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107 lines
2.8 KiB
C++
107 lines
2.8 KiB
C++
//------------------------------------------------------------------------------
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/*
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This file is part of Beast: https://github.com/vinniefalco/Beast
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Copyright 2021, Howard Hinnant <howard.hinnant@gmail.com>
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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 <ripple/beast/clock/basic_seconds_clock.h>
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#include <atomic>
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#include <cassert>
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#include <chrono>
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#include <condition_variable>
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#include <mutex>
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#include <thread>
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namespace beast {
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namespace {
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// Updates the clock
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class seconds_clock_thread
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{
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using Clock = basic_seconds_clock::Clock;
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bool stop_;
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std::mutex mut_;
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std::condition_variable cv_;
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std::thread thread_;
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std::atomic<Clock::time_point::rep> tp_;
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public:
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~seconds_clock_thread();
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seconds_clock_thread();
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Clock::time_point
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now();
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private:
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void
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run();
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};
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static_assert(std::atomic<std::chrono::steady_clock::rep>::is_always_lock_free);
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seconds_clock_thread::~seconds_clock_thread()
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{
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assert(thread_.joinable());
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{
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std::lock_guard lock(mut_);
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stop_ = true;
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} // publish stop_ asap so if waiting thread times-out, it will see it
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cv_.notify_one();
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thread_.join();
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}
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seconds_clock_thread::seconds_clock_thread()
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: stop_{false}, tp_{Clock::now().time_since_epoch().count()}
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{
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thread_ = std::thread(&seconds_clock_thread::run, this);
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}
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seconds_clock_thread::Clock::time_point
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seconds_clock_thread::now()
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{
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return Clock::time_point{Clock::duration{tp_.load()}};
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}
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void
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seconds_clock_thread::run()
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{
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std::unique_lock lock(mut_);
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while (true)
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{
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using namespace std::chrono;
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auto now = Clock::now();
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tp_ = now.time_since_epoch().count();
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auto const when = floor<seconds>(now) + 1s;
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if (cv_.wait_until(lock, when, [this] { return stop_; }))
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return;
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}
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}
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} // unnamed namespace
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basic_seconds_clock::time_point
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basic_seconds_clock::now()
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{
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static seconds_clock_thread clk;
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return clk.now();
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}
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} // namespace beast
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