thread.start_new_thread与threading.Thread.start [英] thread.start_new_thread vs threading.Thread.start

问题描述

python中的thread.start_new_thread和threading.Thread.start有什么区别?
我注意到，当调用start_new_thread时，新线程将在调用线程终止时终止. threading.Thread.start相反:调用线程等待其他线程终止.

What is the difference between thread.start_new_thread and threading.Thread.start in python?
I have noticed that when start_new_thread is called, the new thread terminates as soon as the calling thread terminates. threading.Thread.start is the opposite: the calling thread waits for other threads to terminate.

推荐答案

thread模块是Python的低级线程API.不建议直接使用它，除非您确实需要. threading模块是建立在thread之上的高级API. Thread.start方法实际上是使用thread.start_new_thread实现的.

The thread module is the low-level threading API of Python. Its direct usage isn't recommended, unless you really need to. The threading module is a high-level API, built on top of thread. The Thread.start method is actually implemented using thread.start_new_thread.

必须在调用start之前设置Thread的daemon属性，指定线程是否应该是守护程序.当没有活动的非守护线程时，整个Python程序将退出.默认情况下，daemon是False，因此该线程不是守护程序，因此该进程将等待其所有非守护程序线程退出，这是您正在观察的行为.

The daemon attribute of Thread must be set before calling start, specifying whether the thread should be a daemon. The entire Python program exits when no alive non-daemon threads are left. By default, daemon is False, so the thread is not a daemon, and hence the process will wait for all its non-daemon thread to exit, which is the behavior you're observing.

P.S. start_new_thread确实是非常低级的.它只是Python核心线程启动器的一个薄包装，它本身称为OS线程生成功能.

P.S. start_new_thread really is very low-level. It's just a thin wrapper around the Python core thread launcher, which itself calls the OS thread spawning function.

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