电脑/python/官方内置模块/fcntl模块.html

<!DOCTYPE html>
<html>
<head>
<!-- 2016-07-30 六 23:05 -->
<meta  charset="utf-8">
<meta  name="viewport" content="width=device-width, initial-scale=1">
<title>fcntl模块</title>
<meta  name="generator" content="Org-mode">
<meta  name="author" content="万泽(德山书生)">
<meta  name="description" content="制作者邮箱：a358003542@gmail.com"
>
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<h1 class="title">fcntl模块</h1>
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<h2>Table of Contents</h2>
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<li><a href="#orgheadline1">1. lockf函数</a></li>
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<h2 id="orgheadline1">lockf函数</h2>
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<pre>
try:
    fcntl.lockf (f, fcntl.LOCK_EX | fcntl.LOCK_NB)
except IOError, e:
    if e.errno == errno.EAGAIN:
        sys.stderr.write ('[%s] Script already running.\n' % time.strftime ('%c') )
        sys.exit (-1)
    raise
</pre>
<p>
lockf第一个参数是python中的文件对象，意思是具体对某个文件执行某个操作，这里的 <code>fcntl.LOCK_EX</code> 是获得一个排他锁，其还可以和 <code>fcntl.LOCK_NB</code> 用或逻辑连起来，意思是如果排他锁不能获得（这通常是指本程序之前某个实例还在运行），那么将会raise IOErro。
</p>

<p>
最后程序进程快运行完了，最好将这个文件解锁，这并不需要你调用lockf然后加上 <code>LOCK_UN</code> 参数，其实简单的关闭原文件对象即可。——有的时候不关闭python程序结束后会自动关闭，但最好还是加上这样一句关闭命令。
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