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/*
* This file is open source software, licensed to you under the terms
* of the Apache License, Version 2.0 (the "License"). See the NOTICE file
* distributed with this work for additional information regarding copyright
* ownership. 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 (C) 2015 Cloudius Systems, Ltd.
*/
#pragma once
#include <chrono>
#include <functional>
#include <seastar/core/abort_source.hh>
#include <seastar/core/future.hh>
#include <seastar/core/lowres_clock.hh>
#include <seastar/core/timer.hh>
namespace seastar {
/// \file
/// Returns a future which completes after a specified time has elapsed.
///
/// \param dur minimum amount of time before the returned future becomes
/// ready.
/// \return A \ref future which becomes ready when the sleep duration elapses.
template <typename Clock = steady_clock_type, typename Rep, typename Period>
future<> sleep(std::chrono::duration<Rep, Period> dur) {
struct sleeper {
promise<> done;
timer<Clock> tmr;
sleeper(std::chrono::duration<Rep, Period> dur)
: tmr([this] { done.set_value(); })
{
tmr.arm(dur);
}
};
sleeper *s = new sleeper(dur);
future<> fut = s->done.get_future();
return fut.then([s] { delete s; });
}
/// exception that is thrown when application is in process of been stopped
class sleep_aborted : public std::exception {
public:
/// Reports the exception reason.
virtual const char* what() const noexcept {
return "Sleep is aborted";
}
};
/// Returns a future which completes after a specified time has elapsed
/// or throws \ref sleep_aborted exception if application is aborted
///
/// \param dur minimum amount of time before the returned future becomes
/// ready.
/// \return A \ref future which becomes ready when the sleep duration elapses.
template <typename Clock = steady_clock_type>
future<> sleep_abortable(typename Clock::duration dur);
extern template future<> sleep_abortable<steady_clock_type>(typename steady_clock_type::duration);
extern template future<> sleep_abortable<lowres_clock>(typename lowres_clock::duration);
/// Returns a future which completes after a specified time has elapsed
/// or throws \ref sleep_aborted exception if the sleep is aborted.
///
/// \param dur minimum amount of time before the returned future becomes
/// ready.
/// \param as the \ref abort_source that eventually notifies that the sleep
/// should be aborted.
/// \return A \ref future which becomes ready when the sleep duration elapses.
template <typename Clock = steady_clock_type>
future<> sleep_abortable(typename Clock::duration dur, abort_source& as);
extern template future<> sleep_abortable<steady_clock_type>(typename steady_clock_type::duration, abort_source&);
extern template future<> sleep_abortable<lowres_clock>(typename lowres_clock::duration, abort_source&);
}
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