119 lines
3.0 KiB
C++
119 lines
3.0 KiB
C++
/*
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* This Source Code Form is subject to the terms of the Mozilla Public
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* License, v. 2.0. If a copy of the MPL was not distributed with this
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* file, You can obtain one at http://mozilla.org/MPL/2.0/.
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*
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* Copyright 2010-2016, 2022 Danny Robson <danny@nerdcruft.net>
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*/
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#pragma once
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#include "./std.hpp"
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#include "./stats.hpp"
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#include <chrono>
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#include <cstdint>
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#include <string>
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namespace cruft {
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///////////////////////////////////////////////////////////////////////////
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uintmax_t nanoseconds (void);
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//-------------------------------------------------------------------------
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template <typename T>
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void sleep (std::chrono::duration<T,std::nano> dt)
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{
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auto nano = std::chrono::duration_cast<std::chrono::nanoseconds> (dt);
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sleep (nano.count ());
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}
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//-------------------------------------------------------------------------
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void sleep (uint64_t ns);
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///////////////////////////////////////////////////////////////////////////
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class delta_clock {
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public:
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delta_clock ();
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std::chrono::nanoseconds dt(void);
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protected:
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struct {
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uint64_t prev;
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uint64_t curr;
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} time;
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};
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///////////////////////////////////////////////////////////////////////////
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class period_query {
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public:
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explicit period_query (float seconds);
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bool poll (void);
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protected:
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struct {
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uint64_t start;
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uint64_t period;
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} m_time;
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};
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///////////////////////////////////////////////////////////////////////////
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class rate_limiter {
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public:
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explicit rate_limiter (unsigned rate);
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void poll (void);
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protected:
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uint64_t m_last;
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unsigned m_target;
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};
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///////////////////////////////////////////////////////////////////////////
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/// Ensured to ensure a minimum period has elapsed since a previous
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/// invocation.
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class period_limiter {
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public:
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explicit period_limiter (std::chrono::nanoseconds _period);
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explicit period_limiter (u64);
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/// Wait until the period has elapsed and reset the last activation
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/// time.
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void poll (void);
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/// Wait until the period has elapsed. Does not reset the last
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/// activation time.
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void wait (void) const;
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/// Reset the last activated time. Does not block.
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void reset (void);
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private:
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u64 m_period;
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u64 m_prev;
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};
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///////////////////////////////////////////////////////////////////////////
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class polled_duration {
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public:
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polled_duration (std::string name, uint64_t interval);
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void start (void);
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void stop (void);
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protected:
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std::string m_name;
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uint64_t m_last;
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uint64_t m_interval;
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uint64_t m_next;
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stats::accumulator<uint64_t> m_series;
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};
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}
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