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Check to see if python script is running
...cleanly, and check for it when you start up.
#/usr/bin/env python
import os
import sys
pid = str(os.getpid())
pidfile = "/tmp/mydaemon.pid"
if os.path.isfile(pidfile):
print "%s already exists, exiting" % pidfile
sys.exit()
file(pidfile, 'w').write(pid)
try:
# Do some actual work her...
浅析为什么char类型的范围是 -128~+127 - C/C++ - 清泛网 - 专注C/C++及内核技术
...起来也很简单容易， 以至于不用去思考为什么，不是有一个整型范围的公式吗： -2^(n-1)~2^(n-1)-1 n为整型的内存占用位数，所以int类型32位 那么就是 -(2^31)~2^31 -1 即
-2147483648~2147483647,但是为什么最小负数绝对值总比最大正数...
为什么你越努力，却越焦虑？ - 杂谈 - 清泛网 - 专注C/C++及内核技术
...适」中。回头看看这段经历，我想我能够立刻给这个问题一个真诚的答案：不要缓解努力带来的焦虑！不要缓解努力带来的焦虑！不要缓解努力带来的焦虑！
在博一和博二的一段岁月里，我对当下做的论文产生了一种莫名其...
Web API 最佳入门指南 - 更多技术 - 清泛网 - 专注C/C++及内核技术
Web API 最佳入门指南WebAPI是一个比较宽泛的概念。这里我们提到WebAPI特指ASP.NETWebAPI。这篇文章中我们主要介绍WebAPI的主要功能以及与其他同类型框架的对比，最后通过一些相对复杂的实例展示如何通过WebAPI构建http服务，同时也...
MFC的多国语言界面的实现 - C/C++ - 清泛网 - 专注C/C++及内核技术
...口到多个国家，因此，为软件提供多国语言支持就成为了一个基本条件。为软件提供多国语言的支持的具体实现方法有很多，...目前很多软件都是要出口到多个国家，因此，为软件提供多国语言支持就成为了一个基本条件。为软...
After Installing Java JDK 7 For Mac OS X - mvn -version still shows java version 1.6.0_31
Oracle released Java JDK 7 on April 26 for Mac OS X. I followed the install instructions and when I do java -version in a terminal window I get:
...
How to find the Windows version from the PowerShell command line
...
Since you have access to the .NET library, you could access the OSVersion property of the System.Environment class to get this information. For the version number, there is the Version property.
For example,
PS C:\> [System.Environment]::OSVersion.Version
Major Minor Build Revisi...
Why does GCC generate 15-20% faster code if I optimize for size instead of speed?
...he tendency to generate noticeably faster code if I optimize for size ( -Os ) instead of speed ( -O2 or -O3 ), and I have been wondering ever since why.
...
How to perform file system scanning
...lk(). The original is below.
package main
import (
"path/filepath"
"os"
"flag"
"fmt"
)
func visit(path string, f os.FileInfo, err error) error {
fmt.Printf("Visited: %s\n", path)
return nil
}
func main() {
flag.Parse()
root := flag.Arg(0)
err := filepath.Walk(root, visit)
...
How is Docker different from a virtual machine?
...ly known as libcontainer), which runs in the same operating system as its host. This allows it to share a lot of the host operating system resources. Also, it uses a layered filesystem (AuFS) and manages networking.
AuFS is a layered file system, so you can have a read only part and a write part wh...