CPU占用率呈正弦实现,及实时输出进程和线程的CPU占用率

#include "stdafx.h"
#include <windows.h>
#include <math.h>

// 时间转换
static __int64 file_time_2_utc(const FILETIME* ftime)
{
LARGE_INTEGER li;

li.LowPart = ftime->dwLowDateTime;
li.HighPart = ftime->dwHighDateTime;
return li.QuadPart;
}

// 获得CPU的核数
static int get_processor_number()
{
SYSTEM_INFO info;
GetSystemInfo(&info);
return (int)info.dwNumberOfProcessors;
}
// 获取进程CPU占用
int get_cpu_usage(HANDLE hand)
{
//cpu数量
static int processor_count_ = -1;
//上一次的时间
static __int64 last_time_ = 0;
static __int64 last_system_time_ = 0;

FILETIME now;
FILETIME creation_time;
FILETIME exit_time;
FILETIME kernel_time;
FILETIME user_time;
__int64 system_time;
__int64 time;
__int64 system_time_delta;
__int64 time_delta;

int cpu = -1;
if(hand==NULL)
return cpu;
if(processor_count_ == -1)
{
processor_count_ = get_processor_number();
}

GetSystemTimeAsFileTime(&now);

//HANDLE hProcess = OpenProcess(PROCESS_ALL_ACCESS, false, pid);
if (!GetProcessTimes(hand, &creation_time, &exit_time, &kernel_time, &user_time))
{
return -1;
}
system_time = (file_time_2_utc(&kernel_time) + file_time_2_utc(&user_time)) / processor_count_;
time = file_time_2_utc(&now);

if ((last_system_time_ == 0) || (last_time_ == 0))
{
last_system_time_ = system_time;
last_time_ = time;
return -1;
}

system_time_delta = system_time - last_system_time_;
time_delta = time - last_time_;

if (time_delta == 0)
return -1;

cpu = (int)((system_time_delta * 100 + time_delta / 2) / time_delta);
last_system_time_ = system_time;
last_time_ = time;
return cpu;
}
// 获取线程CPU占用
int get_thread_cpu_usage(HANDLE hand)
{
//cpu数量
static int processor_count_ = -1;
//上一次的时间
static __int64 last_time_ = 0;
static __int64 last_system_time_ = 0;

FILETIME now;
FILETIME creation_time;
FILETIME exit_time;
FILETIME kernel_time;
FILETIME user_time;
__int64 system_time;
__int64 time;
__int64 system_time_delta;
__int64 time_delta;

int cpu = -1;
if(hand==NULL)
return cpu;
if(processor_count_ == -1)
{
processor_count_ = get_processor_number();
}

GetSystemTimeAsFileTime(&now);

//HANDLE hProcess = OpenProcess(PROCESS_ALL_ACCESS, false, pid);
if (!GetThreadTimes(hand, &creation_time, &exit_time, &kernel_time, &user_time))
{
return -1;
}
system_time = (file_time_2_utc(&kernel_time) + file_time_2_utc(&user_time)) / processor_count_;
time = file_time_2_utc(&now);

if ((last_system_time_ == 0) || (last_time_ == 0))
{
last_system_time_ = system_time;
last_time_ = time;
return -1;
}

system_time_delta = system_time - last_system_time_;
time_delta = time - last_time_;

if (time_delta == 0)
return -1;

cpu = (int)((system_time_delta * 100 + time_delta / 2) / time_delta);
last_system_time_ = system_time;
last_time_ = time;
return cpu;
}
//CPU占用率呈正弦实现
const double SPLIT = 0.01;
const int COUNT = 200;
const double PI = 3.14159265;
const int INTERVAL = 300;
UINT ThreadFunT()
{
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]) ;
Sleep(idleSpan[j]);
j++;
}
return 0;
}

int main(int argc, char* argv[])
{
HANDLE m,c;
DWORD ThreadID;
int i=0;
//让进程在指定处理器上运行
SetProcessAffinityMask(
GetCurrentProcess(),
0x00000001          //cpu mask
);
m=GetCurrentProcess();
//	c=CreateThread(NULL,
//		0,
//		(LPTHREAD_START_ROUTINE)ThreadFunT,
//		NULL,
//		0,
//		&ThreadID);
Sleep(300);
c=CreateThread(NULL,
0,
(LPTHREAD_START_ROUTINE)ThreadFunT,
NULL,
0,
&ThreadID);
while (i<200)
{
Sleep(100);
printf("CPU:%d%%  Thread:%d%%\n",get_cpu_usage(m),get_thread_cpu_usage(c));
i++;
}
printf("Hello World!\n");
return 0;
}