Robot Framework 代码18之stoppablethread.py

import sys
import threading


class StoppablePythonThread(threading.Thread):

    """A subclass of threading.Thread, with a stop() method.
    
    Original version posted by Connelly Barnes to python-list and available at
   
   
    This version mainly has kill() changed to stop() to match java.lang.Thread.
   
    This is a hack but seems to be the best way the get this done. Only used
    in Python because in Jython we can use java.lang.Thread.
    """

    def __init__(self, *args, **kwargs):
        threading.Thread.__init__(self, *args, **kwargs)
        self._stopped = False

    def start(self):
        """Start the thread."""
        self.__run_backup = self.run
        self.run = self.__run      # Force the Thread to install our trace.
        threading.Thread.start(self)

    def stop(self):
        self._stopped = True

    def __run(self):
        """Hacked run function, which installs the trace."""
        sys.settrace(self._globaltrace)
        self.__run_backup()
        self.run = self.__run_backup

    def _globaltrace(self, frame, why, arg):
        if why == 'call':
            return self._localtrace
        else:
            return None

    def _localtrace(self, frame, why, arg):
        if self._stopped:
            if why == 'line':
                raise SystemExit()
        return self._localtrace

文件路径：C:\Python26\lib\site-packages\robot\stoppablethread.py
功能：用于python平台上停止线程，使用的地方不多，暂不深入。