Mercurial > hg > graal-compiler
view test/compiler/testlibrary/rtm/MemoryConflictProvoker.java @ 20276:1526a938e670
8047818: G1 HeapRegions can no longer be ContiguousSpaces
Summary: Change parent of G1OffsetTableContigSpace to CompactibleSpace, reimplement missing functionality
Reviewed-by: stefank, jmasa, tschatzl
author | mgerdin |
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date | Thu, 26 Jun 2014 11:36:58 +0200 |
parents | 665bbe93823f |
children |
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/* * Copyright (c) 2014, 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. * */ package rtm; import java.util.concurrent.BrokenBarrierException; import java.util.concurrent.CyclicBarrier; /** * To force transactional execution abort due to memory conflict * one thread should access memory region from transactional region * while another thread should modify the same memory region. * Since this scenario is based on the race condition between threads * you should not expect some particular amount of aborts. */ class MemoryConflictProvoker extends AbortProvoker { // Following field have to be static in order to avoid escape analysis. @SuppressWarnings("UnsuedDeclaration") private static int field = 0; private static final int INNER_ITERATIONS = 10000; private final CyclicBarrier barrier; /** * This thread will access and modify memory region * from outside of the transaction. */ private final Runnable conflictingThread; public MemoryConflictProvoker() { this(new Object()); } public MemoryConflictProvoker(Object monitor) { super(monitor); barrier = new CyclicBarrier(2); conflictingThread = () -> { try { barrier.await(); } catch (Exception e) { throw new RuntimeException(e); } for (int i = 0; i < MemoryConflictProvoker.INNER_ITERATIONS; i++) { MemoryConflictProvoker.field++; } }; } /** * Accesses and modifies memory region from within the transaction. */ public void transactionalRegion() { try { barrier.await(); } catch (InterruptedException | BrokenBarrierException e) { throw new RuntimeException(e); } for (int i = 0; i < MemoryConflictProvoker.INNER_ITERATIONS; i++) { synchronized(monitor) { MemoryConflictProvoker.field--; } } } @Override public void forceAbort() { try { Thread t = new Thread(conflictingThread); t.start(); transactionalRegion(); t.join(); } catch (Exception e) { throw new RuntimeException(e); } } @Override public String getMethodWithLockName() { return this.getClass().getName() + "::transactionalRegion"; } }