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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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11
src/java.base/share/classes/java/nio/MappedMemoryUtils.java
View file

@ -25,11 +25,11 @@
package java.nio;
import jdk.internal.misc.Unsafe;
import java.io.FileDescriptor;
import java.io.IOException;
import java.io.UncheckedIOException;
import jdk.internal.misc.Blocker;
import jdk.internal.misc.Unsafe;
/* package */ class MappedMemoryUtils {
@ -96,10 +96,15 @@ import java.io.UncheckedIOException;
} else {
// force writeback via file descriptor
long offset = mappingOffset(address, index);
long mappingAddress = mappingAddress(address, offset, index);
long mappingLength = mappingLength(offset, length);
long comp = Blocker.begin();
try {
force0(fd, mappingAddress(address, offset, index), mappingLength(offset, length));
force0(fd, mappingAddress, mappingLength);
} catch (IOException cause) {
throw new UncheckedIOException(cause);
} finally {
Blocker.end(comp);
}
}
}

4
src/java.base/share/classes/java/nio/channels/spi/AbstractSelectableChannel.java
View file

@ -1,5 +1,5 @@
/*
* Copyright (c) 2000, 2019, Oracle and/or its affiliates. All rights reserved.
* Copyright (c) 2000, 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
@ -76,7 +76,7 @@ public abstract class AbstractSelectableChannel
// Lock for registration and configureBlocking operations
private final Object regLock = new Object();
// True when non-blocking, need regLock to change;
// True when the channel is configured non-blocking, need regLock to change;
private volatile boolean nonBlocking;
/**

26
src/java.base/share/classes/java/nio/charset/Charset.java
View file

@ -1,5 +1,5 @@
/*
* Copyright (c) 2000, 2021, Oracle and/or its affiliates. All rights reserved.
* Copyright (c) 2000, 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
@ -25,6 +25,7 @@
package java.nio.charset;
import jdk.internal.misc.ThreadTracker;
import jdk.internal.misc.VM;
import sun.nio.cs.ThreadLocalCoders;
import sun.security.action.GetPropertyAction;
@ -47,6 +48,7 @@ import java.util.ServiceLoader;
import java.util.Set;
import java.util.SortedMap;
import java.util.TreeMap;
import java.util.jar.JarFile;
/**
@ -370,9 +372,17 @@ public abstract class Charset
};
}
// Thread-local gate to prevent recursive provider lookups
private static ThreadLocal<ThreadLocal<?>> gate =
new ThreadLocal<ThreadLocal<?>>();
private static class ThreadTrackHolder {
static final ThreadTracker TRACKER = new ThreadTracker();
}
private static Object tryBeginLookup() {
return ThreadTrackHolder.TRACKER.tryBegin();
}
private static void endLookup(Object key) {
ThreadTrackHolder.TRACKER.end(key);
}
@SuppressWarnings("removal")
private static Charset lookupViaProviders(final String charsetName) {
@ -388,12 +398,12 @@ public abstract class Charset
if (!VM.isBooted())
return null;
if (gate.get() != null)
Object key = tryBeginLookup();
if (key == null) {
// Avoid recursive provider lookups
return null;
}
try {
gate.set(gate);
return AccessController.doPrivileged(
new PrivilegedAction<>() {
public Charset run() {
@ -409,7 +419,7 @@ public abstract class Charset
});
} finally {
gate.set(null);
endLookup(key);
}
}