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#include "monotonic.h"
#include <chrono>
#include <optional>
#include <util/system/platform.h>
#ifdef _linux
#include <time.h>
#include <string.h>
#endif
namespace NMonotonic {
namespace {
// Unfortunately time_since_epoch() is sometimes negative on wine
// Remember initial time point at program start and use offsets from that
std::chrono::steady_clock::time_point MonotonicOffset = std::chrono::steady_clock::now();
}
ui64 GetMonotonicMicroSeconds() {
auto microseconds = std::chrono::duration_cast<std::chrono::microseconds>(std::chrono::steady_clock::now() - MonotonicOffset).count();
// Steady clock is supposed to never jump backwards, but it's better to be safe in case of buggy implementations
if (Y_UNLIKELY(microseconds < 0)) {
microseconds = 0;
}
// Add one so we never return zero
return microseconds + 1;
}
#ifdef _linux_
namespace {
std::optional<ui64> GetClockBootTimeMicroSeconds() {
struct timespec t;
std::optional<ui64> r;
if (0 == ::clock_gettime(CLOCK_BOOTTIME, &t)) {
r.emplace(t.tv_nsec / 1000ULL + t.tv_sec * 1000000ULL);
}
return r;
}
// We want time relative to process start
std::optional<ui64> BootTimeOffset = GetClockBootTimeMicroSeconds();
}
ui64 GetBootTimeMicroSeconds() {
if (Y_UNLIKELY(!BootTimeOffset)) {
return GetMonotonicMicroSeconds();
}
auto r = GetClockBootTimeMicroSeconds();
Y_VERIFY(r, "Unexpected clock_gettime(CLOCK_BOOTTIME) failure: %s", strerror(errno));
return *r - *BootTimeOffset + 1;
}
#else
ui64 GetBootTimeMicroSeconds() {
return GetMonotonicMicroSeconds();
}
#endif
}
template <>
void Out<NMonotonic::TMonotonic>(
IOutputStream& o,
NMonotonic::TMonotonic t)
{
o << t - NMonotonic::TMonotonic::Zero();
}
template <>
void Out<NMonotonic::TBootTime>(
IOutputStream& o,
NMonotonic::TBootTime t)
{
o << t - NMonotonic::TBootTime::Zero();
}
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