1 files changed, 191 insertions, 0 deletions
diff --git a/src/event/Loop.hxx b/src/event/Loop.hxx
new file mode 100644
index 000000000..ec90cdacf
--- /dev/null
+++ b/src/event/Loop.hxx
@@ -0,0 +1,191 @@
+/*
+ * Copyright (C) 2003-2013 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_LOOP_HXX
+#define MPD_EVENT_LOOP_HXX
+
+#include "check.h"
+#include "thread/Id.hxx"
+#include "gcc.h"
+
+#ifdef USE_EPOLL
+#include "system/EPollFD.hxx"
+#include "thread/Mutex.hxx"
+#include "WakeFD.hxx"
+#include "SocketMonitor.hxx"
+
+#include <functional>
+#include <list>
+#include <set>
+#else
+#include <glib.h>
+#endif
+
+#ifdef USE_EPOLL
+class TimeoutMonitor;
+class IdleMonitor;
+class SocketMonitor;
+#endif
+
+#include <assert.h>
+
+class EventLoop final
+#ifdef USE_EPOLL
+	: private SocketMonitor
+#endif
+{
+#ifdef USE_EPOLL
+	struct TimerRecord {
+		/**
+		 * Projected monotonic_clock_ms() value when this
+		 * timer is due.
+		 */
+		const unsigned due_ms;
+
+		TimeoutMonitor &timer;
+
+		constexpr TimerRecord(TimeoutMonitor &_timer,
+				      unsigned _due_ms)
+			:due_ms(_due_ms), timer(_timer) {}
+
+		bool operator<(const TimerRecord &other) const {
+			return due_ms < other.due_ms;
+		}
+
+		bool IsDue(unsigned _now_ms) const {
+			return _now_ms >= due_ms;
+		}
+	};
+
+	EPollFD epoll;
+
+	WakeFD wake_fd;
+
+	std::multiset<TimerRecord> timers;
+	std::list<IdleMonitor *> idle;
+
+	Mutex mutex;
+	std::list<std::function<void()>> calls;
+
+	unsigned now_ms;
+
+	bool quit;
+
+	static constexpr unsigned MAX_EVENTS = 16;
+	unsigned n_events;
+	epoll_event events[MAX_EVENTS];
+#else
+	GMainContext *context;
+	GMainLoop *loop;
+#endif
+
+	/**
+	 * A reference to the thread that is currently inside Run().
+	 */
+	ThreadId thread;
+
+public:
+#ifdef USE_EPOLL
+	struct Default {};
+
+	EventLoop(Default dummy=Default());
+	~EventLoop();
+
+	unsigned GetTimeMS() const {
+		return now_ms;
+	}
+
+	void Break();
+
+	bool AddFD(int _fd, unsigned flags, SocketMonitor &m) {
+		return epoll.Add(_fd, flags, &m);
+	}
+
+	bool ModifyFD(int _fd, unsigned flags, SocketMonitor &m) {
+		return epoll.Modify(_fd, flags, &m);
+	}
+
+	bool RemoveFD(int fd, SocketMonitor &m);
+
+	void AddIdle(IdleMonitor &i);
+	void RemoveIdle(IdleMonitor &i);
+
+	void AddTimer(TimeoutMonitor &t, unsigned ms);
+	void CancelTimer(TimeoutMonitor &t);
+
+	void AddCall(std::function<void()> &&f);
+
+	void Run();
+
+private:
+	virtual bool OnSocketReady(unsigned flags) override;
+
+public:
+#else
+	EventLoop()
+		:context(g_main_context_new()),
+		 loop(g_main_loop_new(context, false)),
+		 thread(ThreadId::Null()) {}
+
+	struct Default {};
+	EventLoop(gcc_unused Default _dummy)
+		:context(g_main_context_ref(g_main_context_default())),
+		 loop(g_main_loop_new(context, false)),
+		 thread(ThreadId::Null()) {}
+
+	~EventLoop() {
+		g_main_loop_unref(loop);
+		g_main_context_unref(context);
+	}
+
+	GMainContext *GetContext() {
+		return context;
+	}
+
+	void WakeUp() {
+		g_main_context_wakeup(context);
+	}
+
+	void Break() {
+		g_main_loop_quit(loop);
+	}
+
+	void Run();
+
+	guint AddIdle(GSourceFunc function, gpointer data);
+
+	GSource *AddTimeout(guint interval_ms,
+			    GSourceFunc function, gpointer data);
+
+	GSource *AddTimeoutSeconds(guint interval_s,
+				   GSourceFunc function, gpointer data);
+#endif
+
+	/**
+	 * Are we currently running inside this EventLoop's thread?
+	 */
+	gcc_pure
+	bool IsInside() const {
+		assert(!thread.IsNull());
+
+		return thread.IsInside();
+	}
+};
+
+#endif /* MAIN_NOTIFY_H */