標籤:線程 安全執行緒 編寫自己線程類
1、線程模式代碼
#!/usr/bin/python#_*_coding:utf-8_*_import threadingimport timedef Producer(): print ‘chef : 等人來買包子。。。‘ event.wait() event.clear() print ‘sb is coning for baozi...‘ print ‘chef : making a baozi for sb...‘ time.sleep(3) print ‘chef : 你的包子好了‘ event.set()def Consumer(): print ‘maxi : 去買包子‘ event.set() time.sleep(1) print ‘maxi : waiting for baozi tobe readly‘ event.wait() print ‘哎呀,真好吃‘event = threading.Event()p = threading.Thread(target=Producer)c = threading.Thread(target=Consumer)p.start()c.start()
運行結果:
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2、怎樣調用自己的線程類
代碼如下:
#!/usr/bin/python#_*_coding:utf-8_*_from threading import Threadimport timeclass MyThread(Thread): #調用我自己的線程方法前,必須先調用父類的run()方法; def run(self): print ‘myThread‘ #Thread.run(self) #啟用父類的run(),只有這樣才能調用自己的線程函數 super(MyThread, self).run()def Bar(): print ‘bar‘,t1 = MyThread(target = Bar) #我的線程方法Bar()函數;t1.start()print ‘over‘
運行結果:
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3、安全執行緒
代碼如下:
#!/usr/bin/python#_*_coding:utf-8_*_import threadingimport timenum = 0 def run(n): time.sleep(1) samp.acquire() #鎖上 global num num += 1 print ‘%d\n‘ % num samp.release() #釋放鎖#lock = threading.Lock() #鎖機制,samp = threading.BoundedSemaphore(4) #訊號量for i in range(1000): t = threading.Thread(target = run, args = (i,)) t.start()
因為上面給了4個訊號量,就是可以同時最多有4個進程搶佔資源;
運行結果:
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當我們把訊號量改為1時,就相當於獨佔,此時結果肯定就是1000了;
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本文出自 “11586096” 部落格,請務必保留此出處http://11596096.blog.51cto.com/11586096/1867424
python線程編程