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http://hackgou.itbbq.com/python%e5%a4%9a%e7%ba%bf%e7%a8%8b%e7%bc%96%e7%a8%8b1-%e7%ba%bf%e7%a8%8b%e5%af%b9%e8%b1%a1.html sleeping-> runnable… ，只是因为计算机执行速度很快，而时间片段间隔很小，我们感受不 到，以为是同时进行的。所以说一个线程在start了之后只是处在了可以运行的状 态，他什么时候运行还是由系统来进行调度的。 那一个线程什么时候会“dead”呢？一般来说当线程对象的run方法执行结束或者在 执行中抛出异常的话，那么这个线程就会结束了。系统会自动对“dead”状态线程进 行清理。 如果一个线程t1在执行的过程中需要等待另一个线程t2执行结束后才能运行的话那 就可以在t1在调用t2的join()方法 .... def t1(...): ... t2.join() ... 这样t1在执行到t2.join()语句后就会等待t2结束后才会继续运行。 但是假如t1是个死循环的话那么等待就没有意义了，那怎么办呢？可以在调用t2的 join()方法的时候给一个浮点数做超时参数，这样这个线程就不会等到花儿也谢了 了。我等你10s，你不回来我还不允许我改嫁啊？:) def t1(...): ... t2.join(10) ... 如果一个进程的主线程运行完毕而子线程还在执行的话，那么进程就不会退出，直 到所有子线程结束为止，如何让主线程结束的时候其他子线程也乖乖的跟老大撤退 呢？那就要把那些不听话的人设置为听话的小弟，使用线程对象的setDaemon()方 法，参数为bool型。True的话就代表你要听话，我老大（主线程）扯呼，你也要跟 着撤，不能拖后腿。如果是False的话就不用那么听话了，老大允许你们将在外军 命有所不受的。需要注意的是setDaemon()方法必须在线程对象没有调用start()方 法之前调用，否则没效果。 t1 = mythread('t1') print t1.getName(),t1.isDaemon() t1.setDaemon(True) print t1.getName(),t1.isDaemon() t1.start() print 'main thread exit' 当执行到 print ‘main thread exit’ 后，主线程就退出了，当然t1这个线程也跟 着结束了。但是如果不使用t1线程对象的setDaemon()方法的话，即便主线程结束 了，还要等待t1线程自己结束才能退出进程。isDaemon()是用来获得一个线程对象 的Daemonflag状态的。 如何来获得与线程有关的信息呢？ 获得当前正在运行的线程的引用 running = threading.currentThread() 获得当前所有活动对象（即run方法开始但是未终止的任何线程）的一个列表 threadlist = threading.enumerate() 获得这个列表的长度 threadcount = threading.activeCount() 查看一个线程对象的状态调用这个线程对象的isAlive()方法，返回1代表处于 “runnable”状态且没有“dead” threadflag = threading.isAlive() ]]> http://hackgou.itbbq.com/python%e5%a4%9a%e7%ba%bf%e7%a8%8b%e7%bc%96%e7%a8%8b1-%e7%ba%bf%e7%a8%8b%e5%af%b9%e8%b1%a1.html/feed 0