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steady_clock: Introduce a real time clock

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Morph 2023-03-04 22:59:04 -05:00
parent dcd13a7566
commit 6f9918552c
2 changed files with 36 additions and 0 deletions
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25
src/common/steady_clock.cpp
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@ -23,6 +23,19 @@ static s64 WindowsQueryPerformanceCounter() {
QueryPerformanceCounter(&counter);
return counter.QuadPart;
}
static s64 GetSystemTimeNS() {
// GetSystemTimePreciseAsFileTime returns the file time in 100ns units.
static constexpr s64 Multiplier = 100;
// Convert Windows epoch to Unix epoch.
static constexpr s64 WindowsEpochToUnixEpochNS = 0x19DB1DED53E8000LL;
FILETIME filetime;
GetSystemTimePreciseAsFileTime(&filetime);
return Multiplier * ((static_cast<s64>(filetime.dwHighDateTime) << 32) +
static_cast<s64>(filetime.dwLowDateTime)) -
WindowsEpochToUnixEpochNS;
}
#endif
SteadyClock::time_point SteadyClock::Now() noexcept {
@ -53,4 +66,16 @@ SteadyClock::time_point SteadyClock::Now() noexcept {
#endif
}
RealTimeClock::time_point RealTimeClock::Now() noexcept {
#if defined(_WIN32)
return time_point{duration{GetSystemTimeNS()}};
#elif defined(__APPLE__)
return time_point{duration{clock_gettime_nsec_np(CLOCK_REALTIME)}};
#else
timespec ts;
clock_gettime(CLOCK_REALTIME, &ts);
return time_point{std::chrono::seconds{ts.tv_sec} + std::chrono::nanoseconds{ts.tv_nsec}};
#endif
}
}; // namespace Common

11
src/common/steady_clock.h
View file

@ -20,4 +20,15 @@ struct SteadyClock {
[[nodiscard]] static time_point Now() noexcept;
};
struct RealTimeClock {
using rep = s64;
using period = std::nano;
using duration = std::chrono::nanoseconds;
using time_point = std::chrono::time_point<RealTimeClock>;
static constexpr bool is_steady = false;
[[nodiscard]] static time_point Now() noexcept;
};
} // namespace Common