Mercurial > hg > truffle
annotate agent/src/share/classes/sun/jvm/hotspot/utilities/MessageQueueBackend.java @ 1913:3b2dea75431e
6984311: JSR 292 needs optional bootstrap method parameters
Summary: Allow CONSTANT_InvokeDynamic nodes to have any number of extra operands.
Reviewed-by: twisti
| author | jrose |
|---|---|
| date | Sat, 30 Oct 2010 13:08:23 -0700 |
| parents | c18cbe5936b8 |
| children |
| rev | line source |
|---|---|
| 0 | 1 /* |
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6941466: Oracle rebranding changes for Hotspot repositories
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2 * Copyright (c) 2000, Oracle and/or its affiliates. All rights reserved. |
| 0 | 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. | |
| 8 * | |
| 9 * This code is distributed in the hope that it will be useful, but WITHOUT | |
| 10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or | |
| 11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License | |
| 12 * version 2 for more details (a copy is included in the LICENSE file that | |
| 13 * accompanied this code). | |
| 14 * | |
| 15 * You should have received a copy of the GNU General Public License version | |
| 16 * 2 along with this work; if not, write to the Free Software Foundation, | |
| 17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. | |
| 18 * | |
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6941466: Oracle rebranding changes for Hotspot repositories
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19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA |
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c18cbe5936b8
6941466: Oracle rebranding changes for Hotspot repositories
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20 * or visit www.oracle.com if you need additional information or have any |
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c18cbe5936b8
6941466: Oracle rebranding changes for Hotspot repositories
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21 * questions. |
| 0 | 22 * |
| 23 */ | |
| 24 | |
| 25 package sun.jvm.hotspot.utilities; | |
| 26 | |
| 27 /** The backend for the message queue abstraction. This class is | |
| 28 instantiated first and queried to provide the two "sides" of the | |
| 29 message queue. */ | |
| 30 | |
| 31 import java.util.LinkedList; | |
| 32 | |
| 33 public class MessageQueueBackend { | |
| 34 // The two queues | |
| 35 private MessageQueueImpl leftRightQueue; | |
| 36 private MessageQueueImpl rightLeftQueue; | |
| 37 | |
| 38 public MessageQueueBackend() { | |
| 39 LinkedList leftRightPipe = new LinkedList(); | |
| 40 LinkedList rightLeftPipe = new LinkedList(); | |
| 41 leftRightQueue = new MessageQueueImpl(rightLeftPipe, leftRightPipe); | |
| 42 rightLeftQueue = new MessageQueueImpl(leftRightPipe, rightLeftPipe); | |
| 43 } | |
| 44 | |
| 45 /** Get one of the two symmetric sides of this message queue. */ | |
| 46 public MessageQueue getFirstQueue() { | |
| 47 return leftRightQueue; | |
| 48 } | |
| 49 | |
| 50 /** Get second of the two symmetric sides of this message queue. */ | |
| 51 public MessageQueue getSecondQueue() { | |
| 52 return rightLeftQueue; | |
| 53 } | |
| 54 | |
| 55 private class MessageQueueImpl implements MessageQueue { | |
| 56 private LinkedList readList; | |
| 57 private LinkedList writeList; | |
| 58 | |
| 59 public MessageQueueImpl(LinkedList listToReadFrom, LinkedList listToWriteTo) { | |
| 60 readList = listToReadFrom; | |
| 61 writeList = listToWriteTo; | |
| 62 } | |
| 63 | |
| 64 public Object readMessage() { | |
| 65 synchronized(readList) { | |
| 66 while (readList.isEmpty()) { | |
| 67 try { | |
| 68 readList.wait(); | |
| 69 } | |
| 70 catch (InterruptedException e) { | |
| 71 } | |
| 72 } | |
| 73 return readList.removeFirst(); | |
| 74 } | |
| 75 } | |
| 76 | |
| 77 public Object readMessageWithTimeout(long millis) { | |
| 78 synchronized(readList) { | |
| 79 if (readList.isEmpty()) { | |
| 80 if (millis == 0) { | |
| 81 return null; | |
| 82 } | |
| 83 try { | |
| 84 readList.wait(millis); | |
| 85 } | |
| 86 catch (InterruptedException e) { | |
| 87 } | |
| 88 } | |
| 89 // If list is still empty after wait, return null | |
| 90 if (readList.isEmpty()) { | |
| 91 return null; | |
| 92 } | |
| 93 return readList.removeFirst(); | |
| 94 } | |
| 95 } | |
| 96 | |
| 97 public void writeMessage(Object obj) { | |
| 98 synchronized(writeList) { | |
| 99 writeList.addLast(obj); | |
| 100 writeList.notify(); | |
| 101 } | |
| 102 } | |
| 103 } | |
| 104 } |