--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/src/java.base/windows/classes/sun/nio/ch/PollArrayWrapper.java	Tue Sep 12 19:03:39 2017 +0200
@@ -0,0 +1,115 @@
+/*
+ * Copyright (c) 2001, 2013, Oracle and/or its affiliates. All rights reserved.
+ * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
+ *
+ * This code is free software; you can redistribute it and/or modify it
+ * under the terms of the GNU General Public License version 2 only, as
+ * published by the Free Software Foundation.  Oracle designates this
+ * particular file as subject to the "Classpath" exception as provided
+ * by Oracle in the LICENSE file that accompanied this code.
+ *
+ * This code 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
+ * version 2 for more details (a copy is included in the LICENSE file that
+ * accompanied this code).
+ *
+ * You should have received a copy of the GNU General Public License version
+ * 2 along with this work; if not, write to the Free Software Foundation,
+ * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
+ *
+ * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
+ * or visit www.oracle.com if you need additional information or have any
+ * questions.
+ */
+
+/*
+ */
+
+package sun.nio.ch;
+
+import java.lang.annotation.Native;
+
+/**
+ * Manipulates a native array of structs corresponding to (fd, events) pairs.
+ *
+ * typedef struct pollfd {
+ *    SOCKET fd;            // 4 bytes
+ *    short events;         // 2 bytes
+ * } pollfd_t;
+ *
+ * @author Konstantin Kladko
+ * @author Mike McCloskey
+ */
+
+class PollArrayWrapper {
+
+    private AllocatedNativeObject pollArray; // The fd array
+
+    long pollArrayAddress; // pollArrayAddress
+
+    @Native private static final short FD_OFFSET     = 0; // fd offset in pollfd
+    @Native private static final short EVENT_OFFSET  = 4; // events offset in pollfd
+
+    static short SIZE_POLLFD = 8; // sizeof pollfd struct
+
+    private int size; // Size of the pollArray
+
+    PollArrayWrapper(int newSize) {
+        int allocationSize = newSize * SIZE_POLLFD;
+        pollArray = new AllocatedNativeObject(allocationSize, true);
+        pollArrayAddress = pollArray.address();
+        this.size = newSize;
+    }
+
+    // Prepare another pollfd struct for use.
+    void addEntry(int index, SelectionKeyImpl ski) {
+        putDescriptor(index, ski.channel.getFDVal());
+    }
+
+    // Writes the pollfd entry from the source wrapper at the source index
+    // over the entry in the target wrapper at the target index.
+    void replaceEntry(PollArrayWrapper source, int sindex,
+                                     PollArrayWrapper target, int tindex) {
+        target.putDescriptor(tindex, source.getDescriptor(sindex));
+        target.putEventOps(tindex, source.getEventOps(sindex));
+    }
+
+    // Grows the pollfd array to new size
+    void grow(int newSize) {
+        PollArrayWrapper temp = new PollArrayWrapper(newSize);
+        for (int i = 0; i < size; i++)
+            replaceEntry(this, i, temp, i);
+        pollArray.free();
+        pollArray = temp.pollArray;
+        this.size = temp.size;
+        pollArrayAddress = pollArray.address();
+    }
+
+    void free() {
+        pollArray.free();
+    }
+
+    // Access methods for fd structures
+    void putDescriptor(int i, int fd) {
+        pollArray.putInt(SIZE_POLLFD * i + FD_OFFSET, fd);
+    }
+
+    void putEventOps(int i, int event) {
+        pollArray.putShort(SIZE_POLLFD * i + EVENT_OFFSET, (short)event);
+    }
+
+    int getEventOps(int i) {
+        return pollArray.getShort(SIZE_POLLFD * i + EVENT_OFFSET);
+    }
+
+    int getDescriptor(int i) {
+       return pollArray.getInt(SIZE_POLLFD * i + FD_OFFSET);
+    }
+
+    // Adds Windows wakeup socket at a given index.
+    void addWakeupSocket(int fdVal, int index) {
+        putDescriptor(index, fdVal);
+        putEventOps(index, Net.POLLIN);
+    }
+}