转：让cpu使用曲线变得有意思

 

//参考《编程之美》

 

// contrltask.cpp : 定义控制台应用程序的入口点。

//


#include "stdafx.h"
#include<Windows.h>
#include<stdlib.h>
#include<math.h>

const double INC = 0.01;
const int COUNT = 200;
const int INTERVAL = 200;
const double PI = 3.1415926;


int _tmain(int argc, _TCHAR* argv[])
{
    DWORD busySpan[COUNT];
    DWORD idleSpan[COUNT];
    double radian = 0.0;
    int half = INTERVAL / 2;
    int i;

    for ( i = 0; i < COUNT; i++)
    {
        busySpan[i] = (DWORD) ( half + sin( PI * radian) * half );
        idleSpan[i] = INTERVAL - busySpan[i];
        radian += INC;
    }

    DWORD startTime = 0;
    int j = 0;

    while(true)
    {
        j = j % COUNT;
        startTime = GetTickCount();
        while((GetTickCount() - startTime) <= busySpan[j]);
        Sleep(idleSpan[j]);
        j++;
    }
    return 0;
}