115 lines
2.5 KiB
C++
115 lines
2.5 KiB
C++
//
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// Copyright Aliaksei Levin (levlam@telegram.org), Arseny Smirnov (arseny30@gmail.com) 2014-2019
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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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namespace td {
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class Time {
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public:
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static double now();
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static double now_cached() {
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// Temporary(?) use now in now_cached
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// Problem:
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// thread A: check that now() > timestamp and notifies thread B
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// thread B: must see that now() > timestamp()
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//
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// now() and now_cached() must be monotonic
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//
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// if a=now[_cached]() happens before b=now[_cached] than
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// a <= b
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//
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// As an alternative we may say that now_cached is a thread local copy of now
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return now();
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}
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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 at_unix(double timeout) {
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return Timestamp{timeout - td::Clocks::system() + Time::now()};
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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 at_unix() {
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return at_ + td::Clocks::system() - Time::now();
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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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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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template <class StorerT>
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void store(const Timestamp ×tamp, StorerT &storer) {
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storer.store_binary(timestamp.at() - Time::now() + Clocks::system());
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}
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template <class ParserT>
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void parse(Timestamp ×tamp, ParserT &parser) {
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timestamp = Timestamp::in(parser.fetch_double() - Clocks::system());
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}
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} // namespace td
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