From 355dd5cb24f1d36cb13a2463ce7585186474adc8 Mon Sep 17 00:00:00 2001
From: Max Kellermann <max@duempel.org>
Date: Wed, 7 Aug 2013 18:59:42 +0200
Subject: event/DeferredMonitor: new class wrapping g_idle_add()

---
 src/event/DeferredMonitor.cxx | 55 +++++++++++++++++++++++++++++++++++++++++++
 src/event/DeferredMonitor.hxx | 54 ++++++++++++++++++++++++++++++++++++++++++
 2 files changed, 109 insertions(+)
 create mode 100644 src/event/DeferredMonitor.cxx
 create mode 100644 src/event/DeferredMonitor.hxx

(limited to 'src/event')

diff --git a/src/event/DeferredMonitor.cxx b/src/event/DeferredMonitor.cxx
new file mode 100644
index 000000000..10aa0d757
--- /dev/null
+++ b/src/event/DeferredMonitor.cxx
@@ -0,0 +1,55 @@
+/*
+ * 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.
+ */
+
+#include "config.h"
+#include "DeferredMonitor.hxx"
+#include "Loop.hxx"
+
+void
+DeferredMonitor::Cancel()
+{
+	const auto id = source_id.exchange(0);
+	if (id != 0)
+		g_source_remove(id);
+}
+
+void
+DeferredMonitor::Schedule()
+{
+	const unsigned id = g_idle_add(Callback, this);
+	const auto old_id = source_id.exchange(id);
+	if (old_id != 0)
+		g_source_remove(old_id);
+}
+
+void
+DeferredMonitor::DoRun()
+{
+	const auto id = source_id.exchange(0);
+	if (id != 0)
+		Run();
+}
+
+gboolean
+DeferredMonitor::Callback(gpointer data)
+{
+	DeferredMonitor &monitor = *(DeferredMonitor *)data;
+	monitor.Run();
+	return false;
+}
diff --git a/src/event/DeferredMonitor.hxx b/src/event/DeferredMonitor.hxx
new file mode 100644
index 000000000..8a08facba
--- /dev/null
+++ b/src/event/DeferredMonitor.hxx
@@ -0,0 +1,54 @@
+/*
+ * 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 <glib.h>
+
+#include <atomic>
+
+/**
+ * Defer execution of an event into an #EventLoop.
+ */
+class DeferredMonitor {
+	std::atomic<guint> source_id;
+
+public:
+	DeferredMonitor()
+		:source_id(0) {}
+
+	~DeferredMonitor() {
+		Cancel();
+	}
+
+	void Schedule();
+	void Cancel();
+
+protected:
+	virtual void Run() = 0;
+
+private:
+	void DoRun();
+	static gboolean Callback(gpointer data);
+};
+
+#endif /* MAIN_NOTIFY_H */
-- 
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