Initial iocp implementation.

Author: ioquatix

ext/extconf.rb

@@ -39,6 +39,10 @@
 	$srcs << "io/event/selector/kqueue.c"
 end
 
+if have_header('windows.h')
+	$srcs << "io/event/selector/iocp.c"
+end
+
 have_header('sys/wait.h')
 
 have_header('sys/eventfd.h')