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