python - Python 2.7中的线程

我是Python的新手。我试图以更强的读者优先级来编码读者-作家问题，由于某种原因，python并不将我的全局变量视为“ nor”。线程定义有问题吗？

import threading

readers=threading.BoundedSemaphore(1)

writers=threading.BoundedSemaphore(1)

mutex=threading.BoundedSemaphore(1)

nor=0
class reader(threading.Thread):
    def __init__(self):
        threading.Thread.__init__(self)
    def run(self):
        while(1):
            writers.acquire()
            mutex.acquire()
            if(nor==0):
                readers.acquire()
            nor=nor+1
            mutex.release()

            print "I just read\n"

            mutex.acquire()
            if(nor==1):
                readers.release()

            nor=nor-1
            mutex.release()
            writers.release()

class writer(threading.Thread):
  def _init__(self):
          threading.Thread.__init__(self)
  def run(self):
      while(1):
         writers.acquire()
         readers.acquire()

        print "I just wrote\n"

        writers.release()
        readers.release()

r1=reader()
r2=reader()
r3=reader()
w1=writer()
w2=writer()

r1.start()
r2.start()
r3.start()
w1.start()
w2.start()

最佳答案

尝试小费

global nor

在您的班级内部，在nor调用之前。后

def run(self):

关于python - Python 2.7中的线程，我们在Stack Overflow上找到一个类似的问题：https://stackoverflow.com/questions/16086881/