Python Threading Programming

1. Thread Mode code

#!/usr/bin/python#_*_coding:utf-8_*_import threadingimport timedef producer ():     print  ' chef :  and other people to buy steamed buns ... '     event.wait ()     event.clear ()     print  ' Sb is coning for baozi '     print  ' chef : making  A BAOZI FOR SB ... '     time.sleep (3)     print  ' chef :  your buns are ready '      event.set () Def consumer ():    print  ' maxi :  to buy steamed buns '      event.set ()     time.sleep (1)     print  ' Maxi  : waiting for baozi tobe readly '     event.wait ()      print  ' Gee, it's delicious ' event = threading. Event () p = threading. Thread (Target=producer) c = threading. Thread (Target=consumeR) P.start () C.start () 

Operation Result:

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2, how to call their own thread class

The code is as follows:

#!/usr/bin/python#_*_coding:utf-8_*_from Threading Import Threadimport timeclass MyThread (Thread): #调用我自己的线程方法前,    The run () method of the parent class must be called first; def run: print ' MyThread ' #Thread. Run (self) #启用父类的run (), so that you can call your own thread function super (MyThread. R). Un () def Bar (): print ' bar ', T1 = MyThread (target = Bar) #我的线程方法Bar () function; T1.start () print ' over '

Operation Result:

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3. Thread Safety

The code is as follows:

#!/usr/bin/python#_*_coding:utf-8_*_import Threadingimport timenum = 0 def run (n): Time.sleep (1) samp.acquire () #锁 on global num num + = 1 print '%d\n '% num samp.release () #释放锁 #lock = Threading. Lock () #锁机制, Samp = Threading. Boundedsemaphore (4) #信号量for I in range (£): T = Threading. Thread (target = run, args = (i,)) T.start ()

Because it gives 4 semaphores, it is possible to seize resources at the same time up to 4 processes;

Operation Result:

650) this.width=650; "Src=" Http://s1.51cto.com/wyfs02/M01/89/80/wKioL1gV1c_Su7gFAAAruRTW6Gw204.png-wh_500x0-wm_3 -wmp_4-s_3159204094.png "title=" Qq20161030191309.png "alt=" Wkiol1gv1c_su7gfaaarurtw6gw204.png-wh_50 "/>

When we change the semaphore to 1 o'clock, it is equivalent to the monopoly, at which point the result is definitely 1000;

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Python Threading Programming