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The difference between fork(), vfork(), exec() and clone()
...wake concurrently since they will influence each other. So the father will sleep at the end of "do_fork()" and awake when child call exit() or execve() since then it will own new page table. Here is the code(in do_fork()) that the father sleep.
if ((clone_flags & CLONE_VFORK) && (retval...
vs2008编译boost详细步骤 - 开源 & Github - 清泛网 - 专注C/C++及内核技术
...组件和算法；
（4）Lambda，在调用的地方定义短小匿名的函数对象，很实用的functional功能；
（5）concept check，检查泛型编程中的concept；
（6）Mpl，用模板实现的元编程框架；
（7）Thread，可移植的C++多线程库；
（8）Python，把...
asynchronous vs non-blocking
... if (msg is not empty)
{
break;
}
else
{
sleep(2000); // 2 sec
}
}
// thread Y
// prepare the book for X
send(X, book);
You can see that this design is non-blocking (you can say that most of time this loop does something nonsense but in CPU's eyes, X is runnin...
What is a “callback” in C and how are they implemented?
.../ do other things while waiting for a connection. In this case
// just sleep for a while.
Sleep(30000);
}
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MLKitCodeScanner 拓展：离线条码 / 二维码识别 · App Inventor 2 中文网
...申请。
打包架构：arm64-v8a + armeabi-v7a + x86 + x86_64（含模拟器）。
.aix 拓展下载：
cn.fun123.MLKit.CodeScanner.aix
快速上手
一、扫图片里的二维码
设计器里放一个 MLKitCodeScanner、一个按钮、...
How can I profile Python code line-by-line?
...icalThread(
profiler=profiler,
)
with statistical_profiler_thread:
sleep(n)
# Likewise, process profile content
Code annotation output format is much like line profiler:
$ pprofile --threads 0 demo/threads.py
Command line: ['demo/threads.py']
Total duration: 1.00573s
File: demo/threads.p...
Declaring variables inside loops, good practice or bad practice?
...lass
{
public:
//constructor
myTimeEatingClass()
{
sleep(2000);
ms_usedTime+=2;
}
~myTimeEatingClass()
{
sleep(3000);
ms_usedTime+=3;
}
const unsigned int getTime() const
{
return ms_usedTime;
...
联网 App 第 1 课：连通测试，把一句话存到服务器再读回来（附 .aia 源码）...
...
跑起来看看
用两台手机（或一台手机 + 模拟器）装同一个 App、填同一个服务地址：一台保存，另一台读取，读到的是同一句话。这就是「联网」的全部秘密——数据不在手机上，在服务器上。
用时一般是几...
CentOS 6.4下Squid代理服务器的安装与配置 - 更多技术 - 清泛网 - 专注C/C++及内核技术
...2:
查看squid 的访问日志。
八、实际应用
下面实验将模拟通过不同的域名访问不同的机器，简单实现企业应用中的负载均衡。客户端在浏览器地址栏中输入www.squid.dev，将访问192.168.1.18这台机器，访问bbs.squid.dev，将访问192.168...
Why is lock(this) {…} bad?
...()
{
lock (this)
{
System.Threading.Thread.Sleep(10000);
}
}
}
class Program
{
static void Main(string[] args)
{
var nancy = new Person {Name = "Nancy Drew", Age = 15};
var a = new Thread(nancy.LockThis);
a.Start();
...