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信號量（了解）：也是一把鎖semaphore

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1.

from threading import Thread,Semaphore,currentThread
import time#定義信號量(3把鎖)
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()

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2.

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