其实这也没什么值得惊讶的，因为在理解了操作系统调度，以及cpu的指令周期后，都可以用程序模拟出来

下面是编程之美给出的正弦曲线，在一定间隔内，一半时间运行，一半时间sleep。Windows自带的perfmon可以查看详细曲线

#include<iostream>
#include<string.h>
#include<sstream>
#include<set>
#include<algorithm>
#include<vector>
#include<map>
#include<queue>
#include<Windows.h>
#include<math.h>
const double SPLIT = 0.001;
const int COUNT = 2000;
const double PI = acos(-1);
const int INTERVAL = 30;
int main(){
	double busyspan[COUNT];
	double idlespan[COUNT];
	double radian = 0.0;
	int half = INTERVAL / 2;
	for (int i = 0; i < COUNT; i++) {
		busyspan[i] = (double)(half + (sin(PI*radian)));
		idlespan[i] = INTERVAL - busyspan[i];
		radian += SPLIT;
	}
	double starttime = 0;
	int j = 0;
	while (true) {
		j = j % COUNT;
		starttime = GetTickCount();
		while ((GetTickCount() - starttime) < busyspan[j]);
		Sleep(idlespan[j]);
		j++;
	}
	return 0;
}