python 2.7 中重启时的多处理进程错误

Multiprocessing Process error when restart in python 2.7

您认为以下代码有什么问题?

from multiprocessing import Process as multicore  

class tbe_worker(multicore):  
    def __init__(self):  
        multicore.__init__(self)  
        print "init tbe_worker"  

    def run(self):  
        print "run tbe_worker"  

class Main:  
    def __init__(self):  
        self.w_tbe = tbe_worker()  
        print self.w_tbe  
        print "create w_tbe instance"  

    def startelab(self):  
        print "start thread"  
        print "alive:", self.w_tbe.is_alive()  
        print self.w_tbe  
        self.w_tbe.start()  
        print "after start"  
        print self.w_tbe  

    def stopelab(self):  
        print "alive:", self.w_tbe.is_alive()  
        print "exitcode:", self.w_tbe.exitcode  
        if self.w_tbe.is_alive():  
            print "alive:", self.w_tbe.is_alive()  
            self.w_tbe.terminate()  
            print "alive:", self.w_tbe.is_alive()  
        self.w_tbe.join()  
        print "alive:", self.w_tbe.is_alive()  
        print self.w_tbe  

    def run(self):  
        print "before main run"            
        while True:  
            x = raw_input()  
            if x == "v":  
                self.startelab()  
            else:  
                self.stopelab()  
        print "after main run"  

if __name__ == '__main__':  
    Main().run()  

如果我执行以下操作:

这是测试的输出:

init tbe_worker
<tbe_worker(tbe_worker-1, initial)>
create w_tbe instance
before main run
v
start thread
alive: False
<tbe_worker(tbe_worker-1, initial)>
after start
<tbe_worker(tbe_worker-1, started)>
run tbe_worker
c
alive: False
exitcode: 0
alive: False
<tbe_worker(tbe_worker-1, stopped)>
v
start thread
alive: False
<tbe_worker(tbe_worker-1, stopped)>

我收到这个错误:

File "C:/Program Files/Python27x64/lib/multiprocessing/process.py", line 120,
in start
    assert self._popen is None, 'cannot start a process twice'
AssertionError: cannot start a process twice
Press any key to continue . . .

可能是进程完成和终止后不能多次启动? 如果是这样,每次你想开始一份新工作时我都必须创建一个新流程吗? (好像很奇怪)
但最重要的是,它只发生在我身上?因为在网上我找不到关于它的争论。
肯定有一些我遗漏的东西,但我不知道是什么......

来自 multiprocessing 文档。

start()

Start the process’s activity.

This must be called at most once per process object. It arranges for the object’s run() method to be invoked in a separate process.

如果你想再次启动你的目标函数,你需要创建一个新的进程对象。流程对象是唯一的,它们的生命周期与流程本身绑定。