libcruft-util/time.hpp

106 lines
2.6 KiB
C++

/*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*
* Copyright 2010-2016 Danny Robson <danny@nerdcruft.net>
*/
#ifndef __UTIL_TIME_HPP
#define __UTIL_TIME_HPP
#include "stats.hpp"
#include <chrono>
#include <cstdint>
#include <string>
namespace util {
///////////////////////////////////////////////////////////////////////////
uintmax_t nanoseconds (void);
//-------------------------------------------------------------------------
template <typename T>
void sleep (std::chrono::duration<T,std::nano> dt)
{
auto nano = std::chrono::duration_cast<std::chrono::nanoseconds> (dt);
sleep (nano.count ());
}
//-------------------------------------------------------------------------
void sleep (uint64_t ns);
///////////////////////////////////////////////////////////////////////////
class delta_clock {
public:
delta_clock ();
float seconds (void);
protected:
struct {
uint64_t prev;
uint64_t curr;
} time;
};
///////////////////////////////////////////////////////////////////////////
class period_query {
public:
explicit period_query (float seconds);
bool poll (void);
protected:
struct {
uint64_t start;
uint64_t period;
} m_time;
};
///////////////////////////////////////////////////////////////////////////
class rate_limiter {
public:
explicit rate_limiter (unsigned rate);
void poll (void);
protected:
uint64_t m_last;
unsigned m_target;
};
///////////////////////////////////////////////////////////////////////////
class polled_duration {
public:
polled_duration (std::string name, uint64_t interval);
void start (void);
void stop (void);
protected:
std::string m_name;
uint64_t m_last;
uint64_t m_interval;
uint64_t m_next;
stats::accumulator<uint64_t> m_series;
};
}
#endif