98 lines
1.9 KiB
C++
98 lines
1.9 KiB
C++
//
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// Copyright Aliaksei Levin (levlam@telegram.org), Arseny Smirnov (arseny30@gmail.com) 2014-2018
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//
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// Distributed under the Boost Software License, Version 1.0. (See accompanying
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// file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)
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//
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#pragma once
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#include "td/utils/common.h"
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#include "td/utils/port/Clocks.h"
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#include <atomic>
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#include <cmath>
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namespace td {
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class Time {
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public:
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static double now() {
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double now = Clocks::monotonic();
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now_.store(now, std::memory_order_relaxed);
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return now;
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}
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static double now_cached() {
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return now_.load(std::memory_order_relaxed);
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}
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private:
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static std::atomic<double> now_;
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};
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inline void relax_timeout_at(double *timeout, double new_timeout) {
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if (new_timeout == 0) {
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return;
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}
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if (*timeout == 0 || new_timeout < *timeout) {
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*timeout = new_timeout;
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}
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}
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class Timestamp {
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public:
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Timestamp() = default;
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static Timestamp never() {
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return Timestamp{};
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}
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static Timestamp now() {
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return Timestamp{Time::now()};
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}
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static Timestamp now_cached() {
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return Timestamp{Time::now_cached()};
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}
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static Timestamp at(double timeout) {
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return Timestamp{timeout};
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}
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static Timestamp in(double timeout) {
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return Timestamp{Time::now_cached() + timeout};
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}
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bool is_in_past() const {
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return at_ <= Time::now_cached();
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}
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explicit operator bool() const {
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return at_ > 0;
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}
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double at() const {
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return at_;
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}
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double in() const {
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return at_ - Time::now_cached();
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}
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void relax(const Timestamp &timeout) {
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if (!timeout) {
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return;
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}
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if (!*this || at_ > timeout.at_) {
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at_ = timeout.at_;
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}
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}
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friend bool operator==(Timestamp a, Timestamp b) {
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return std::abs(a.at() - b.at()) < 1e-6;
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}
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private:
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double at_{0};
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explicit Timestamp(double timeout) : at_(timeout) {
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}
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};
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} // namespace td
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