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可重入函数、不可重入函数及线程安全 - C/C++ - 清泛网 - 专注C/C++及内核技术
...点一般都是不可重入的 (浮点运算大多使用协处理器或者软件模拟来实现。
关于信号处理程序中调用不可重入函数的例子：
#include <stdlib.h>
#include <stdio.h>
#include <pwd.h>
static void func(int signo)
{
struct passwd *rootptr;
if( (...
MVC演化史 - 更多技术 - 清泛网 - 专注C/C++及内核技术
...测试的。
从View中分离Controller就不那么重要了。Desktop软件的时代，View和Controller往往是一一对应的关系，所以常常把他们合并成为UI，事实上，当时多数UI框架都没有实现从View中分离Controller。后来随着Web的兴起，这种分离（模...
剖析程序的内存布局 - C/C++ - 清泛网 - 专注C/C++及内核技术
...拟地址被使能，那么它就会作用于这台机器上运行的所有软件，包括内核本身。因此一部分虚拟地址必须保留给内核使用：
这并不意味着内核使用了那么多的物理内存，仅表示它可支配这么大的地址空间，可根据...
How to find the operating system version using JavaScript?
How can I find the OS name and OS version using JavaScript?
13 Answers
13
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What's the difference between an inverted index and a plain old index?
... in order for the words to have meaning. If, as a culture, we decided to flip left and right, then you'd have the same issue figuring out what a "right turn" vs a "left turn" is since the agreed upon meaning had changed. However, the naming is arbitrary, so which one is which (in and of itself) does...
How many socket connections can a web server handle?
...th asynchronous in mind. You should use Promises at least, and when ECMAScript 7 comes along, async/await. C#/.Net already has full asynchronous support like node.js. Whatever the OS and platform, asynchronous should be expected to perform very well. And whatever language you choose, look for the ke...
Best approach to real time http streaming to HTML5 video client
...MP4 and I had to tune the FFMPEG parameters, and the standard node stream pipe redirection over http that I used originally was all that was needed.
In MP4 there is a 'fragmentation' option that breaks the mp4 into much smaller fragments which has its own index and makes the mp4 live streaming opti...
MediaHelper 媒体助手扩展：从媒体文件提取元数据和专辑封面 · App Inventor 2 中文网
...e
获取或设置媒体文件的 MIME 类型。
超时时间 Timeout
网络加载等待时间（秒）。默认值：3秒。
标题 Title
获取或设置媒体文件的标题。
编写者 Writer
获取或设置媒体文件的编写者信息。
年份 Year
获取或设置媒体文...
Nginx no-www to www and www to no-www
...ix https:// and http://.
To check the nginx version, use nginx -v.
Strip www from url with nginx redirect
server {
server_name www.domain.com;
rewrite ^(.*) http://domain.com$1 permanent;
}
server {
server_name domain.com;
#The rest of your configuration goes here#
}
So yo...
ImageView 扩展：图片查看器扩展，支持缩放、双击缩放和动画缩放 · App In...
...前版本不支持缓存
路径设置：可以使用本地文件路径或网络URL
组件兼容性：建议使用 Image 或 Arrangement 组件作为视图
性能考虑：大尺寸图片可能影响加载性能
性能优化建议
图片优化：使用合适尺寸和...