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125 lines
3.0 KiB
C
125 lines
3.0 KiB
C
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/*
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This file is part of TON Blockchain Library.
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TON Blockchain Library is free software: you can redistribute it and/or modify
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it under the terms of the GNU Lesser General Public License as published by
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the Free Software Foundation, either version 2 of the License, or
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(at your option) any later version.
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TON Blockchain Library is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU Lesser General Public License for more details.
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You should have received a copy of the GNU Lesser General Public License
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along with TON Blockchain Library. If not, see <http://www.gnu.org/licenses/>.
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Copyright 2017-2019 Telegram Systems LLP
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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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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() const {
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return at_ + 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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