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29 lines
1.0 KiB
C
29 lines
1.0 KiB
C
module std::time::os @if(WIN32_LIBC);
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import std::os::win32;
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extern fn void win32_GetSystemTimeAsFileTime(Win32_FILETIME* time) @extern("GetSystemTimeAsFileTime");
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extern fn Win32_BOOL win32_QueryPerformanceFrequency(Win32_LARGE_INTEGER* lpFrequency) @extern("QueryPerformanceFrequency");
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extern fn Win32_BOOL win32_QueryPerformanceCounter(Win32_LARGE_INTEGER* lpPerformanceCount) @extern("QueryPerformanceCounter");
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const ulong WINDOWS_TICK_US @local = 10;
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const ulong WIN_TO_UNIX_EPOCH_US @local = 116444736000000000u64 / WINDOWS_TICK_US;
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fn Clock native_clock()
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{
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static Win32_LARGE_INTEGER freq;
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if (!freq.quadPart)
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{
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if (!win32_QueryPerformanceFrequency(&freq)) return 0;
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}
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Win32_LARGE_INTEGER counter @noinit;
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if (!win32_QueryPerformanceCounter(&counter)) return 0;
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return (Clock)counter.quadPart;
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}
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fn Time native_timestamp()
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{
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Win32_FILETIME ft @noinit;
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win32_GetSystemTimeAsFileTime(&ft);
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ulong result = (ulong)ft.dwHighDateTime << 32 | ft.dwLowDateTime;
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return (Time)(result / WINDOWS_TICK_US - WIN_TO_UNIX_EPOCH_US);
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} |