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