CPU控制程序

N久前心血来潮看了邹欣老师的编程之美，觉得这个CPU控制的程序很有意思，但当时自己的电脑是多核的，效果不是很好，所以就在他原来的代码基础上加了个线程调度，让其全部分配到一个核中，然后正弦曲线就比较美观了。

（当然还研究了其他一些程序，思考过一些东西，但现在忘了，等什么时候有新的思考后再贴上来吧）

完整源码：

// C++ code to make task manager generate sine graph
#include "Windows.h"
#include "stdlib.h"
#include "math.h"
#include <iostream>
using namespace std;

const double SPLIT =0.01;
const int COUNT = 200;
const double PI = 3.14159265;
const int INTERVAL = 300;

static DWORD WINAPI _tmain(LPVOID p);

int main(int argc, char* argv[])
{
    char szbuf[200];
    DWORD id;
    HANDLE hHandle = CreateThread(NULL,0,_tmain,&szbuf,CREATE_SUSPENDED,&id);
    if( hHandle == NULL)
    {
        cout << "error"<<endl;
        return 0;
    }

    SetThreadAffinityMask(hHandle,2);
    ResumeThread(hHandle);
    if(WaitForSingleObject(hHandle,INFINITE) != WAIT_OBJECT_0)
    {
        CloseHandle(hHandle);
        return 0;
    }
}

static DWORD WINAPI _tmain(LPVOID p)
{
    DWORD busySpan[COUNT];            // ARRAY OF BUSY TIMES
    DWORD idleSpan[COUNT];            // ARRAY OF IDLE TIMES
    int half = INTERVAL / 2;
    double radian = 0.0;
    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;
    while(true)
    {
        j = j % COUNT;
        startTime = GetTickCount();
        while ( (GetTickCount() - startTime) <= busySpan[j])
        {
            /*_asm{
                push eax;
                move eax,1;
                pop eax;
            }*/
            //cout << "_tmain! Great!"<< endl;
        }
        Sleep(idleSpan[j]);
        j++;
    }
}

效果图：