Mercurial > hg > graal-compiler
annotate agent/src/share/classes/sun/jvm/hotspot/utilities/MessageQueue.java @ 6725:da91efe96a93
6964458: Reimplement class meta-data storage to use native memory
Summary: Remove PermGen, allocate meta-data in metaspace linked to class loaders, rewrite GC walking, rewrite and rename metadata to be C++ classes
Reviewed-by: jmasa, stefank, never, coleenp, kvn, brutisso, mgerdin, dholmes, jrose, twisti, roland
Contributed-by: jmasa <jon.masamitsu@oracle.com>, stefank <stefan.karlsson@oracle.com>, mgerdin <mikael.gerdin@oracle.com>, never <tom.rodriguez@oracle.com>
| author | coleenp |
|---|---|
| date | Sat, 01 Sep 2012 13:25:18 -0400 |
| parents | c18cbe5936b8 |
| children |
| rev | line source |
|---|---|
| 0 | 1 /* |
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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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19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA |
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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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21 * questions. |
| 0 | 22 * |
| 23 */ | |
| 24 | |
| 25 package sun.jvm.hotspot.utilities; | |
| 26 | |
| 27 /** <p> A two-way unbounded-length message queue useful for | |
| 28 communication between threads. Messages written on one side become | |
| 29 readable on the other in first-in, first-out order. This is an | |
| 30 interface to one of two "sides" of an underlying backend, for | |
| 31 example, the MessageQueueBackend. </p> */ | |
| 32 | |
| 33 public interface MessageQueue { | |
| 34 /** This blocks until a message is available. Even if the thread is | |
| 35 interrupted while it is waiting, this will not return until a | |
| 36 message is written by the entity on the other side of the | |
| 37 queue. */ | |
| 38 public Object readMessage(); | |
| 39 | |
| 40 /** This blocks for up to <code>millis</code> milliseconds until a | |
| 41 message is available. If no message becomes available within | |
| 42 this time period, or the thread is interrupted during the wait, | |
| 43 returns null. (This implies that passing the value null back and | |
| 44 forth is not distinguishable with this method.) Passing a value | |
| 45 of 0 for the <code>millis</code> argument causes this method to | |
| 46 return without blocking. The millis argument must be greater | |
| 47 than or equal to zero. */ | |
| 48 public Object readMessageWithTimeout(long millis); | |
| 49 | |
| 50 /** Write a message to the queue */ | |
| 51 public void writeMessage(Object obj); | |
| 52 } |