Miscellany

class KThread(threading.Thread):
"""A subclass of threading.Thread, with a kill()
method."""
def __init__(self, *args, **keywords):
threading.Thread.__init__(self, *args, **keywords)
self.killed = 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 __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.killed:
if why == 'line':
raise SystemExit()
return self.localtrace

def kill(self):
self.killed = True