| J. Duke | 319a3b9 | 2007-12-01 00:00:00 +0000 | [diff] [blame^] | 1 | /* |
| 2 | * Copyright 2002 Sun Microsystems, Inc. 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. Sun designates this |
| 8 | * particular file as subject to the "Classpath" exception as provided |
| 9 | * by Sun 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 Sun Microsystems, Inc., 4150 Network Circle, Santa Clara, |
| 22 | * CA 95054 USA or visit www.sun.com if you need additional information or |
| 23 | * have any questions. |
| 24 | */ |
| 25 | |
| 26 | package 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 zero and the signal(long) method has no effect. |
| 38 | |
| 39 | |
| 40 | 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 zero. |
| 45 | // |
| 46 | 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 | static native void signal(long nt); |
| 53 | |
| 54 | static native void init(); |
| 55 | |
| 56 | static { |
| 57 | Util.load(); |
| 58 | init(); |
| 59 | } |
| 60 | |
| 61 | } |