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8284161: Implementation of Virtual Threads (Preview)

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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
This commit is contained in:
Alan Bateman 2022-05-07 08:06:16 +00:00
parent 5212535a27
commit 9583e3657e
1133 changed files with 95935 additions and 8335 deletions
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92
src/java.base/share/classes/java/lang/ref/NativeReferenceQueue.java Normal file
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/*
* Copyright (c) 2021, 2022, 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. Oracle designates this
* particular file as subject to the "Classpath" exception as provided
* by Oracle in the LICENSE file that accompanied this code.
*
* 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 java.lang.ref;
/**
* An implementation of a ReferenceQueue that uses native monitors.
* The use of java.util.concurrent.lock locks interacts with various mechanisms,
* such as virtual threads and ForkJoinPool, that might not be appropriate for some
* low-level mechanisms, in particular MethodType's weak intern set.
*/
final class NativeReferenceQueue<T> extends ReferenceQueue<T> {
public NativeReferenceQueue() {
super(0);
}
private static class Lock { };
private final Lock lock = new Lock();
@Override
void signal() {
lock.notifyAll();
}
@Override
void await() throws InterruptedException {
lock.wait();
}
@Override
void await(long timeoutMillis) throws InterruptedException {
lock.wait(timeoutMillis);
}
@Override
boolean enqueue(Reference<? extends T> r) {
synchronized(lock) {
return enqueue0(r);
}
}
@Override
public Reference<? extends T> poll() {
if (headIsNull())
return null;
synchronized(lock) {
return poll0();
}
}
@Override
public Reference<? extends T> remove(long timeout)
throws IllegalArgumentException, InterruptedException {
if (timeout < 0)
throw new IllegalArgumentException("Negative timeout value");
if (timeout == 0)
return remove();
synchronized(lock) {
return remove0(timeout);
}
}
@Override
public Reference<? extends T> remove() throws InterruptedException {
synchronized(lock) {
return remove0();
}
}
}