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* UptimeClock is a chrono-compatible seconds-precision clock. * Like UptimeTimer, its purpose is to make it possible for clients to query the uptime thousands of times per second without a significant performance hit. * UptimeClock decouples itself from LoadManager by managing its own once-per-second update loop. * Clients now traffic in chrono time_points and durations instead of int.
69 lines
2.1 KiB
C++
69 lines
2.1 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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#ifndef RIPPLE_BASICS_UPTIMETIMER_H_INCLUDED
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#define RIPPLE_BASICS_UPTIMETIMER_H_INCLUDED
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#include <atomic>
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#include <chrono>
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#include <ratio>
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#include <thread>
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namespace ripple {
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/** Tracks program uptime to seconds precision.
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The timer caches the current time as a performance optimization.
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This allows clients to query the current time thousands of times
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per second.
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*/
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class UptimeClock
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{
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public:
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using rep = int;
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using period = std::ratio<1>;
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using duration = std::chrono::duration<rep, period>;
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using time_point = std::chrono::time_point<UptimeClock>;
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static constexpr bool is_steady = std::chrono::system_clock::is_steady;
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explicit UptimeClock() = default;
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static time_point now(); // seconds since rippled program start
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private:
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static std::atomic<rep> now_;
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static std::atomic<bool> stop_;
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struct update_thread
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: private std::thread
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{
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~update_thread();
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update_thread(update_thread&&) = default;
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using std::thread::thread;
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};
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static update_thread start_clock();
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};
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} // ripple
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#endif
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