67 lines
974 B
C++
67 lines
974 B
C++
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// SleepResolutionBooster.h
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// Increases the accuracy of Sleep on Windows (GH #5140).
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// This file MUST NOT be included from anywhere other than main.cpp.
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#ifdef _WIN32
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#include <timeapi.h>
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static TIMECAPS g_Resolution;
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namespace SleepResolutionBooster
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{
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static void Register()
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{
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// Default sleep resolution on Windows isn't accurate enough (GH #5140) so try to boost it:
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if (
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(timeGetDevCaps(&g_Resolution, sizeof(g_Resolution)) == MMSYSERR_NOERROR) &&
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(timeBeginPeriod(g_Resolution.wPeriodMin) == MMSYSERR_NOERROR)
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)
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{
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return;
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}
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// Max < Min sentinel for failure, to prevent bogus timeEndPeriod calls:
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g_Resolution.wPeriodMax = 0;
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g_Resolution.wPeriodMin = 1;
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}
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static void Unregister()
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{
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if (g_Resolution.wPeriodMax >= g_Resolution.wPeriodMin)
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{
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timeEndPeriod(g_Resolution.wPeriodMin);
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}
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}
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};
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#else
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namespace SleepResolutionBooster
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{
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static void Register()
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{
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}
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static void Unregister()
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{
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}
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};
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#endif
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