73 lines
2.0 KiB
C++
73 lines
2.0 KiB
C++
/*
|
|
* Copyright 2003-2016 The Music Player Daemon Project
|
|
* http://www.musicpd.org
|
|
*
|
|
* This program is free software; you can redistribute it and/or modify
|
|
* it under the terms of the GNU General Public License as published by
|
|
* the Free Software Foundation; either version 2 of the License, or
|
|
* (at your option) any later version.
|
|
*
|
|
* This program is distributed in the hope that it will be useful,
|
|
* but WITHOUT ANY WARRANTY; without even the implied warranty of
|
|
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
|
|
* GNU General Public License for more details.
|
|
*
|
|
* You should have received a copy of the GNU General Public License along
|
|
* with this program; if not, write to the Free Software Foundation, Inc.,
|
|
* 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
|
|
*/
|
|
|
|
#ifndef MPD_EVENT_MASK_MONITOR_HXX
|
|
#define MPD_EVENT_MASK_MONITOR_HXX
|
|
|
|
#include "check.h"
|
|
#include "DeferredMonitor.hxx"
|
|
#include "util/BoundMethod.hxx"
|
|
|
|
#include <atomic>
|
|
|
|
/**
|
|
* Manage a bit mask of events that have occurred. Every time the
|
|
* mask becomes non-zero, OnMask() is called in #EventLoop's thread.
|
|
*
|
|
* This class is thread-safe.
|
|
*/
|
|
class MaskMonitor : DeferredMonitor {
|
|
std::atomic_uint pending_mask;
|
|
|
|
public:
|
|
explicit MaskMonitor(EventLoop &_loop)
|
|
:DeferredMonitor(_loop), pending_mask(0) {}
|
|
|
|
using DeferredMonitor::GetEventLoop;
|
|
using DeferredMonitor::Cancel;
|
|
|
|
void OrMask(unsigned new_mask);
|
|
|
|
protected:
|
|
virtual void HandleMask(unsigned mask) = 0;
|
|
|
|
/* virtual methode from class DeferredMonitor */
|
|
void RunDeferred() override;
|
|
};
|
|
|
|
/**
|
|
* A variant of #MaskMonitor which invokes a bound method.
|
|
*/
|
|
template<typename T>
|
|
class CallbackMaskMonitor final : public MaskMonitor {
|
|
BoundMethod<T, void, unsigned> callback;
|
|
|
|
public:
|
|
template<typename... Args>
|
|
explicit CallbackMaskMonitor(EventLoop &_loop, Args&&... args)
|
|
:MaskMonitor(_loop), callback(std::forward<Args>(args)...) {}
|
|
|
|
protected:
|
|
void HandleMask(unsigned mask) override {
|
|
callback(mask);
|
|
}
|
|
};
|
|
|
|
#endif
|