在执行python过程中，可能出现某个函数卡死的情况，通常的处理方法是手工终止程序运行。那如何能让脚本自动处理呢？网上有很多用signal库处理的例子，但signal只能在linux下使用，在windows下无法使用。在windows下可以使用另外一个方法KThread，Kthread继承了threading.Thread类并实现了kill方法。下面是整理的处理方法和调用方法。
一、方法
class KThread(threading.Thread):
"""A subclass of threading.Thread, with a kill() method.
Come from: Kill a thread in Python:
http://mail.python.org/pipermail/python-list/2004-May/260937.html
"""
def __init__(self, *args, **kwargs):
threading.Thread.__init__(self, *args, **kwargs)
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
class Timeout(Exception):
"""function run timeout"""
def timeout(seconds):
"""超时装饰器，指定超时时间
若被装饰的方法在指定的时间内未返回，则抛出Timeout异常"""
def timeout_decorator(func):
"""真正的装饰器"""
def _new_func(oldfunc, result, oldfunc_args, oldfunc_kwargs):
result.append(oldfunc(*oldfunc_args, **oldfunc_kwargs))
def _(*args, **kwargs):
result = []
new_kwargs = { # create new args for _new_func, because we want to get the func return val to result list
'oldfunc': func,
'result': result,
'oldfunc_args': args,
'oldfunc_kwargs': kwargs
}
thd = KThread(target=_new_func, args=(), kwargs=new_kwargs)
thd.start()
thd.join(seconds)
alive = thd.isAlive()
thd.kill() # kill the child thread
if alive:
# raise Timeout(u'function run too long, timeout %d seconds.' % seconds)
try:
raise Timeout('function run too long, timeout {0} seconds.'.format(seconds))
finally:
module_logger.warning('function run too long, timeout {0} seconds.'.format(seconds))
return 'Error', 'function run too long, timeout {0} seconds.'.format(seconds)
else:
return result[0]
_.__name__ = func.__name__
_.__doc__ = func.__doc__
return _
return timeout_decorator
二、使用装饰器调用实例
@testenv.timeout(60)
defmove_to_element_by_actionchains(se_driver,el,obj_attr,style):
