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author | Morph <39850852+Morph1984@users.noreply.github.com> | 2023-03-05 04:59:04 +0100 |
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committer | Morph <39850852+Morph1984@users.noreply.github.com> | 2023-03-08 03:17:46 +0100 |
commit | 6f9918552c6a1d56a21fa544a7776cd1e5af7bc4 (patch) | |
tree | 4eebfe3a97560e36c2f2653a15633a24b8b17daf /src/common/steady_clock.cpp | |
parent | native_clock: Re-adjust the RDTSC frequency (diff) | |
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Diffstat (limited to '')
-rw-r--r-- | src/common/steady_clock.cpp | 25 |
1 files changed, 25 insertions, 0 deletions
diff --git a/src/common/steady_clock.cpp b/src/common/steady_clock.cpp index 0d5908aa7..782859196 100644 --- a/src/common/steady_clock.cpp +++ b/src/common/steady_clock.cpp @@ -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 |