event/DeferredMonitor: new class wrapping g_idle_add()

1 files changed, 55 insertions, 0 deletions

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;
+}