multithreading - Threads in Python 2.7 -


i'm new python. tried code readers-writers problem stron reader priority, reason, python doesn't consider global variable 'nor'. there issue thread definition? 

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 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 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()

try tiping

global nor

inside class, before nor call. after

def run(self):

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