1 files changed, 98 insertions, 0 deletions
diff --git a/src/event/DeferredMonitor.hxx b/src/event/DeferredMonitor.hxx
new file mode 100644
index 000000000..988dce2d8
--- /dev/null
+++ b/src/event/DeferredMonitor.hxx
@@ -0,0 +1,98 @@
+/*
+ * 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_SOCKET_DEFERRED_MONITOR_HXX
+#define MPD_SOCKET_DEFERRED_MONITOR_HXX
+
+#include "check.h"
+#include "gcc.h"
+
+#ifdef USE_EPOLL
+#include "SocketMonitor.hxx"
+#include "WakeFD.hxx"
+#else
+#include <glib.h>
+#endif
+
+#include <atomic>
+
+class EventLoop;
+
+/**
+ * Defer execution of an event into an #EventLoop.
+ */
+class DeferredMonitor
+#ifdef USE_EPOLL
+	: private SocketMonitor
+#endif
+{
+#ifdef USE_EPOLL
+	std::atomic_bool pending;
+	WakeFD fd;
+#else
+	EventLoop &loop;
+
+	std::atomic<guint> source_id;
+#endif
+
+public:
+#ifdef USE_EPOLL
+	DeferredMonitor(EventLoop &_loop)
+		:SocketMonitor(_loop), pending(false) {
+		SocketMonitor::Open(fd.Get());
+		SocketMonitor::Schedule(SocketMonitor::READ);
+	}
+#else
+	DeferredMonitor(EventLoop &_loop)
+		:loop(_loop), source_id(0) {}
+#endif
+
+	~DeferredMonitor() {
+#ifdef USE_EPOLL
+		/* avoid closing the WakeFD twice */
+		SocketMonitor::Steal();
+#else
+		Cancel();
+#endif
+	}
+
+	EventLoop &GetEventLoop() {
+#ifdef USE_EPOLL
+		return SocketMonitor::GetEventLoop();
+#else
+		return loop;
+#endif
+	}
+
+	void Schedule();
+	void Cancel();
+
+protected:
+	virtual void RunDeferred() = 0;
+
+private:
+#ifdef USE_EPOLL
+	virtual bool OnSocketReady(unsigned flags) override final;
+#else
+	void Run();
+	static gboolean Callback(gpointer data);
+#endif
+};
+
+#endif /* MAIN_NOTIFY_H */