event: add poll() based PollGroup implementation

1 files changed, 62 insertions, 0 deletions

diff --git a/src/event/PollGroupPoll.hxx b/src/event/PollGroupPoll.hxx
new file mode 100644
index 000000000..e8850ebb5
--- /dev/null
+++ b/src/event/PollGroupPoll.hxx
@@ -0,0 +1,62 @@
+/*
+ * 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_POLLGROUP_POLL_HXX
+#define MPD_EVENT_POLLGROUP_POLL_HXX
+
+#include "check.h"
+#include "PollResultGeneric.hxx"
+
+#include <string.h> // for size_t
+#include <vector>
+#include <unordered_map>
+#include <sys/poll.h>
+
+class PollGroupPoll
+{
+	struct Item
+	{
+		size_t index;
+		void *obj;
+	};
+
+	std::vector<pollfd> poll_events;
+	std::unordered_map<int, Item> items;
+
+	PollGroupPoll(PollGroupPoll &) = delete;
+	PollGroupPoll &operator=(PollGroupPoll &) = delete;
+public:
+	static constexpr unsigned READ = POLLIN;
+	static constexpr unsigned WRITE = POLLOUT;
+	static constexpr unsigned ERROR = POLLERR;
+	static constexpr unsigned HANGUP = POLLHUP;
+
+	PollGroupPoll();
+	~PollGroupPoll();
+
+	void ReadEvents(PollResultGeneric &result, int timeout_ms);
+	bool Add(int fd, unsigned events, void *obj);
+	bool Modify(int fd, unsigned events, void *obj);
+	bool Remove(int fd);
+	bool Abandon(int fd) {
+		return Remove(fd);
+	}
+};
+
+#endif