/usr/include/kj/time.h is in libcapnp-dev 0.5.3-2ubuntu1.1.
This file is owned by root:root, with mode 0o644.
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// Copyright (c) 2013-2014 Sandstorm Development Group, Inc. and contributors
// Licensed under the MIT License:
//
// Permission is hereby granted, free of charge, to any person obtaining a copy
// of this software and associated documentation files (the "Software"), to deal
// in the Software without restriction, including without limitation the rights
// to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
// copies of the Software, and to permit persons to whom the Software is
// furnished to do so, subject to the following conditions:
//
// The above copyright notice and this permission notice shall be included in
// all copies or substantial portions of the Software.
//
// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
// FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
// AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
// LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
// OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
// THE SOFTWARE.
#ifndef KJ_TIME_H_
#define KJ_TIME_H_
#if defined(__GNUC__) && !KJ_HEADER_WARNINGS
#pragma GCC system_header
#endif
#include "async.h"
#include "units.h"
#include <inttypes.h>
namespace kj {
namespace _ { // private
class NanosecondLabel;
class TimeLabel;
class DateLabel;
} // namespace _ (private)
using Duration = Quantity<int64_t, _::NanosecondLabel>;
// A time value, in microseconds.
constexpr Duration NANOSECONDS = unit<Duration>();
constexpr Duration MICROSECONDS = 1000 * NANOSECONDS;
constexpr Duration MILLISECONDS = 1000 * MICROSECONDS;
constexpr Duration SECONDS = 1000 * MILLISECONDS;
constexpr Duration MINUTES = 60 * SECONDS;
constexpr Duration HOURS = 60 * MINUTES;
constexpr Duration DAYS = 24 * HOURS;
using TimePoint = Absolute<Duration, _::TimeLabel>;
// An absolute time measured by some particular instance of `Timer`. `Time`s from two different
// `Timer`s may be measured from different origins and so are not necessarily compatible.
using Date = Absolute<Duration, _::DateLabel>;
// A point in real-world time, measured relative to the Unix epoch (Jan 1, 1970 00:00:00 UTC).
constexpr Date UNIX_EPOCH = origin<Date>();
// The `Date` representing Jan 1, 1970 00:00:00 UTC.
class Timer {
// Interface to time and timer functionality.
//
// Each `Timer` may have a different origin, and some `Timer`s may in fact tick at a different
// rate than real time (e.g. a `Timer` could represent CPU time consumed by a thread). However,
// all `Timer`s are monotonic: time will never appear to move backwards, even if the calendar
// date as tracked by the system is manually modified.
public:
virtual TimePoint now() = 0;
// Returns the current value of a clock that moves steadily forward, independent of any
// changes in the wall clock. The value is updated every time the event loop waits,
// and is constant in-between waits.
virtual Promise<void> atTime(TimePoint time) = 0;
// Returns a promise that returns as soon as now() >= time.
virtual Promise<void> afterDelay(Duration delay) = 0;
// Equivalent to atTime(now() + delay).
template <typename T>
Promise<T> timeoutAt(TimePoint time, Promise<T>&& promise);
// Return a promise equivalent to `promise` but which throws an exception (and cancels the
// original promise) if it hasn't completed by `time`. The thrown exception is of type
// "OVERLOADED".
template <typename T>
Promise<T> timeoutAfter(Duration delay, Promise<T>&& promise);
// Return a promise equivalent to `promise` but which throws an exception (and cancels the
// original promise) if it hasn't completed after `delay` from now. The thrown exception is of
// type "OVERLOADED".
private:
static kj::Exception makeTimeoutException();
};
// =======================================================================================
// inline implementation details
template <typename T>
Promise<T> Timer::timeoutAt(TimePoint time, Promise<T>&& promise) {
return promise.exclusiveJoin(atTime(time).then([]() -> kj::Promise<T> {
return makeTimeoutException();
}));
}
template <typename T>
Promise<T> Timer::timeoutAfter(Duration delay, Promise<T>&& promise) {
return promise.exclusiveJoin(afterDelay(delay).then([]() -> kj::Promise<T> {
return makeTimeoutException();
}));
}
} // namespace kj
#endif // KJ_TIME_H_
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