Python——信号量

信号量 某一段代码，同一时间，只能被N个进程使用

 1 import time
 2 import random
 3 from multiprocessing import Porcess
 4 from multiprocessing import Semaphore
 5 
 6 def ktv(i,sem):
 7     sem.acquire()  #获取钥匙
 8     print('%s走进ktv'%i)
 9     time.sleep(random.randint(1,5))
10     print('%s走出ktv'%i)
11     sem.release()   #换钥匙
12     
13     
14 if __name__ == '__main__':
15     sem = Semaphore(4)
16     for i in range(20):
17         p = Process(target=ktv,agrs=(i,sem))
18         p.start()
19         

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