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65 lines
1.8 KiB
C++
65 lines
1.8 KiB
C++
#include <windows.h>
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#include <thread>
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#include <string.h>
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#include "cpu.h"
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#include <iostream>
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#define SystemProcessorPerformanceInformation 0x8
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#define SystemBasicInformation 0x0
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FILETIME last_userTime, last_kernelTime, last_idleTime;
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uint64_t FileTimeToInt64( const FILETIME& ft ) {
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ULARGE_INTEGER uli = { 0 };
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uli.LowPart = ft.dwLowDateTime;
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uli.HighPart = ft.dwHighDateTime;
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return uli.QuadPart;
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}
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bool CPUStats::UpdateCPUData()
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{
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#define NUMBER_OF_PROCESSORS (8)
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#define PROCESSOR_BUFFER_SIZE (NUMBER_OF_PROCESSORS * 8)
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static ULONG64 ProcessorIdleTimeBuffer [ PROCESSOR_BUFFER_SIZE ];
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FILETIME IdleTime, KernelTime, UserTime;
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static unsigned long long PrevTotal = 0;
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static unsigned long long PrevIdle = 0;
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static unsigned long long PrevUser = 0;
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unsigned long long ThisTotal;
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unsigned long long ThisIdle, ThisKernel, ThisUser;
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unsigned long long TotalSinceLast, IdleSinceLast, UserSinceLast;
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// GET THE KERNEL / USER / IDLE times.
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// And oh, BTW, kernel time includes idle time
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GetSystemTimes( & IdleTime, & KernelTime, & UserTime);
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ThisIdle = FileTimeToInt64(IdleTime);
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ThisKernel = FileTimeToInt64 (KernelTime);
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ThisUser = FileTimeToInt64 (UserTime);
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ThisTotal = ThisKernel + ThisUser;
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TotalSinceLast = ThisTotal - PrevTotal;
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IdleSinceLast = ThisIdle - PrevIdle;
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UserSinceLast = ThisUser - PrevUser;
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double Headroom;
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Headroom = (double)IdleSinceLast / (double)TotalSinceLast ;
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double Load;
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Load = 1.0 - Headroom;
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Headroom *= 100.0; // to make it percent
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Load *= 100.0; // percent
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PrevTotal = ThisTotal;
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PrevIdle = ThisIdle;
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PrevUser = ThisUser;
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// print results to output window of VS when run in Debug
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m_cpuDataTotal.percent = Load;
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return true;
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}
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CPUStats::CPUStats()
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{
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}
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CPUStats::~CPUStats()
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{
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}
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CPUStats cpuStats; |