mirror of
https://github.com/scylladb/scylladb.git
synced 2026-06-09 16:33:35 +00:00
0eb2eb1b44
Also add a comment to explain why it exists. Signed-off-by: Michael Livshin <michael.livshin@scylladb.com> Closes #9123
51 lines
1.5 KiB
C++
51 lines
1.5 KiB
C++
/*
|
|
* Copyright (C) 2021-present ScyllaDB
|
|
*/
|
|
|
|
/*
|
|
* This file is part of Scylla.
|
|
*
|
|
* Scylla is free software: you can redistribute it and/or modify
|
|
* it under the terms of the GNU Affero General Public License as published by
|
|
* the Free Software Foundation, either version 3 of the License, or
|
|
* (at your option) any later version.
|
|
*
|
|
* Scylla is distributed in the hope that it will be useful,
|
|
* but WITHOUT ANY WARRANTY; without even the implied warranty of
|
|
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
|
|
* GNU General Public License for more details.
|
|
*
|
|
* You should have received a copy of the GNU General Public License
|
|
* along with Scylla. If not, see <http://www.gnu.org/licenses/>.
|
|
*/
|
|
|
|
#pragma once
|
|
|
|
// A coarser and faster version of std::steady_clock, using
|
|
// CLOCK_MONOTONIC_COARSE instead of CLOCK_MONOTONIC.
|
|
//
|
|
// Intended for measuring time taken by synchronous code paths (where
|
|
// seastar::lowres_clock is not suitable).
|
|
|
|
#include <chrono>
|
|
#include <ctime>
|
|
|
|
namespace utils {
|
|
|
|
struct coarse_steady_clock {
|
|
using duration = std::chrono::nanoseconds;
|
|
using rep = duration::rep;
|
|
using period = duration::period;
|
|
using time_point = std::chrono::time_point<coarse_steady_clock, duration>;
|
|
|
|
static constexpr bool is_steady = true;
|
|
|
|
static time_point now() noexcept {
|
|
timespec tp;
|
|
clock_gettime(CLOCK_MONOTONIC_COARSE, &tp);
|
|
return time_point(std::chrono::seconds(tp.tv_sec) + std::chrono::nanoseconds(tp.tv_nsec));
|
|
};
|
|
};
|
|
|
|
};
|