50 lines
1.2 KiB
C++
50 lines
1.2 KiB
C++
//
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// Copyright Aliaksei Levin (levlam@telegram.org), Arseny Smirnov (arseny30@gmail.com) 2014-2024
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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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#include "td/utils/Time.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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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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static std::atomic<double> time_diff;
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double Time::now() {
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auto result = now_unadjusted() + time_diff.load(std::memory_order_relaxed);
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while (result < 0) {
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auto old_time_diff = time_diff.load();
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time_diff.compare_exchange_strong(old_time_diff, old_time_diff - result);
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result = now_unadjusted() + time_diff.load(std::memory_order_relaxed);
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}
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return result;
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}
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double Time::now_unadjusted() {
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return Clocks::monotonic();
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}
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void Time::jump_in_future(double at) {
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while (true) {
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auto old_time_diff = time_diff.load();
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auto diff = at - now();
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if (diff < 0) {
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return;
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}
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if (time_diff.compare_exchange_strong(old_time_diff, old_time_diff + diff)) {
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return;
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}
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}
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}
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} // namespace td
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