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3e152fec74
This change refactors the codebase to use the "east const convention", and adds a clang-format rule to follow this convention.
77 lines
2.4 KiB
C++
77 lines
2.4 KiB
C++
//------------------------------------------------------------------------------
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/*
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This file is part of rippled: https://github.com/ripple/rippled
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Copyright (c) 2012, 2013 Ripple Labs Inc.
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Permission to use, copy, modify, and/or distribute this software for any
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purpose with or without fee is hereby granted, provided that the above
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copyright notice and this permission notice appear in all copies.
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THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
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WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
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MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
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ANY SPECIAL , DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
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WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
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ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
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OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
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*/
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//==============================================================================
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#include <xrpl/basics/UptimeClock.h>
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#include <atomic>
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#include <chrono>
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#include <thread>
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namespace ripple {
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std::atomic<UptimeClock::rep> UptimeClock::now_{0}; // seconds since start
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std::atomic<bool> UptimeClock::stop_{false}; // stop update thread
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// On rippled shutdown, cancel and wait for the update thread
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UptimeClock::update_thread::~update_thread()
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{
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if (joinable())
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{
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stop_ = true;
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// This join() may take up to a 1s, but happens only
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// once at rippled shutdown.
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join();
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}
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}
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// Launch the update thread
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UptimeClock::update_thread
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UptimeClock::start_clock()
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{
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return update_thread{[] {
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using namespace std;
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using namespace std::chrono;
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// Wake up every second and update now_
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auto next = system_clock::now() + 1s;
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while (!stop_)
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{
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this_thread::sleep_until(next);
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next += 1s;
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++now_;
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}
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}};
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}
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// This actually measures time since first use, instead of since rippled start.
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// However the difference between these two epochs is a small fraction of a
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// second and unimportant.
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UptimeClock::time_point
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UptimeClock::now()
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{
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// start the update thread on first use
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static auto const init = start_clock();
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// Return the number of seconds since rippled start
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return time_point{duration{now_}};
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}
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} // namespace ripple
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