Mercurial > hg > truffle
view agent/src/share/classes/sun/jvm/hotspot/utilities/MessageQueue.java @ 669:eca19a8425b5
6810653: Change String cache class used by Hotspot from String to StringValue
Summary: Change create_vm() to load and initialize StringValue rather than String.
Reviewed-by: kvn
author | phh |
---|---|
date | Tue, 24 Mar 2009 21:56:53 -0400 |
parents | a61af66fc99e |
children | c18cbe5936b8 |
line wrap: on
line source
/* * Copyright 2000 Sun Microsystems, Inc. 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. * * 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 Sun Microsystems, Inc., 4150 Network Circle, Santa Clara, * CA 95054 USA or visit www.sun.com if you need additional information or * have any questions. * */ package sun.jvm.hotspot.utilities; /** <p> A two-way unbounded-length message queue useful for communication between threads. Messages written on one side become readable on the other in first-in, first-out order. This is an interface to one of two "sides" of an underlying backend, for example, the MessageQueueBackend. </p> */ public interface MessageQueue { /** This blocks until a message is available. Even if the thread is interrupted while it is waiting, this will not return until a message is written by the entity on the other side of the queue. */ public Object readMessage(); /** This blocks for up to <code>millis</code> milliseconds until a message is available. If no message becomes available within this time period, or the thread is interrupted during the wait, returns null. (This implies that passing the value null back and forth is not distinguishable with this method.) Passing a value of 0 for the <code>millis</code> argument causes this method to return without blocking. The millis argument must be greater than or equal to zero. */ public Object readMessageWithTimeout(long millis); /** Write a message to the queue */ public void writeMessage(Object obj); }