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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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55
src/java.base/share/classes/java/io/Reader.java
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@ -1,5 +1,5 @@
/*
* Copyright (c) 1996, 2021, Oracle and/or its affiliates. All rights reserved.
* Copyright (c) 1996, 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
@ -25,10 +25,10 @@
package java.io;
import java.nio.CharBuffer;
import java.nio.ReadOnlyBufferException;
import java.util.Objects;
import jdk.internal.misc.InternalLock;
/**
* Abstract class for reading character streams. The only methods that a
@ -170,6 +170,21 @@ public abstract class Reader implements Readable, Closeable {
this.lock = lock;
}
/**
* For use by BufferedReader to create a character-stream reader that uses an
* internal lock when BufferedReader is not extended and the given reader is
* trusted, otherwise critical sections will synchronize on the given reader.
*/
Reader(Reader in) {
Class<?> clazz = in.getClass();
if (getClass() == BufferedReader.class &&
(clazz == InputStreamReader.class || clazz == FileReader.class)) {
this.lock = InternalLock.newLockOr(in);
} else {
this.lock = in;
}
}
/**
* Attempts to read characters into the specified character buffer.
* The buffer is used as a repository of characters as-is: the only
@ -297,21 +312,35 @@ public abstract class Reader implements Readable, Closeable {
public long skip(long n) throws IOException {
if (n < 0L)
throw new IllegalArgumentException("skip value is negative");
int nn = (int) Math.min(n, maxSkipBufferSize);
synchronized (lock) {
if ((skipBuffer == null) || (skipBuffer.length < nn))
skipBuffer = new char[nn];
long r = n;
while (r > 0) {
int nc = read(skipBuffer, 0, (int)Math.min(r, nn));
if (nc == -1)
break;
r -= nc;
Object lock = this.lock;
if (lock instanceof InternalLock locker) {
locker.lock();
try {
return implSkip(n);
} finally {
locker.unlock();
}
} else {
synchronized (lock) {
return implSkip(n);
}
return n - r;
}
}
private long implSkip(long n) throws IOException {
int nn = (int) Math.min(n, maxSkipBufferSize);
if ((skipBuffer == null) || (skipBuffer.length < nn))
skipBuffer = new char[nn];
long r = n;
while (r > 0) {
int nc = read(skipBuffer, 0, (int)Math.min(r, nn));
if (nc == -1)
break;
r -= nc;
}
return n - r;
}
/**
* Tells whether this stream is ready to be read.
*