1 files changed, 125 insertions, 0 deletions
diff --git a/src/event/MultiSocketMonitor.hxx b/src/event/MultiSocketMonitor.hxx
new file mode 100644
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--- /dev/null
+++ b/src/event/MultiSocketMonitor.hxx
@@ -0,0 +1,125 @@
+/*
+ * 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_MULTI_SOCKET_MONITOR_HXX
+#define MPD_MULTI_SOCKET_MONITOR_HXX
+
+#include "check.h"
+#include "gcc.h"
+#include "glib_compat.h"
+
+#include <glib.h>
+
+#include <forward_list>
+
+#include <assert.h>
+
+#ifdef WIN32
+/* ERRORis a WIN32 macro that poisons our namespace; this is a
+   kludge to allow us to use it anyway */
+#ifdef ERROR
+#undef ERROR
+#endif
+#endif
+
+class EventLoop;
+
+/**
+ * Monitor multiple sockets.
+ */
+class MultiSocketMonitor {
+	struct Source {
+		GSource base;
+
+		MultiSocketMonitor *monitor;
+	};
+
+	EventLoop &loop;
+	Source *source;
+	std::forward_list<GPollFD> fds;
+
+public:
+	static constexpr unsigned READ = G_IO_IN;
+	static constexpr unsigned WRITE = G_IO_OUT;
+	static constexpr unsigned ERROR = G_IO_ERR;
+	static constexpr unsigned HANGUP = G_IO_HUP;
+
+	MultiSocketMonitor(EventLoop &_loop);
+	~MultiSocketMonitor();
+
+public:
+	gcc_pure
+	gint64 GetTime() const {
+		return g_source_get_time(&source->base);
+	}
+
+	void InvalidateSockets() {
+		/* no-op because GLib always calls the GSource's
+		   "prepare" method before each poll() anyway */
+	}
+
+	void AddSocket(int fd, unsigned events) {
+		fds.push_front({fd, gushort(events), 0});
+		g_source_add_poll(&source->base, &fds.front());
+	}
+
+	template<typename E>
+	void UpdateSocketList(E &&e) {
+		for (auto prev = fds.before_begin(), end = fds.end(),
+			     i = std::next(prev);
+		     i != end; i = std::next(prev)) {
+			assert(i->events != 0);
+
+			unsigned events = e(i->fd);
+			if (events != 0) {
+				i->events = events;
+				prev = i;
+			} else {
+				g_source_remove_poll(&source->base, &*i);
+				fds.erase_after(prev);
+			}
+		}
+	}
+
+protected:
+	virtual void PrepareSockets(gcc_unused gint *timeout_r) {}
+	virtual bool CheckSockets() const { return false; }
+	virtual void DispatchSockets() = 0;
+
+public:
+	/* GSource callbacks */
+	static gboolean Prepare(GSource *source, gint *timeout_r);
+	static gboolean Check(GSource *source);
+	static gboolean Dispatch(GSource *source, GSourceFunc callback,
+				 gpointer user_data);
+
+private:
+	bool Prepare(gint *timeout_r) {
+		PrepareSockets(timeout_r);
+		return false;
+	}
+
+	bool Check() const;
+
+	void Dispatch() {
+		DispatchSockets();
+	}
+};
+
+#endif