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How to use join_bg_jobs method in autotest

Best Python code snippet using autotest_python

ftrace.py

Source:ftrace.py

...87        while (self.record_job.sp.poll() is None and88               utils.read_file(tracing_on).strip() != '1'):89            time.sleep(0.1)90        if self.record_job.sp.poll() is not None:91            utils.join_bg_jobs([self.record_job])92            raise error.CmdError(self.record_job.command,93                                 self.record_job.sp.returncode,94                                 'trace-cmd exited early.')95    def stop(self, test):96        """97        Stop ftrace profiler.98        :param test: Autotest test in which the profiler will operate on.99        """100        os.kill(self.record_job.sp.pid, signal.SIGINT)101        utils.join_bg_jobs([self.record_job])102        # shrink the buffer to free memory.103        utils.system('%s reset -b 1' % self.trace_cmd)104        # compress output105        utils.system('bzip2 %s' % self.output)106        compressed_output = self.output + '.bz2'107        # if the compressed trace file is large (10MB), just delete it.108        compressed_output_size = os.path.getsize(compressed_output)109        if compressed_output_size > 10 * 1024 * 1024:110            logging.warn('Deleting large trace file %s (%d bytes)',111                         compressed_output, compressed_output_size)112            os.remove(compressed_output)113        # remove per-cpu files in case trace-cmd died....

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