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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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49
src/java.base/share/classes/sun/nio/ch/ServerSocketChannelImpl.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
@ -103,6 +103,13 @@ class ServerSocketChannelImpl
// Our socket adaptor, if any
private ServerSocket socket;
// True if the channel's socket has been forced into non-blocking mode
// by a virtual thread. It cannot be reset. When the channel is in
// blocking mode and the channel's socket is in non-blocking mode then
// operations that don't complete immediately will poll the socket and
// preserve the semantics of blocking operations.
private volatile boolean forcedNonBlocking;
// -- End of fields protected by stateLock
ServerSocketChannelImpl(SelectorProvider sp) throws IOException {
@ -388,6 +395,7 @@ class ServerSocketChannelImpl
boolean blocking = isBlocking();
try {
begin(blocking);
configureSocketNonBlockingIfVirtualThread();
n = implAccept(this.fd, newfd, saa);
if (blocking) {
while (IOStatus.okayToRetry(n) && isOpen()) {
@ -514,27 +522,28 @@ class ServerSocketChannelImpl
}
/**
* Adjust the blocking. acceptLock must already be held.
* Adjusts the blocking mode.
*/
private void lockedConfigureBlocking(boolean block) throws IOException {
assert acceptLock.isHeldByCurrentThread();
synchronized (stateLock) {
ensureOpen();
IOUtil.configureBlocking(fd, block);
// do nothing if virtual thread has forced the socket to be non-blocking
if (!forcedNonBlocking) {
IOUtil.configureBlocking(fd, block);
}
}
}
/**
* Adjusts the blocking mode if the channel is open. acceptLock must already
* be held.
*
* @return {@code true} if the blocking mode was adjusted, {@code false} if
* the blocking mode was not adjusted because the channel is closed
* Attempts to adjust the blocking mode if the channel is open.
* @return {@code true} if the blocking mode was adjusted
*/
private boolean tryLockedConfigureBlocking(boolean block) throws IOException {
assert acceptLock.isHeldByCurrentThread();
synchronized (stateLock) {
if (isOpen()) {
// do nothing if virtual thread has forced the socket to be non-blocking
if (!forcedNonBlocking && isOpen()) {
IOUtil.configureBlocking(fd, block);
return true;
} else {
@ -543,6 +552,20 @@ class ServerSocketChannelImpl
}
}
/**
* Ensures that the socket is configured non-blocking when on a virtual thread.
*/
private void configureSocketNonBlockingIfVirtualThread() throws IOException {
assert acceptLock.isHeldByCurrentThread();
if (!forcedNonBlocking && Thread.currentThread().isVirtual()) {
synchronized (stateLock) {
ensureOpen();
IOUtil.configureBlocking(fd, false);
forcedNonBlocking = true;
}
}
}
/**
* Closes the socket if there are no accept in progress and the channel is
* not registered with a Selector.
@ -583,8 +606,12 @@ class ServerSocketChannelImpl
if (!tryClose()) {
long th = thread;
if (th != 0) {
nd.preClose(fd);
NativeThread.signal(th);
if (NativeThread.isVirtualThread(th)) {
Poller.stopPoll(fdVal);
} else {
nd.preClose(fd);
NativeThread.signal(th);
}
}
}
}