time.sleep-休眠线程或进程吗? [英] time.sleep -- sleeps thread or process?

问题描述

在Python for * nix中，time.sleep()会阻塞线程或进程吗?

In Python for *nix, does time.sleep() block the thread or the process?

推荐答案

它阻止线程.如果在Python源代码中查看Modules/timemodule.c，您会发现在对floatsleep()的调用中，睡眠操作的实质部分包装在Py_BEGIN_ALLOW_THREADS和Py_END_ALLOW_THREADS块中，从而允许其他线程继续执行而当前的一个正在睡觉.您还可以使用简单的python程序对此进行测试:

It blocks the thread. If you look in Modules/timemodule.c in the Python source, you'll see that in the call to floatsleep(), the substantive part of the sleep operation is wrapped in a Py_BEGIN_ALLOW_THREADS and Py_END_ALLOW_THREADS block, allowing other threads to continue to execute while the current one sleeps. You can also test this with a simple python program:

import time
from threading import Thread

class worker(Thread):
    def run(self):
        for x in xrange(0,11):
            print x
            time.sleep(1)

class waiter(Thread):
    def run(self):
        for x in xrange(100,103):
            print x
            time.sleep(5)

def run():
    worker().start()
    waiter().start()

将打印:

>>> thread_test.run()
0
100
>>> 1
2
3
4
5
101
6
7
8
9
10
102

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