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信号量（了解）：也是一把锁semaphore

 

1.

from threading import Thread,Semaphore,currentThread
import time#定义信号量(3把锁)
sm = Semaphore(3)def task():with sm:print('%s acquires the sm' % currentThread().getName())time.sleep(1)if __name__ == '__main__':for i in range(10):t = Thread(target=task)t.start()

 

2.

sm.acquire()
print('%s acquires the sm'%currentThread().getName())
sm.release()#等价于
with sm:print('%s acquires the sm'%currentThread().getName())