Mercurial > hg > truffle
view test/compiler/6857159/Test6857159.java @ 2134:b158bed62ef5
6994297: G1: do first-level slow-path allocations with a CAS
Summary: First attempt to allocate out the current alloc region using a CAS instead of taking the Heap_lock (first level of G1's slow allocation path). Only if that fails and it's necessary to replace the current alloc region take the Heap_lock (that's the second level of G1's slow allocation path).
Reviewed-by: johnc, brutisso, ysr
author | tonyp |
---|---|
date | Wed, 12 Jan 2011 16:34:25 -0500 |
parents | 086898a88056 |
children | 0a8e0d4345b3 |
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/* * Copyright (c) 2009, Oracle and/or its affiliates. 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 Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA * or visit www.oracle.com if you need additional information or have any * questions. * */ /** * @test * @bug 6857159 * @summary local schedule failed with checkcast of Thread.currentThread() * * @run shell Test6857159.sh */ public class Test6857159 extends Thread { static class ct0 extends Test6857159 { public void message() { // System.out.println("message"); } public void run() { message(); ct0 ct = (ct0) Thread.currentThread(); ct.message(); } } static class ct1 extends ct0 { public void message() { // System.out.println("message"); } } static class ct2 extends ct0 { public void message() { // System.out.println("message"); } } public static void main(String[] args) throws Exception { for (int i = 0; i < 20000; i++) { Thread t = null; switch (i % 3) { case 0: t = new ct0(); break; case 1: t = new ct1(); break; case 2: t = new ct2(); break; } t.start(); t.join(); } } }