event: implement PollGroup based on Windows select

1 files changed, 109 insertions, 0 deletions

diff --git a/src/event/PollGroupWinSelect.hxx b/src/event/PollGroupWinSelect.hxx
new file mode 100644
index 000000000..722d06f52
--- /dev/null
+++ b/src/event/PollGroupWinSelect.hxx
@@ -0,0 +1,109 @@
+/*
+ * 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_WINSELECT_HXX
+#define MPD_EVENT_POLLGROUP_WINSELECT_HXX
+
+#include "check.h"
+
+#include "PollResultGeneric.hxx"
+
+#include <assert.h>
+#include <string.h>
+
+#include <unordered_map>
+
+#include <windows.h>
+#include <winsock2.h>
+
+#ifdef ERROR
+#undef ERROR
+#endif
+
+class SocketSet
+{
+	fd_set set;
+public:
+	SocketSet() { set.fd_count = 0; }
+	SocketSet(SocketSet &other) {
+		set.fd_count = other.set.fd_count;
+		memcpy(set.fd_array,
+		       other.set.fd_array,
+		       sizeof (SOCKET) * set.fd_count);
+	}
+
+	fd_set *GetPtr() { return &set; }
+	int Size() { return set.fd_count; }
+	bool IsEmpty() { return set.fd_count == 0; }
+	bool IsFull() { return set.fd_count == FD_SETSIZE; }
+
+	int operator[](int index) {
+		assert(index >= 0 && (u_int)index < set.fd_count);
+		return set.fd_array[index];
+	}
+
+	int Add(int fd) {
+		assert(!IsFull());
+		set.fd_array[set.fd_count] = fd;
+		return set.fd_count++;
+	}
+
+	void MoveToEnd(int index) {
+		assert(index >= 0 && (u_int)index < set.fd_count);
+		std::swap(set.fd_array[index], set.fd_array[set.fd_count - 1]);
+	}
+
+	void RemoveLast() {
+		assert(!IsEmpty());
+		--set.fd_count;
+	}
+};
+
+class PollGroupWinSelect
+{
+	struct Item
+	{
+		int index[2];
+		void *obj;
+		unsigned events;
+	};
+
+	SocketSet event_set[2];
+	std::unordered_map<int, Item> items;
+
+	bool CanModify(Item &item, unsigned events, int event_id);
+	void Modify(Item &item, int fd, unsigned events, int event_id);
+
+public:
+	static constexpr unsigned READ = 1;
+	static constexpr unsigned WRITE = 2;
+	static constexpr unsigned ERROR = 0;
+	static constexpr unsigned HANGUP = 0;
+
+	PollGroupWinSelect() { }
+	~PollGroupWinSelect() { }
+
+	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