Function condition_error

extern/boost/boost/thread/exceptions.hpp:79–82

          : base_type(system::error_code(0, system::generic_category()), "Condition error")
          {}
          condition_error( int ev )
          : base_type(system::error_code(ev, system::generic_category()), "Condition error")
          {
          }
          condition_error( int ev, const char * what_arg )
          : base_type(system::error_code(ev, system::generic_category()), what_arg)
          {