mirror of
https://github.com/matrix-construct/construct
synced 2024-11-18 07:50:57 +01:00
106 lines
2.4 KiB
C++
106 lines
2.4 KiB
C++
// Matrix Construct
|
|
//
|
|
// Copyright (C) Matrix Construct Developers, Authors & Contributors
|
|
// Copyright (C) 2016-2018 Jason Volk <jason@zemos.net>
|
|
//
|
|
// Permission to use, copy, modify, and/or distribute this software for any
|
|
// purpose with or without fee is hereby granted, provided that the above
|
|
// copyright notice and this permission notice is present in all copies. The
|
|
// full license for this software is available in the LICENSE file.
|
|
|
|
#pragma once
|
|
#define HAVE_IRCD_UTIL_TIMER_H
|
|
|
|
namespace ircd {
|
|
inline namespace util
|
|
{
|
|
struct timer;
|
|
}}
|
|
|
|
/// Stopwatch w/ accumulation.
|
|
///
|
|
/// This utility can be used to gauge the duration of something. The clock
|
|
/// is started by default upon construction. Users can query the running time
|
|
/// using the at(), or using the pretty() convenience.
|
|
///
|
|
/// This timer features an accumulator state so the clock can be stopped and
|
|
/// continued, and each time the accumulator is updated. The accumulator
|
|
/// value is always added into results: when the timer is stopped, the result
|
|
/// is simply the accumulator value; when the clock is running, the result is
|
|
/// the accumulator value added to the difference of the current time and the
|
|
/// last start time.
|
|
///
|
|
/// One can instantiate the timer without starting the clock with the `nostart`
|
|
/// overload. Additionally, a lambda constructor will accumulate the time it
|
|
/// takes to execute the provided function.
|
|
struct ircd::util::timer
|
|
{
|
|
using clock = std::chrono::steady_clock;
|
|
IRCD_OVERLOAD(nostart)
|
|
|
|
nanoseconds accumulator
|
|
{
|
|
0ns
|
|
};
|
|
|
|
clock::time_point start
|
|
{
|
|
clock::now()
|
|
};
|
|
|
|
// Observers
|
|
bool stopped() const;
|
|
template<class duration = std::chrono::seconds> duration at() const;
|
|
|
|
// Convenience wrapper for util::pretty()
|
|
string_view pretty(const mutable_buffer &out, const int &fmt = 0) const;
|
|
std::string pretty(const int &fmt = 0) const;
|
|
|
|
// Control
|
|
void cont();
|
|
void stop();
|
|
|
|
timer(const std::function<void ()> &);
|
|
timer(nostart_t);
|
|
timer() = default;
|
|
};
|
|
|
|
inline
|
|
ircd::util::timer::timer(nostart_t)
|
|
:start
|
|
{
|
|
clock::time_point::min()
|
|
}
|
|
{}
|
|
|
|
template<class duration>
|
|
inline duration
|
|
ircd::util::timer::at()
|
|
const
|
|
{
|
|
const auto now
|
|
{
|
|
!stopped()?
|
|
clock::now():
|
|
start
|
|
};
|
|
|
|
const auto elapsed
|
|
{
|
|
duration_cast<decltype(accumulator)>(now - start)
|
|
};
|
|
|
|
const auto accumulator
|
|
{
|
|
this->accumulator + elapsed
|
|
};
|
|
|
|
return duration_cast<duration>(accumulator);
|
|
}
|
|
|
|
inline bool
|
|
ircd::util::timer::stopped()
|
|
const
|
|
{
|
|
return start == clock::time_point::min();
|
|
}
|