040同步條件event，040同步event

040同步條件event，040同步event

 

條件同步和條件變數同步差不多意思，只是少了鎖功能，因為條件同步設計於不訪問共用資源的條件環境，event=threading.Event():條件環境對象，初始值為False.
event.isSet():  返回event的狀態值
event.wait():  如果event.isSet()==False將阻塞線程
event.set():  設定event的狀態值為True，所有阻塞池的線程啟用進入就緒狀態，等待作業系統調度
event.clear():  恢複event的狀態值為False

 1 import time,threading 2  3 class Boss(threading.Thread): 4     def run(self): 5         print('Boss:今晚加班到22：00') 6         event.isSet()or event.set() 7         time.sleep(5) 8         print('Boss:<22:00>可以下班了') 9         event.isSet()orevent.set()10 11 class Worker(threading.Thread):12     def run(self):13         event.wait()14         print('Worker:命苦啊～')15         time.sleep(0.25)16         event.clear()17         event.wait()18         print('Worker:oh,yeah')19 20 if __name__ == '__main__':21     event = threading.Event()22     threads = []23     for i in range(5):24         threads.append(Worker())25     threads.append(Boss())26     for t in threads:27         t.start()28     for t in threads:29         t.join()

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 1 import threading,time 2 import random 3 def light(): 4     if not event.isSet(): 5         event.set() #wait就不阻塞 #綠燈狀態 6     count = 0 7     while True: 8         if count < 10: 9             print('\033[42;1m--green light on---\033[0m')10         elif count <13:11             print('\033[43;1m--yellow light on---\033[0m')12         elif count <20:13             if event.isSet():14                 event.clear()15             print('\033[41;1m--red light on---\033[0m')16         else:17             count = 018             event.set() #開啟綠燈19         time.sleep(1)20         count +=121 def car(n):22     while 1:23         time.sleep(random.randrange(10))24         if  event.isSet(): #綠燈25             print("car [%s] is running.." % n)26         else:27             print("car [%s] is waiting for the red light.." %n)28 if __name__ == '__main__':29     event = threading.Event()30     Light = threading.Thread(target=light)31     Light.start()32     for i in range(3):33         t = threading.Thread(target=car,args=(i,))34         t.start()

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來自：http://www.cnblogs.com/yuanchenqi/articles/5733873.html