1 import threading
 2 import time
 3 
 4 sempaphore = threading.Semaphore(3)  #计数为1
 5 
 6 def fun():
 7     print "Thread %s is waiting semphore\n" % threading.currentThread().getName()
 8     sempaphore.acquire()
 9     print "Thread %s get semphore\n" % threading.currentThread().getName()
10     time.sleep(1)
11     print "Thread %s release semphore\n" % threading.currentThread().getName()
12     sempaphore.release()
13 
14 
15 if __name__ == "__main__":
16     t1 = threading.Thread(target=fun)
17     t2 = threading.Thread(target=fun)
18     t3 = threading.Thread(target=fun)
19     t4 = threading.Thread(target=fun)
20 
21     t1.start()
22     t2.start()
23     t3.start()
24     t4.start()
25 
26     t1.join()
27     t2.join()
28     t3.join()
29     t4.join()