89 lines
2.7 KiB
C
89 lines
2.7 KiB
C
|
/*
|
||
|
|
* Copyright 2022 The Android Open Source Project
|
||
|
|
*
|
||
|
|
* 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.
|
||
|
|
*/
|
||
|
|
|
||
|
|
#pragma once
|
||
|
|
|
||
|
|
#include <chrono>
|
||
|
|
#include <string>
|
||
|
|
|
||
|
|
#include <android-base/stringprintf.h>
|
||
|
|
#include <utils/Timers.h>
|
||
|
|
|
||
|
|
namespace android {
|
||
|
|
namespace scheduler {
|
||
|
|
|
||
|
|
// TODO(b/185535769): Pull Clock.h to libscheduler to reuse this.
|
||
|
|
using SchedulerClock = std::chrono::steady_clock;
|
||
|
|
static_assert(SchedulerClock::is_steady);
|
||
|
|
|
||
|
|
} // namespace scheduler
|
||
|
|
|
||
|
|
struct Duration;
|
||
|
|
|
||
|
|
struct TimePoint : scheduler::SchedulerClock::time_point {
|
||
|
|
constexpr TimePoint() = default;
|
||
|
|
explicit constexpr TimePoint(const Duration&);
|
||
|
|
|
||
|
|
// Implicit conversion from std::chrono counterpart.
|
||
|
|
constexpr TimePoint(scheduler::SchedulerClock::time_point p)
|
||
|
|
: scheduler::SchedulerClock::time_point(p) {}
|
||
|
|
|
||
|
|
static constexpr TimePoint fromNs(nsecs_t);
|
||
|
|
|
||
|
|
static TimePoint now() { return scheduler::SchedulerClock::now(); };
|
||
|
|
|
||
|
|
nsecs_t ns() const;
|
||
|
|
};
|
||
|
|
|
||
|
|
struct Duration : TimePoint::duration {
|
||
|
|
// Implicit conversion from std::chrono counterpart.
|
||
|
|
template <typename R, typename P>
|
||
|
|
constexpr Duration(std::chrono::duration<R, P> d) : TimePoint::duration(d) {}
|
||
|
|
|
||
|
|
static constexpr Duration fromNs(nsecs_t ns) { return {std::chrono::nanoseconds(ns)}; }
|
||
|
|
|
||
|
|
nsecs_t ns() const { return std::chrono::nanoseconds(*this).count(); }
|
||
|
|
};
|
||
|
|
|
||
|
|
using Period = Duration;
|
||
|
|
|
||
|
|
constexpr TimePoint::TimePoint(const Duration& d) : scheduler::SchedulerClock::time_point(d) {}
|
||
|
|
|
||
|
|
constexpr TimePoint TimePoint::fromNs(nsecs_t ns) {
|
||
|
|
return TimePoint(Duration::fromNs(ns));
|
||
|
|
}
|
||
|
|
|
||
|
|
inline nsecs_t TimePoint::ns() const {
|
||
|
|
return Duration(time_since_epoch()).ns();
|
||
|
|
}
|
||
|
|
|
||
|
|
// Shorthand to convert the tick count of a Duration to Period and Rep. For example:
|
||
|
|
//
|
||
|
|
// const auto i = ticks<std::ratio<1>>(d); // Integer seconds.
|
||
|
|
// const auto f = ticks<std::milli, float>(d); // Floating-point milliseconds.
|
||
|
|
//
|
||
|
|
template <typename Period, typename Rep = Duration::rep>
|
||
|
|
constexpr Rep ticks(Duration d) {
|
||
|
|
using D = std::chrono::duration<Rep, Period>;
|
||
|
|
return std::chrono::duration_cast<D>(d).count();
|
||
|
|
}
|
||
|
|
|
||
|
|
inline std::string to_string(Duration d) {
|
||
|
|
return base::StringPrintf("%.3f ms", ticks<std::milli, float>(d));
|
||
|
|
}
|
||
|
|
|
||
|
|
} // namespace android
|