Home > Backend Development > Python Tutorial > Python中多线程thread与threading的实现方法

Python中多线程thread与threading的实现方法

WBOY
Release: 2016-06-16 08:42:47
Original
1389 people have browsed it

学过Python的人应该都知道,Python是支持多线程的,并且是native的线程。本文主要是通过thread和threading这两个模块来实现多线程的。

python的thread模块是比较底层的模块,python的threading模块是对thread做了一些包装的,可以更加方便的被使用。

这里需要提一下的是python对线程的支持还不够完善,不能利用多CPU,但是下个版本的python中已经考虑改进这点,让我们拭目以待吧。

threading模块里面主要是对一些线程的操作对象化了,创建了叫Thread的class。

一般来说,使用线程有两种模式,一种是创建线程要执行的函数,把这个函数传递进Thread对象里,让它来执行;另一种是直接从Thread继承,创建一个新的class,把线程执行的代码放到这个新的 class里。

我们来看看这两种做法吧。

一、Python thread实现多线程

#-*- encoding: gb2312 -*-
import string, threading, time
 
def thread_main(a):
  global count, mutex
  # 获得线程名
  threadname = threading.currentThread().getName()
 
  for x in xrange(0, int(a)):
    # 取得锁
    mutex.acquire()
    count = count + 1
    # 释放锁
    mutex.release()
    print threadname, x, count
    time.sleep(1)
 
def main(num):
  global count, mutex
  threads = []
 
  count = 1
  # 创建一个锁
  mutex = threading.Lock()
  # 先创建线程对象
  for x in xrange(0, num):
    threads.append(threading.Thread(target=thread_main, args=(10,)))
  # 启动所有线程
  for t in threads:
    t.start()
  # 主线程中等待所有子线程退出
  for t in threads:
    t.join() 
 
 
if __name__ == '__main__':
  num = 4
  # 创建4个线程
  main(4)

Copy after login

二、Python threading实现多线程

#-*- encoding: gb2312 -*-
import threading
import time
 
class Test(threading.Thread):
  def __init__(self, num):
    threading.Thread.__init__(self)
    self._run_num = num
 
  def run(self):
    global count, mutex
    threadname = threading.currentThread().getName()
 
    for x in xrange(0, int(self._run_num)):
      mutex.acquire()
      count = count + 1
      mutex.release()
      print threadname, x, count
      time.sleep(1)
 
if __name__ == '__main__':
  global count, mutex
  threads = []
  num = 4
  count = 1
  # 创建锁
  mutex = threading.Lock()
  # 创建线程对象
  for x in xrange(0, num):
    threads.append(Test(10))
  # 启动线程
  for t in threads:
    t.start()
  # 等待子线程结束
  for t in threads:
    t.join() 

Copy after login

相信本文所述Python多线程实例对大家的Python程序设计能够起到一定的借鉴价值。

Related labels:
source:php.cn
Statement of this Website
The content of this article is voluntarily contributed by netizens, and the copyright belongs to the original author. This site does not assume corresponding legal responsibility. If you find any content suspected of plagiarism or infringement, please contact admin@php.cn
Popular Tutorials
More>
Latest Downloads
More>
Web Effects
Website Source Code
Website Materials
Front End Template