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#pragma once
#include "common.h"
#include <util/system/datetime.h>
namespace NYT::NHRTimer {
////////////////////////////////////////////////////////////////////////////////
// Returns CPU internal cycle counter.
// On modern systems, cycle counters are consistent across cores and cycle rate
// can be considered constant for practical purposes.
Y_FORCE_INLINE ui64 GetRdtsc()
{
return GetCycleCount();
}
// Represents an offset from an arbitrary point in the past;
// it should be used only for relative measurements.
struct THRInstant
{
i64 Seconds;
i64 Nanoseconds;
};
// Represents a duration in nano-seconds.
using THRDuration = ui64;
#ifdef _linux_
static_assert(
sizeof(THRInstant) == sizeof(struct timespec),
"THRInstant should be ABI-compatible with struct timespec");
static_assert(
offsetof(THRInstant, Seconds) == offsetof(struct timespec, tv_sec),
"THRInstant should be ABI-compatible with struct timespec");
static_assert(
offsetof(THRInstant, Nanoseconds) == offsetof(struct timespec, tv_nsec),
"THRInstant should be ABI-compatible with struct timespec");
#endif
// Returns instant.
void GetHRInstant(THRInstant* instant);
// Returns time difference in nanoseconds.
THRDuration GetHRDuration(const THRInstant& begin, const THRInstant& end);
// Returns instant resolution.
THRDuration GetHRResolution();
////////////////////////////////////////////////////////////////////////////////
} // namespace NYT::NHRTimer
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