Boost version: trunk (1.44 prior to beta release) Boost.Log version: 1.0 Compiler: GCC 4.4.4 Research: As I read the documentation I see that the Boost.Log talks about a non-empty log record is considered to be tied to the current thread. Since my program is single threaded I did not consider my initial attempt of using inline functions in a separate namespace with a namespace variable to keep track of indentation level to be a problem. My first attempt looked like: namespace project { namespace log { static boost::uint32_t indent_level = 0; #ifdef DEBUG #include #include /*! * \brief Record the entering of a function * \param function String name of the function being entered */ template <typename Function> inline void record_enter ( Function const& function ) { BOOST_LOG_TRIVIAL(trace) << std::string ( indent_level, ' ' ) << boost::str ( boost::format ( "(Enter) %1%" ) % function ); indent_level += 2; } /*! * \brief Record the exiting from a function * \param function String name of the function being exited */ template <typename Function> inline void record_exit ( Function const& function ) { BOOST_LOG_TRIVIAL(trace) << std::string ( indent_level, ' ' ) << boost::str ( boost::format ( "(Exit) %1%" ) % function ); indent_level -= 2; } /*! * \brief Record a message with one input * \param format_string String written in the Boost.Format style to be used to parse input * \param t1 Input value */ template inline void record_debug ( Format const& format_string, T1 const& t1 ) { BOOST_LOG_TRIVIAL(debug) << std::string ( indent_level, ' ' ) << boost::str ( boost::format ( format_string ) % t1 ); } #else template <typename Function> inline void record_enter ( Function const& ) {} template <typename Function> inline void record_exit ( Function const& ) {} template inline void record_debug ( Format const&, T1 const& ) {} } // namespace log } // namespace project #endif When I run the code I see that the indentation is tracking by steps of 2 as I go into functions and reduced by 2 as I exit. There are exceptions where the indentation is 0 for a few lines or so then resumes the correct level. The problem I think is that there are more than one thread handling what I send to Boost.Log via BOOST_LOG_TRIVIAL. It as if there is one thread that has the correct level and another thread that has indent_level set to 0. For example: 1 [2010-Aug-06 12:03:15.329757] [0x88bb070] [trace] (Enter) void Test::functionA() 2 [2010-Aug-06 12:03:15.330867] [0x88bb070] [debug] Function A: do something 3 [2010-Aug-06 12:03:15.330989] [0x88bb070] [trace] (Enter) double Value::CalcX() 4 [2010-Aug-06 12:03:15.331124] [0x88bb070] [debug] X: 5 5 [2010-Aug-06 12:03:15.331188] [0x88bb070] [debug] Y: 10 6 [2010-Aug-06 12:03:15.331252] [0x88bb070] [trace] (Enter) double Value::CalcX() My intial guess is that I have Boost.Log compiled multi-threaded and I have a single-threaded solution. Is there a way to track which thread was recording a message in Boost.Log? I would like to confirm Boost.Log is using different threads to handle my messages. Also is there a better way to do what I want? Stephen Stephen Torri, PhD NAVAL SURFACE WARFARE CENTER DAHLGREN 17214 Ave B Suite 121 Dahlgren, Va. 22448 540-653-7055 I am not a contracting officer. I cannot modify or initiate contracts, nor do I have the authority to financially commit the government in any way.