[英]Killing Thread and releasing memory in Python
我正在杀死这里显示的线程: 有没有办法在Python中杀死一个线程?
但是我注意到,内存没有被释放( gc.get_objects()
不断增长和增长)。 事实上,这些对象是列表,序列等,而不是文件。
我有什么方法可以手动释放资源吗? 码:
import ctypes
def terminate_thread(thread):
"""Terminates a python thread from another thread.
:param thread: a threading.Thread instance
"""
if not thread.isAlive():
return
exc = ctypes.py_object(SystemExit)
res = ctypes.pythonapi.PyThreadState_SetAsyncExc(
ctypes.c_long(thread.ident), exc)
if res == 0:
raise ValueError("nonexistent thread id")
elif res > 1:
# """if it returns a number greater than one, you're in trouble,
# and you should call it again with exc=NULL to revert the effect"""
ctypes.pythonapi.PyThreadState_SetAsyncExc(thread.ident, None)
raise SystemError("PyThreadState_SetAsyncExc failed")
class MyThread(threading.Thread):
def __init__(self):
threading.Thread.__init__(self)
self.result = None
self.error = None
def run(self):
try:
self.result = myfun(*args, **kw) #run external resource and the interrupt it
except Exception as e:
self.error = e
c = MyThread()
c.start()
c.join(60) # wait a minute
counter = 0
if c.isAlive():
while c.isAlive():
time.sleep(0.1)
try:
terminate_thread(c) # how to release resources?
except:
break
counter += 1
if counter > 10: break
raise TimeoutException
输出示例:
print('Controlled objects: %s' % len(gc.get_objects()))
print ('Unreachable: %s' % gc.collect())
Controlled objects: 85084 #request 1, no timeout
Unreachable: 5640
Controlled objects: 171994 # request 2, timeout
Unreachable: 7221
好吧,在所有这些垃圾之后,我认为你想要的是多处理模块,因为我相信你实际上可以发送一个sigkill
class MyThread:
def __init__(self):
self.result = None
self.error = None
def start(self):
self.proc = multiprocessing.Process(target=self.run)
self.proc.start()
def stop(self):
self.proc.send_signal(multiprocessing.SIG_KILL)
def run(self):
try:
self.result = myfun(*args, **kw) #run external resource and the interrupt it
except Exception as e:
self.error = e
然后你会调用c.stop()
来使用sig_kill来停止线程(粗略的,另一个应该对此做出适当的响应)
你甚至可以使用builtin subprocess.Process.kill()
(参见文档https://docs.python.org/2/library/subprocess.html#subprocess.Popen.send_signal )
(我有没有办法手动释放资源?)
t = Thread(target=some_long_running_external_process)
t.start()
没有办法从some_long_running_external_process
外部退出你的线程( t
)
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