1/*
2 * Copyright (c) 2002, 2013, Oracle and/or its affiliates. All rights reserved.
3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
4 *
5 * This code is free software; you can redistribute it and/or modify it
6 * under the terms of the GNU General Public License version 2 only, as
7 * published by the Free Software Foundation.  Oracle designates this
8 * particular file as subject to the "Classpath" exception as provided
9 * by Oracle in the LICENSE file that accompanied this code.
10 *
11 * This code is distributed in the hope that it will be useful, but WITHOUT
12 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
13 * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
14 * version 2 for more details (a copy is included in the LICENSE file that
15 * accompanied this code).
16 *
17 * You should have received a copy of the GNU General Public License version
18 * 2 along with this work; if not, write to the Free Software Foundation,
19 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
20 *
21 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
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24 */
25
26package sun.nio.ch;
27
28
29// Signalling operations on native threads
30//
31// On some operating systems (e.g., Linux), closing a channel while another
32// thread is blocked in an I/O operation upon that channel does not cause that
33// thread to be released.  This class provides access to the native threads
34// upon which Java threads are built, and defines a simple signal mechanism
35// that can be used to release a native thread from a blocking I/O operation.
36// On systems that do not require this type of signalling, the current() method
37// always returns -1 and the signal(long) method has no effect.
38
39
40public class NativeThread {
41
42    // Returns an opaque token representing the native thread underlying the
43    // invoking Java thread.  On systems that do not require signalling, this
44    // method always returns -1.
45    //
46    public static native long current();
47
48    // Signals the given native thread so as to release it from a blocking I/O
49    // operation.  On systems that do not require signalling, this method has
50    // no effect.
51    //
52    public static native void signal(long nt);
53}
54