os_kernel_lab/related_info/lab7/semaphore_condition/thr-ex8.py

import threading  
   
counterA = 0  
counterB = 0  
   
mutexA = threading.Lock()  
mutexB = threading.Lock()  
   
class MyThread(threading.Thread):  
    def __init__(self):  
        threading.Thread.__init__(self)  
      
    def run(self):  
        self.fun1()  
        self.fun2()  
          
    def fun1(self):  
        global mutexA, mutexB  
        if mutexA.acquire():  
            print "I am %s , get res: %s" %(self.name, "ResA")  
              
            if mutexB.acquire():  
                print "I am %s , get res: %s" %(self.name, "ResB")  
                mutexB.release()  
             
        mutexA.release()   
          
    def fun2(self):  
        global mutexA, mutexB  
        if mutexB.acquire():  
            print "I am %s , get res: %s" %(self.name, "ResB")  
              
            if mutexA.acquire():  
                print "I am %s , get res: %s" %(self.name, "ResA")  
                mutexA.release()  
             
        mutexB.release()   
      
if __name__ == "__main__":  
    for i in range(0, 100):  
        my_thread = MyThread()  
        my_thread.start()