利用空循环（Busy）和System Idle Process（Free）来操作CPU工作。

#include <Windows.h>  
#include<stdlib.h>  
#include<math.h>  
#include<tchar.h>  
const double SPLIT = 0.01;  
const int COUNT = 200;  
const double PI = 3.14159265;  
const int INTERVAL = 300;  
int _tmain(int argc, _TCHAR* argv[] )  
{  
    DWORD busySpan[COUNT]; //array of busy times  
    DWORD idleSpan[COUNT]; //array of idle times  
    int half = INTERVAL/2;  
    double radian = 0.0;  
        //如何近似趋近一条正弦曲线？这样！  
    for(int i = 0; i < COUNT; ++i)  
    {  
        busySpan[i] = (DWORD)(half + (sin(PI * radian) * half));  
        idleSpan[i] = INTERVAL - busySpan[i];  
        radian += SPLIT;  
    }  
    DWORD startTime = 0;  
    int j = 0;  
    ::SetProcessAffinityMask(::GetCurrentProcess(),0x00000002);   
    while(true)  
    {  
        j = j % COUNT;  
        startTime = GetTickCount();  
        while((GetTickCount() - startTime) <= busySpan[j]);  
            Sleep(idleSpan[j]);  
        j++;  
    }  
    return 0;  
}

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