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78 lines
1.7 KiB
C++
78 lines
1.7 KiB
C++
#pragma once
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#ifndef RUNTIME_TIMER_H
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#define RUNTIME_TIMER_H
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#ifdef _WIN32
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#include <Windows.h>
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#endif
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#include <cstdint>
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#include <ctime>
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#include <cstdint>
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class Timer {
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public:
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explicit Timer() { start(); }
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#ifdef _WIN32
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#define MS_PER_SEC 1000ULL // MS = milliseconds
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#define US_PER_MS 1000ULL // US = microseconds
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#define HNS_PER_US 10ULL // HNS = hundred-nanoseconds (e.g., 1 hns = 100 ns)
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#define NS_PER_US 1000ULL
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#define HNS_PER_SEC (MS_PER_SEC * US_PER_MS * HNS_PER_US)
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#define NS_PER_HNS (100ULL) // NS = nanoseconds
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#define NS_PER_SEC (MS_PER_SEC * US_PER_MS * NS_PER_US)
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int Timer::clock_gettime_monotonic(struct timespec* tv) {
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static LARGE_INTEGER ticksPerSec;
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LARGE_INTEGER ticks;
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double seconds;
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if (!ticksPerSec.QuadPart) {
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QueryPerformanceFrequency(&ticksPerSec);
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if (!ticksPerSec.QuadPart) {
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errno = ENOTSUP;
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return -1;
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}
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}
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QueryPerformanceCounter(&ticks);
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seconds = (double)ticks.QuadPart / (double)ticksPerSec.QuadPart;
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tv->tv_sec = (time_t)seconds;
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tv->tv_nsec = (long)((ULONGLONG)(seconds * NS_PER_SEC) % NS_PER_SEC);
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return 0;
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}
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#endif
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void start() {
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#ifdef _WIN32
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clock_gettime_monotonic(&_startTime);
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#elif __linux__
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clock_gettime(CLOCK_MONOTONIC, &_startTime);
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#endif
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}
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double getMs() { return (double)getNs() / 1.e6; }
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int64_t getNs() {
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struct timespec now;
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#ifdef _WIN32
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clock_gettime_monotonic(&now);
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#elif __linux__
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clock_gettime(CLOCK_MONOTONIC, &now);
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#endif
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return (int64_t)(now.tv_nsec - _startTime.tv_nsec) +
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1000000000 * (now.tv_sec - _startTime.tv_sec);
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}
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double getSeconds() { return (double)getNs() / 1.e9; }
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struct timespec _startTime;
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};
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#endif // RUNTIME_TIMER_H
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