C++ 《编程之美》控制你的CPU占有率

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此样例CPU有4核心8线程，CPU0在图中未展示

#include 
#include 
#include 
#define PI 3.1415926535
using namespace std;
const double _1000MILLI = 1000;
void per_second_cpu(__int64 start_time,double busy_time_rate){
    start_time = GetTickCount();
    while ((GetTickCount() - start_time) <= busy_time_rate * _1000MILLI){}
    Sleep((1.0-busy_time_rate) * _1000MILLI);
}
void line_cpu( double busy_time_rate ){
    __int64 start_time;
    while(true){
        per_second_cpu(start_time,busy_time_rate);
    }
}
void sin_cpu(){
    __int64 start_time;
    while(true){
        int t = 15;
        for (int i = 0; i < t; ++i) {
            double busy_time_rate =  sin( i * 2 / ( t * 1.0 ) * PI ) / 2.0 + 0.5;
            per_second_cpu(start_time , busy_time_rate);
        }
    }
}
DWORD WINAPI handle_line(LPVOID lpParameter){
    line_cpu(*(double*)lpParameter);
}
DWORD WINAPI handle_sin(LPVOID lpParameter){
    sin_cpu();
}
void begin_line(double busy_time_rate){
    SetProcessAffinityMask(GetCurrentProcess(),255);
    for (int i = 0; i < 7; ++i) {
        HANDLE handleProcess = CreateThread(NULL, 0, handle_line, &busy_time_rate, 0, NULL);
        CloseHandle(handleProcess);
    }
    line_cpu(busy_time_rate);
}
void begin_sin(){
    SetProcessAffinityMask(GetCurrentProcess(),255);
    for (int i = 0; i < 7; ++i) {
        HANDLE handleProcess = CreateThread(NULL, 0, handle_sin, NULL, 0, NULL);
        CloseHandle(handleProcess);
    }
    sin_cpu();
}
int main() {
//    double busy_time_rate=0.5;
//    begin_line(busy_time_rate);
    begin_sin();
    return 0;
}

sin()曲线

指定占用率