106 lines
2.6 KiB
C++
106 lines
2.6 KiB
C++
/*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*
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* Copyright 2010-2016 Danny Robson <danny@nerdcruft.net>
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*/
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#ifndef __UTIL_TIME_HPP
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#define __UTIL_TIME_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 util {
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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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float seconds (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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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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#endif
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