解决python继承实现线程异常can‘t pickle _thread.lock objects

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xzlAwin 2023-06-08 15:05:16 ©著作权

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解决python继承实现线程异常can’t pickle _thread.lock objects

问题描述

运行python代码

# 继承实现线程

from threading import Thread
import multiprocessing
import time

class CountdownThread(Thread):

    def __init__(self, n):
        super().__init__()
        self.n = n
    
    def run(self):
        while self.n > 0:
            print('T-minus', self.n)
            self.n -= 1
            time.sleep(1)

if __name__ == '__main__':
    c = CountdownThread(5)
    #c.run()
    p = multiprocessing.Process(target=c.run)
    #p.run()
    p.start()

异常信息

Traceback (most recent call last):
  File "f:/workspace/python workspace/python cookbook/prj12/prj12_1/src/thread5.py", line 24, in <module>
    p.start()
  File "F:\sdk\python\Python37\lib\multiprocessing\process.py", line 112, in start
    self._popen = self._Popen(self)
  File "F:\sdk\python\Python37\lib\multiprocessing\context.py", line 223, in _Popen
    return _default_context.get_context().Process._Popen(process_obj)
  File "F:\sdk\python\Python37\lib\multiprocessing\context.py", line 322, in _Popen
    return Popen(process_obj)
  File "F:\sdk\python\Python37\lib\multiprocessing\popen_spawn_win32.py", line 89, in __init__
    reduction.dump(process_obj, to_child)
  File "F:\sdk\python\Python37\lib\multiprocessing\reduction.py", line 60, in dump
    ForkingPickler(file, protocol).dump(obj)
TypeError: can't pickle _thread.lock objects
PS F:\workspace\python workspace\python cookbook\prj12\prj12_1\src> Traceback (most recent call last):
  File "<string>", line 1, in <module>
  File "F:\sdk\python\Python37\lib\multiprocessing\spawn.py", line 99, in spawn_main
    new_handle = reduction.steal_handle(parent_pid, pipe_handle)
  File "F:\sdk\python\Python37\lib\multiprocessing\reduction.py", line 82, in steal_handle
    _winapi.PROCESS_DUP_HANDLE, False, source_pid)
OSError: [WinError 87] 参数错误。