--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/src/java.base/unix/classes/sun/nio/ch/NativeThread.java	Tue Sep 12 19:03:39 2017 +0200
@@ -0,0 +1,61 @@
+/*
+ * Copyright (c) 2002, 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;
+
+
+// Signalling operations on native threads
+//
+// On some operating systems (e.g., Linux), closing a channel while another
+// thread is blocked in an I/O operation upon that channel does not cause that
+// thread to be released.  This class provides access to the native threads
+// upon which Java threads are built, and defines a simple signal mechanism
+// that can be used to release a native thread from a blocking I/O operation.
+// On systems that do not require this type of signalling, the current() method
+// always returns -1 and the signal(long) method has no effect.
+
+
+public class NativeThread {
+
+    // Returns an opaque token representing the native thread underlying the
+    // invoking Java thread.  On systems that do not require signalling, this
+    // method always returns -1.
+    //
+    public static native long current();
+
+    // Signals the given native thread so as to release it from a blocking I/O
+    // operation.  On systems that do not require signalling, this method has
+    // no effect.
+    //
+    public static native void signal(long nt);
+
+    private static native void init();
+
+    static {
+        IOUtil.load();
+        init();
+    }
+
+}