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Co-authored-by: Ron Pressler <rpressler@openjdk.org> Co-authored-by: Alan Bateman <alanb@openjdk.org> Co-authored-by: Erik Österlund <eosterlund@openjdk.org> Co-authored-by: Andrew Haley <aph@openjdk.org> Co-authored-by: Rickard Bäckman <rbackman@openjdk.org> Co-authored-by: Markus Grönlund <mgronlun@openjdk.org> Co-authored-by: Leonid Mesnik <lmesnik@openjdk.org> Co-authored-by: Serguei Spitsyn <sspitsyn@openjdk.org> Co-authored-by: Chris Plummer <cjplummer@openjdk.org> Co-authored-by: Coleen Phillimore <coleenp@openjdk.org> Co-authored-by: Robbin Ehn <rehn@openjdk.org> Co-authored-by: Stefan Karlsson <stefank@openjdk.org> Co-authored-by: Thomas Schatzl <tschatzl@openjdk.org> Co-authored-by: Sergey Kuksenko <skuksenko@openjdk.org> Reviewed-by: lancea, eosterlund, rehn, sspitsyn, stefank, tschatzl, dfuchs, lmesnik, dcubed, kevinw, amenkov, dlong, mchung, psandoz, bpb, coleenp, smarks, egahlin, mseledtsov, coffeys, darcy
92 lines
2.8 KiB
Java
92 lines
2.8 KiB
Java
/*
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* Copyright (c) 2021, 2022, Oracle and/or its affiliates. All rights reserved.
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* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
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*
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* This code is free software; you can redistribute it and/or modify it
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* under the terms of the GNU General Public License version 2 only, as
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* published by the Free Software Foundation. Oracle designates this
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* particular file as subject to the "Classpath" exception as provided
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* by Oracle in the LICENSE file that accompanied this code.
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*
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* This code is distributed in the hope that it will be useful, but WITHOUT
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* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
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* version 2 for more details (a copy is included in the LICENSE file that
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* accompanied this code).
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*
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* You should have received a copy of the GNU General Public License version
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* 2 along with this work; if not, write to the Free Software Foundation,
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* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
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*
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* Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
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* or visit www.oracle.com if you need additional information or have any
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* questions.
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*/
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package java.lang.ref;
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/**
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* An implementation of a ReferenceQueue that uses native monitors.
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* The use of java.util.concurrent.lock locks interacts with various mechanisms,
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* such as virtual threads and ForkJoinPool, that might not be appropriate for some
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* low-level mechanisms, in particular MethodType's weak intern set.
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*/
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final class NativeReferenceQueue<T> extends ReferenceQueue<T> {
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public NativeReferenceQueue() {
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super(0);
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}
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private static class Lock { };
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private final Lock lock = new Lock();
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@Override
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void signal() {
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lock.notifyAll();
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}
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@Override
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void await() throws InterruptedException {
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lock.wait();
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}
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@Override
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void await(long timeoutMillis) throws InterruptedException {
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lock.wait(timeoutMillis);
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}
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@Override
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boolean enqueue(Reference<? extends T> r) {
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synchronized(lock) {
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return enqueue0(r);
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}
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}
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@Override
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public Reference<? extends T> poll() {
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if (headIsNull())
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return null;
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synchronized(lock) {
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return poll0();
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}
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}
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@Override
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public Reference<? extends T> remove(long timeout)
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throws IllegalArgumentException, InterruptedException {
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if (timeout < 0)
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throw new IllegalArgumentException("Negative timeout value");
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if (timeout == 0)
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return remove();
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synchronized(lock) {
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return remove0(timeout);
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}
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}
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@Override
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public Reference<? extends T> remove() throws InterruptedException {
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synchronized(lock) {
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return remove0();
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}
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}
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}
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