chrono: add
Signed-off-by: Simon Rozman <simon@rozman.si>
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include/stdex/chrono.hpp
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157
include/stdex/chrono.hpp
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/*
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SPDX-License-Identifier: MIT
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Copyright © 2023 Amebis
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*/
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#pragma once
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#include "sal.hpp"
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#include <stdint.h>
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#ifdef _WIN32
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#include <windows.h>
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#endif
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#include <chrono>
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#include <stdexcept>
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namespace stdex {
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namespace chrono
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{
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struct aosn_clock
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{
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using rep = int64_t;
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using period = std::ratio<1, 1'000'000>; // 1 microsecond
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using duration = std::chrono::duration<rep, period>;
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using time_point = std::chrono::time_point<aosn_clock>;
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static constexpr bool is_steady = false;
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static constexpr rep f_second = 1000; // number of milliseconds per second
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static constexpr rep f_minute = 60; // number of seconds per minute
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static constexpr rep f_hour = 60; // number of minutes na hour
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static constexpr rep f_day = 24; // number of hours na day
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static constexpr rep f_week = 7; // number of days per week
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static constexpr rep second = f_second; // number of milliseconds per second
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static constexpr rep minute = f_minute * second; // number of milliseconds per minute
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static constexpr rep hour = f_hour * minute; // number of milliseconds per hour
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static constexpr rep day = f_day * hour; // number of milliseconds per day
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static constexpr rep week = f_week * day; // number of milliseconds per week
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///
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/// Gets current time
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///
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static time_point now() noexcept
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{
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#ifdef _WIN32
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FILETIME t;
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GetSystemTimeAsFileTime(&t);
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return from_system(t);
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#else
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time_t t;
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time(&t);
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return from_time_t(t);
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#endif
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}
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static inline int32_t now_jul(_Out_opt_ uint32_t* hour = nullptr) noexcept
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{
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#ifdef _WIN32
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SYSTEMTIME t;
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GetSystemTime(&t);
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duration tp = from_system(t).time_since_epoch();
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#else
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struct timespec t;
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clock_gettime(CLOCK_REALTIME, &t);
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duration tp = from_system(t).time_since_epoch();
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#endif
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if (hour)
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*hour = (uint32_t)(tp.count() % day);
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return (uint32_t)(tp.count() / day);
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}
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static int32_t gre2jul(_In_ uint8_t day, _In_ uint8_t month, _In_ int32_t year) noexcept
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{
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int32_t mtmp, ytmp;
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if (month > 2) {
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mtmp = month - 3;
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ytmp = year;
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}
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else {
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mtmp = month + 9;
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ytmp = year - 1;
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}
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int32_t ctmp = (ytmp / 100);
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int32_t dtmp = ytmp - (100 * ctmp);
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int32_t result1 = 146097L * ctmp / 4;
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int32_t result2 = (1461 * dtmp) / 4;
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int32_t result3 = (153 * mtmp + 2) / 5;
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return (int32_t)result1 + day + result2 + 1721119L + result3;
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}
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static void jul2gre(_In_ int32_t jul, _Out_opt_ uint8_t* day, _Out_opt_ uint8_t* month, _Out_opt_ int32_t* year) noexcept
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{
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int32_t mtmp = jul - 1721119L;
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int32_t yr = (4 * mtmp - 1) / 146097L;
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mtmp = 4 * mtmp - 1 - 146097L * yr;
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int32_t da = mtmp / 4;
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mtmp = (4 * da + 3) / 1461;
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da = 4 * da + 3 - 1461 * mtmp;
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da = (da + 4) / 4;
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int32_t mo = (5 * da - 3) / 153;
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da = 5 * da - 3 - 153 * mo;
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da = (da + 5) / 5;
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yr = 100 * yr + mtmp;
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if (mo < 10)
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mo += 3;
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else {
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mo -= 9;
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yr++;
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}
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if (day) *day = static_cast<uint8_t>(da);
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if (month) *month = static_cast<uint8_t>(mo);
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if (year) *year = yr;
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}
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static __time64_t to_time_t(_In_ const time_point& tp) noexcept
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{
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return tp.time_since_epoch().count() / second - 210866803200;
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}
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static time_point from_time_t(_In_ __time64_t t) noexcept
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{
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return time_point(duration(((rep)t + 210866803200) * second));
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}
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#ifdef _WIN32
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static time_point from_system(_In_ const SYSTEMTIME& t) noexcept
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{
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return time_point(duration(
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((rep)gre2jul((uint8_t)t.wDay, (uint8_t)t.wMonth, (int32_t)t.wYear)) * day +
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((rep)t.wHour * hour + (rep)t.wMinute * minute + (rep)t.wSecond * second + t.wMilliseconds)));
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}
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static time_point from_system(_In_ const FILETIME& t) noexcept
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{
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rep x = (((rep)t.dwHighDateTime) << 32) | t.dwLowDateTime;
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return time_point(duration(x / 10000 + 199222329600000)); // Convert from 100 ns to 1 ms interval and adjust epoch
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}
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static time_point from_system(_In_ DATE t)
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{
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SYSTEMTIME st;
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if (!VariantTimeToSystemTime(t, &st))
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throw std::invalid_argument("failed to convert date from VARIANT_DATE");
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return from_system(st);
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}
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#else
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static time_point from_system(_In_ const struct timespec& t) noexcept
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{
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return from_time_t(t.tv_sec) + t.tv_nsec / 1000;
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}
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#endif
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};
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}
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}
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