205 lines
6.3 KiB
C++
205 lines
6.3 KiB
C++
/*
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* Copyright (c) Facebook, Inc. and its affiliates.
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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#pragma once
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#include <chrono>
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#include <stdexcept>
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#include <type_traits>
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#include <folly/Portability.h>
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#include <folly/lang/Exception.h>
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#include <folly/portability/Time.h>
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/***
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* include or backport:
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* * std::chrono::ceil
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* * std::chrono::floor
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* * std::chrono::round
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*/
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#if __cpp_lib_chrono >= 201510 || _LIBCPP_STD_VER > 14 || _MSC_VER
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namespace folly {
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namespace chrono {
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/* using override */ using std::chrono::abs;
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/* using override */ using std::chrono::ceil;
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/* using override */ using std::chrono::floor;
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/* using override */ using std::chrono::round;
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} // namespace chrono
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} // namespace folly
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#else
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namespace folly {
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namespace chrono {
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namespace detail {
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// from: http://en.cppreference.com/w/cpp/chrono/duration/ceil, CC-BY-SA
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template <typename T>
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struct is_duration : std::false_type {};
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template <typename Rep, typename Period>
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struct is_duration<std::chrono::duration<Rep, Period>> : std::true_type {};
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template <typename To, typename Duration>
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constexpr To ceil_impl(Duration const& d, To const& t) {
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return t < d ? t + To{1} : t;
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}
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template <typename To, typename Duration>
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constexpr To floor_impl(Duration const& d, To const& t) {
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return t > d ? t - To{1} : t;
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}
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template <typename To, typename Diff>
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constexpr To round_impl(To const& t0, To const& t1, Diff diff0, Diff diff1) {
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return diff0 < diff1 ? t0 : diff1 < diff0 ? t1 : t0.count() & 1 ? t1 : t0;
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}
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template <typename To, typename Duration>
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constexpr To round_impl(Duration const& d, To const& t0, To const& t1) {
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return round_impl(t0, t1, d - t0, t1 - d);
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}
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template <typename To, typename Duration>
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constexpr To round_impl(Duration const& d, To const& t0) {
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return round_impl(d, t0, t0 + To{1});
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}
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} // namespace detail
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// mimic: std::chrono::abs, C++17
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template <
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typename Rep,
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typename Period,
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typename = typename std::enable_if<
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std::chrono::duration<Rep, Period>::min() <
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std::chrono::duration<Rep, Period>::zero()>::type>
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constexpr std::chrono::duration<Rep, Period> abs(
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std::chrono::duration<Rep, Period> const& d) {
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return d < std::chrono::duration<Rep, Period>::zero() ? -d : d;
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}
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// mimic: std::chrono::ceil, C++17
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// from: http://en.cppreference.com/w/cpp/chrono/duration/ceil, CC-BY-SA
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template <
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typename To,
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typename Rep,
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typename Period,
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typename = typename std::enable_if<detail::is_duration<To>::value>::type>
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constexpr To ceil(std::chrono::duration<Rep, Period> const& d) {
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return detail::ceil_impl(d, std::chrono::duration_cast<To>(d));
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}
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// mimic: std::chrono::ceil, C++17
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// from: http://en.cppreference.com/w/cpp/chrono/time_point/ceil, CC-BY-SA
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template <
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typename To,
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typename Clock,
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typename Duration,
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typename = typename std::enable_if<detail::is_duration<To>::value>::type>
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constexpr std::chrono::time_point<Clock, To> ceil(
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std::chrono::time_point<Clock, Duration> const& tp) {
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return std::chrono::time_point<Clock, To>{ceil<To>(tp.time_since_epoch())};
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}
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// mimic: std::chrono::floor, C++17
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// from: http://en.cppreference.com/w/cpp/chrono/duration/floor, CC-BY-SA
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template <
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typename To,
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typename Rep,
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typename Period,
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typename = typename std::enable_if<detail::is_duration<To>::value>::type>
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constexpr To floor(std::chrono::duration<Rep, Period> const& d) {
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return detail::floor_impl(d, std::chrono::duration_cast<To>(d));
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}
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// mimic: std::chrono::floor, C++17
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// from: http://en.cppreference.com/w/cpp/chrono/time_point/floor, CC-BY-SA
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template <
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typename To,
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typename Clock,
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typename Duration,
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typename = typename std::enable_if<detail::is_duration<To>::value>::type>
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constexpr std::chrono::time_point<Clock, To> floor(
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std::chrono::time_point<Clock, Duration> const& tp) {
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return std::chrono::time_point<Clock, To>{floor<To>(tp.time_since_epoch())};
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}
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// mimic: std::chrono::round, C++17
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// from: http://en.cppreference.com/w/cpp/chrono/duration/round, CC-BY-SA
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template <
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typename To,
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typename Rep,
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typename Period,
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typename = typename std::enable_if<
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detail::is_duration<To>::value &&
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!std::chrono::treat_as_floating_point<typename To::rep>::value>::type>
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constexpr To round(std::chrono::duration<Rep, Period> const& d) {
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return detail::round_impl(d, floor<To>(d));
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}
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// mimic: std::chrono::round, C++17
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// from: http://en.cppreference.com/w/cpp/chrono/time_point/round, CC-BY-SA
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template <
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typename To,
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typename Clock,
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typename Duration,
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typename = typename std::enable_if<
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detail::is_duration<To>::value &&
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!std::chrono::treat_as_floating_point<typename To::rep>::value>::type>
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constexpr std::chrono::time_point<Clock, To> round(
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std::chrono::time_point<Clock, Duration> const& tp) {
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return std::chrono::time_point<Clock, To>{round<To>(tp.time_since_epoch())};
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}
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} // namespace chrono
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} // namespace folly
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#endif
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namespace folly {
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namespace chrono {
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struct coarse_steady_clock {
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using rep = std::chrono::milliseconds::rep;
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using period = std::chrono::milliseconds::period;
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using duration = std::chrono::duration<rep, period>;
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using time_point = std::chrono::time_point<coarse_steady_clock, duration>;
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constexpr static bool is_steady = true;
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static time_point now() noexcept {
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#ifndef CLOCK_MONOTONIC_COARSE
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return time_point(std::chrono::duration_cast<duration>(
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std::chrono::steady_clock::now().time_since_epoch()));
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#else
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timespec ts;
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auto ret = clock_gettime(CLOCK_MONOTONIC_COARSE, &ts);
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if (kIsDebug && (ret != 0)) {
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throw_exception<std::runtime_error>(
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"Error using CLOCK_MONOTONIC_COARSE.");
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}
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return time_point(std::chrono::duration_cast<duration>(
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std::chrono::seconds(ts.tv_sec) +
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std::chrono::nanoseconds(ts.tv_nsec)));
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#endif
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}
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};
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} // namespace chrono
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} // namespace folly
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