migrate to async IO model

new PIIODevice::interrupt() virtual method
new PIWaitEvent private class
PIEthernet and PISerial basically tested on Windows and Linux

libs/main/core/piwaitevent_p.h

@@ -0,0 +1,67 @@
+/*
+	PIP - Platform Independent Primitives
+	Private PIP wait object
+	Ivan Pelipenko peri4ko@yandex.ru
+
+	This program is free software: you can redistribute it and/or modify
+	it under the terms of the GNU Lesser General Public License as published by
+	the Free Software Foundation, either version 3 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 Lesser General Public License for more details.
+
+	You should have received a copy of the GNU Lesser General Public License
+	along with this program.  If not, see <http://www.gnu.org/licenses/>.
+*/
+
+#ifndef PIWAITEVENT_P_H
+#define PIWAITEVENT_P_H
+
+#include "pibase.h"
+#ifdef WINDOWS
+#  include <stdarg.h>
+#  include <windef.h>
+#  include <winbase.h>
+#else
+#  include <unistd.h>
+#  include <sys/select.h>
+#endif
+
+
+class PIWaitEvent {
+public:
+	~PIWaitEvent();
+
+	void create();
+	void destroy();
+#ifdef WINDOWS
+	bool wait();
+#else
+	enum SelectRole {
+		CheckRead,
+		CheckWrite
+	};
+	bool wait(int fd, SelectRole role = CheckRead);
+#endif
+	void interrupt();
+	bool isCreate() const;
+
+#ifdef WINDOWS
+	HANDLE event = NULL;
+#else
+private:
+	int pipe_fd[2] = {0, 0};
+	fd_set fds[3];
+	enum {
+		ReadEnd  = 0,
+		WriteEnd = 1
+	};
+#endif
+
+};
+
+
+#endif // PIWAITEVENT_P_H