ikpdb.py 文件源码

def enable_tracing(self):
        """ Enable tracing if it is disabled and debugged program is running, 
        else do nothing.
        Do this on all threads but the debugger thread.
        :return: True if tracing has been enabled, False else.
        """
        _logger.x_debug("enable_tracing()")
        #self.dump_tracing_state("before enable_tracing()")
        if not self.tracing_enabled and self.execution_started:
            # Restore or set trace function on all existing frames appart from 
            # debugger
            threading.settrace(self._tracer)  # then enable on all threads to come
            for thr in threading.enumerate():
                if thr.ident != self.debugger_thread_ident:  # skip debugger thread
                    a_frame = sys._current_frames()[thr.ident]
                    while a_frame:
                        a_frame.f_trace = self._tracer
                        a_frame = a_frame.f_back
            iksettrace._set_trace_on(self._tracer, self.debugger_thread_ident)
            self.tracing_enabled = True

        #self.dump_tracing_state("after enable_tracing()")
        return self.tracing_enabled