76 lines
1.9 KiB
C++
76 lines
1.9 KiB
C++
/*
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* Copyright 2003-2020 The Music Player Daemon Project
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* http://www.musicpd.org
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License along
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* with this program; if not, write to the Free Software Foundation, Inc.,
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* 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
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*/
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#ifndef MPD_SOCKET_IDLE_EVENT_HXX
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#define MPD_SOCKET_IDLE_EVENT_HXX
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#include "util/BindMethod.hxx"
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#include <boost/intrusive/list_hook.hpp>
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class EventLoop;
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/**
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* An event that runs when the EventLoop has become idle, before
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* waiting for more events.
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*
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* This class is not thread-safe, all methods must be called from the
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* thread that runs the #EventLoop, except where explicitly documented
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* as thread-safe.
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*/
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class IdleEvent
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: public boost::intrusive::list_base_hook<>
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{
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friend class EventLoop;
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EventLoop &loop;
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using Callback = BoundMethod<void() noexcept>;
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const Callback callback;
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public:
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IdleEvent(EventLoop &_loop, Callback _callback) noexcept
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:loop(_loop), callback(_callback) {}
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~IdleEvent() noexcept {
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#ifndef NDEBUG
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/* this check is redundant, it is only here to avoid
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the assertion in Cancel() */
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if (IsActive())
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#endif
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Cancel();
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}
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EventLoop &GetEventLoop() const noexcept {
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return loop;
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}
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bool IsActive() const noexcept {
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return is_linked();
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}
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void Schedule() noexcept;
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void Cancel() noexcept;
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private:
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void Run() noexcept;
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};
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#endif
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