Home Backend Development Python Tutorial python线程锁(thread)学习示例

python线程锁(thread)学习示例

Jun 16, 2016 am 08:45 AM
python thread

复制代码 代码如下:

# encoding: UTF-8
import thread
import time

# 一个用于在线程中执行的函数
def func():
    for i in range(5):
        print 'func'
        time.sleep(1)

    # 结束当前线程
    # 这个方法与thread.exit_thread()等价
    thread.exit() # 当func返回时,线程同样会结束

# 启动一个线程,线程立即开始运行
# 这个方法与thread.start_new_thread()等价
# 第一个参数是方法,第二个参数是方法的参数
thread.start_new(func, ()) # 方法没有参数时需要传入空tuple

# 创建一个锁(LockType,不能直接实例化)
# 这个方法与thread.allocate_lock()等价
lock = thread.allocate()

# 判断锁是锁定状态还是释放状态
print lock.locked()

# 锁通常用于控制对共享资源的访问
count = 0

# 获得锁,成功获得锁定后返回True
# 可选的timeout参数不填时将一直阻塞直到获得锁定
# 否则超时后将返回False
if lock.acquire():
    count += 1

    # 释放锁
    lock.release()

# thread模块提供的线程都将在主线程结束后同时结束
time.sleep(6)

thread 模块提供的其他方法:
thread.interrupt_main(): 在其他线程中终止主线程。
thread.get_ident(): 获得一个代表当前线程的魔法数字,常用于从一个字典中获得线程相关的数据。这个数字本身没有任何含义,并且当线程结束后会被新线程复用。

thread还提供了一个ThreadLocal类用于管理线程相关的数据,名为 thread._local,threading中引用了这个类。

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

Hot AI Tools

Undresser.AI Undress

Undresser.AI Undress

AI-powered app for creating realistic nude photos

AI Clothes Remover

AI Clothes Remover

Online AI tool for removing clothes from photos.

Undress AI Tool

Undress AI Tool

Undress images for free

Clothoff.io

Clothoff.io

AI clothes remover

AI Hentai Generator

AI Hentai Generator

Generate AI Hentai for free.

Hot Article

Repo: How To Revive Teammates
1 months ago By 尊渡假赌尊渡假赌尊渡假赌
R.E.P.O. Energy Crystals Explained and What They Do (Yellow Crystal)
2 weeks ago By 尊渡假赌尊渡假赌尊渡假赌
Hello Kitty Island Adventure: How To Get Giant Seeds
1 months ago By 尊渡假赌尊渡假赌尊渡假赌

Hot Tools

Notepad++7.3.1

Notepad++7.3.1

Easy-to-use and free code editor

SublimeText3 Chinese version

SublimeText3 Chinese version

Chinese version, very easy to use

Zend Studio 13.0.1

Zend Studio 13.0.1

Powerful PHP integrated development environment

Dreamweaver CS6

Dreamweaver CS6

Visual web development tools

SublimeText3 Mac version

SublimeText3 Mac version

God-level code editing software (SublimeText3)

Is there any mobile app that can convert XML into PDF? Is there any mobile app that can convert XML into PDF? Apr 02, 2025 pm 08:54 PM

An application that converts XML directly to PDF cannot be found because they are two fundamentally different formats. XML is used to store data, while PDF is used to display documents. To complete the transformation, you can use programming languages ​​and libraries such as Python and ReportLab to parse XML data and generate PDF documents.

What is the process of converting XML into images? What is the process of converting XML into images? Apr 02, 2025 pm 08:24 PM

To convert XML images, you need to determine the XML data structure first, then select a suitable graphical library (such as Python's matplotlib) and method, select a visualization strategy based on the data structure, consider the data volume and image format, perform batch processing or use efficient libraries, and finally save it as PNG, JPEG, or SVG according to the needs.

Is there a mobile app that can convert XML into PDF? Is there a mobile app that can convert XML into PDF? Apr 02, 2025 pm 09:45 PM

There is no APP that can convert all XML files into PDFs because the XML structure is flexible and diverse. The core of XML to PDF is to convert the data structure into a page layout, which requires parsing XML and generating PDF. Common methods include parsing XML using Python libraries such as ElementTree and generating PDFs using ReportLab library. For complex XML, it may be necessary to use XSLT transformation structures. When optimizing performance, consider using multithreaded or multiprocesses and select the appropriate library.

Is the conversion speed fast when converting XML to PDF on mobile phone? Is the conversion speed fast when converting XML to PDF on mobile phone? Apr 02, 2025 pm 10:09 PM

The speed of mobile XML to PDF depends on the following factors: the complexity of XML structure. Mobile hardware configuration conversion method (library, algorithm) code quality optimization methods (select efficient libraries, optimize algorithms, cache data, and utilize multi-threading). Overall, there is no absolute answer and it needs to be optimized according to the specific situation.

How to open xml format How to open xml format Apr 02, 2025 pm 09:00 PM

Use most text editors to open XML files; if you need a more intuitive tree display, you can use an XML editor, such as Oxygen XML Editor or XMLSpy; if you process XML data in a program, you need to use a programming language (such as Python) and XML libraries (such as xml.etree.ElementTree) to parse.

How to beautify the XML format How to beautify the XML format Apr 02, 2025 pm 09:57 PM

XML beautification is essentially improving its readability, including reasonable indentation, line breaks and tag organization. The principle is to traverse the XML tree, add indentation according to the level, and handle empty tags and tags containing text. Python's xml.etree.ElementTree library provides a convenient pretty_xml() function that can implement the above beautification process.

How to convert XML files to PDF on your phone? How to convert XML files to PDF on your phone? Apr 02, 2025 pm 10:12 PM

It is impossible to complete XML to PDF conversion directly on your phone with a single application. It is necessary to use cloud services, which can be achieved through two steps: 1. Convert XML to PDF in the cloud, 2. Access or download the converted PDF file on the mobile phone.

How to control the size of XML converted to images? How to control the size of XML converted to images? Apr 02, 2025 pm 07:24 PM

To generate images through XML, you need to use graph libraries (such as Pillow and JFreeChart) as bridges to generate images based on metadata (size, color) in XML. The key to controlling the size of the image is to adjust the values ​​of the <width> and <height> tags in XML. However, in practical applications, the complexity of XML structure, the fineness of graph drawing, the speed of image generation and memory consumption, and the selection of image formats all have an impact on the generated image size. Therefore, it is necessary to have a deep understanding of XML structure, proficient in the graphics library, and consider factors such as optimization algorithms and image format selection.

See all articles