98 lines
2.2 KiB
C++
98 lines
2.2 KiB
C++
/*
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* Copyright (C) 2003-2013 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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#include "config.h"
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#include "GlobalEvents.hxx"
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#include "util/Manual.hxx"
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#include "event/DeferredMonitor.hxx"
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#include "Compiler.h"
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#include <atomic>
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#include <assert.h>
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namespace GlobalEvents {
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class Monitor final : public DeferredMonitor {
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public:
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Monitor(EventLoop &_loop):DeferredMonitor(_loop) {}
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protected:
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virtual void RunDeferred() override;
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};
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static Manual<Monitor> monitor;
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static std::atomic_uint flags;
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static Handler handlers[MAX];
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}
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/**
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* Invoke the callback for a certain event.
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*/
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static void
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InvokeGlobalEvent(GlobalEvents::Event event)
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{
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assert((unsigned)event < GlobalEvents::MAX);
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assert(GlobalEvents::handlers[event] != nullptr);
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GlobalEvents::handlers[event]();
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}
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void
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GlobalEvents::Monitor::RunDeferred()
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{
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const unsigned f = flags.exchange(0);
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for (unsigned i = 0; i < MAX; ++i)
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if (f & (1u << i))
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/* invoke the event handler */
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InvokeGlobalEvent(Event(i));
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}
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void
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GlobalEvents::Initialize(EventLoop &loop)
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{
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monitor.Construct(loop);
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}
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void
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GlobalEvents::Deinitialize()
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{
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monitor.Destruct();
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}
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void
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GlobalEvents::Register(Event event, Handler callback)
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{
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assert((unsigned)event < MAX);
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assert(handlers[event] == nullptr);
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handlers[event] = callback;
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}
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void
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GlobalEvents::Emit(Event event)
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{
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assert((unsigned)event < MAX);
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const unsigned mask = 1u << unsigned(event);
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if (GlobalEvents::flags.fetch_or(mask) == 0)
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monitor->Schedule();
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}
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