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这是代码，这些是虚拟类，最终将被更有用的东西取代。我想要 while 循环做的是从队列中提取数据以查看是否丢弃了毒丸。如果不是，我想触发 else 语句中的任何内容。但是由于某种原因，它会等到它得到一个毒丸，并且只执行杀死条件 if 语句

class test_imports:#Test classes remove 

      def import_1(self, control_queue, thread_number):
          print ("Import_1 number %d started") % thread_number
          run = True
          count = 1
          while run == True:
                alive = control_queue.get()                
                count = count + 1
                if alive == 't1kill':#<==will trigger
                   print ("Killing thread type 1 number %d") % thread_number
                   run = False                   
                else:#<== won't trigger
                     print ("Thread type 1 number %d run count %d") % (thread_number, count)

如果需要，其余代码是：

import multiprocessing 
import time 

class test_imports:#Test classes remove 

      def import_1(self, control_queue, thread_number):
          print ("Import_1 number %d started") % thread_number
          run = True
          count = 1
          while run == True:
                alive = control_queue.get()                
                count = count + 1
                if alive == 't1kill':
                   print ("Killing thread type 1 number %d") % thread_number
                   run = False                   
                else:
                    print ("Thread type 1 number %d run count %d") % (thread_number, count)     



      def import_2(self, control_queue, thread_number):
          print ("Import_2 number %d started") % thread_number
          run = True
          count = 1
          while run == True:
                alive = control_queue.get()                   
                count = count + 1
                if alive == 't2kill':
                   print ("Killing thread type 2 number %d") % thread_number
                   run = False
                else:
                     print ("Thread type 2 number %d run count %d") % (thread_number, count)


class worker_manager:
     def __init__(self):
        self.children = {}

     def generate(self, control_queue, threadName, runNum):
        i = test_imports()
        if threadName == 'one':
            print ("Starting import_1 number %d") % runNum
            p = multiprocessing.Process(target=i.import_1, args=(control_queue, runNum))
            self.children[threadName] = p
            p.start()        
        elif threadName == 'two': 
            print ("Starting import_2 number %d") % runNum
            p = multiprocessing.Process(target=i.import_2, args=(control_queue, runNum))
            self.children[threadName] = p
            p.start()
        elif threadName == 'three':    
            p = multiprocessing.Process(target=i.import_1, args=(control_queue, runNum))
            print ("Starting import_1 number %d") % runNum
            p2 = multiprocessing.Process(target=i.import_2, args=(control_queue, runNum))
            print ("Starting import_2 number %d") % runNum
            self.children[threadName] = p
            self.children[threadName] = p2
            p.start()
            p2.start()

        else:
            print ("Not a valid choice choose one two or three")     

     def terminate(self, threadName):
         self.children[threadName].join


if __name__ == '__main__':
    # Establish communication queues
    control = multiprocessing.Queue()
    manager = worker_manager()

    runNum = int(raw_input("Enter a number: ")) 
    threadNum = int(raw_input("Enter number of threads: "))
    threadName = raw_input("Enter number: ")
    thread_Count = 0

    print ("Starting threads") 

    for i in range(threadNum):
        manager.generate(control, threadName, i)
        thread_Count = thread_Count + 1              

    time.sleep(runNum)#let threads do their thing

    print ("Terminating threads")     

    for i in range(thread_Count):
        control.put("t1kill")
        control.put("t2kill")

    manager.terminate(threadName)

请注意，除了打印不同的东西外，它import_2是相同的。import_1重点是证明处理不同线程类型的能力。

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1 回答 1

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在您的驱动程序代码中，您control.put("t1kill")首先。

t1kill以及您的sets处理程序run = False，因此您将不会再通过while run == True循环返回。

所以，你没有机会else被触发。

如果你想测试它，只需添加put一些虚拟值：

for i in range(thread_Count):
    control.put("dummy")
    control.put("t1kill")
    control.put("t2kill")

但是，在您的实际代码中，您可能希望该manager.generate方法将一些有用的值放入队列中。

作为旁注，您使代码比需要的更复杂。

while run == True:首先，写而不是写几乎总是一个坏主意while run:。正如 PEP 8 的编程建议部分所说：

不要使用 == 将布尔值与 True 或 False 进行比较。

但实际上，您可以return在完成后立即完全废弃run标志：

while True:
    alive = control_queue.get()                
    count = count + 1
    if alive == 't1kill':
        print ("Killing thread type 1 number %d") % thread_number
        return                   
    else:
        print ("Thread type 1 number %d run count %d") % (thread_number, count)

（有些人会告诉你break，earlyreturn等是“糟糕的结构化编程”。但 Python 不是 C。）

于 2013-08-08T01:10:37.370 回答