63 lines
1.8 KiB
C++
63 lines
1.8 KiB
C++
/*
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* Copyright 2003-2016 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_UPDATE_REMOVE_HXX
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#define MPD_UPDATE_REMOVE_HXX
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#include "check.h"
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#include "event/DeferredMonitor.hxx"
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#include "thread/Mutex.hxx"
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#include "thread/Cond.hxx"
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#include "Compiler.h"
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struct Song;
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class DatabaseListener;
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/**
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* This class handles #Song removal. It defers the action to the main
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* thread to ensure that all references to the #Song are gone.
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*/
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class UpdateRemoveService final : DeferredMonitor {
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DatabaseListener &listener;
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Mutex remove_mutex;
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Cond remove_cond;
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const Song *removed_song;
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public:
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UpdateRemoveService(EventLoop &_loop, DatabaseListener &_listener)
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:DeferredMonitor(_loop), listener(_listener),
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removed_song(nullptr){}
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/**
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* Sends a signal to the main thread which will in turn remove
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* the song: from the sticker database and from the playlist.
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* This serialized access is implemented to avoid excessive
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* locking.
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*/
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void Remove(const Song *song);
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private:
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/* virtual methods from class DeferredMonitor */
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virtual void RunDeferred() override;
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};
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#endif
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