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8287496: Alternative virtual thread implementation that maps to OS thread

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Reviewed-by: rehn, mchung
This commit is contained in:
Alan Bateman 2022-06-02 09:02:37 +00:00
parent 199832a710
commit 6ff2d89ea1
72 changed files with 694 additions and 173 deletions
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38
src/java.base/share/classes/java/lang/VirtualThread.java
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@ -62,7 +62,7 @@ import static java.util.concurrent.TimeUnit.*;
* A thread that is scheduled by the Java virtual machine rather than the operating
* system.
*/
final class VirtualThread extends Thread {
final class VirtualThread extends BaseVirtualThread {
private static final Unsafe U = Unsafe.getUnsafe();
private static final ContinuationScope VTHREAD_SCOPE = new ContinuationScope("VirtualThreads");
private static final ForkJoinPool DEFAULT_SCHEDULER = createDefaultScheduler();
@ -148,7 +148,7 @@ final class VirtualThread extends Thread {
* @param task the task to execute
*/
VirtualThread(Executor scheduler, String name, int characteristics, Runnable task) {
super(name, characteristics);
super(name, characteristics, /*bound*/ false);
Objects.requireNonNull(task);
// choose scheduler if not specified
@ -480,23 +480,15 @@ final class VirtualThread extends Thread {
// do nothing
}
/**
* Parks the current virtual thread until unparked or interrupted.
*/
static void park() {
if (currentThread() instanceof VirtualThread vthread) {
vthread.doPark();
} else {
throw new WrongThreadException();
}
}
/**
* Parks until unparked or interrupted. If already unparked then the parking
* permit is consumed and this method completes immediately (meaning it doesn't
* yield). It also completes immediately if the interrupt status is set.
*/
private void doPark() {
@Override
void park() {
assert Thread.currentThread() == this;
// complete immediately if parking permit available or interrupted
if (getAndSetParkPermit(false) || interrupted)
return;
@ -513,20 +505,6 @@ final class VirtualThread extends Thread {
}
}
/**
* Parks the current virtual thread up to the given waiting time or until
* unparked or interrupted.
*
* @param nanos the maximum number of nanoseconds to wait
*/
static void parkNanos(long nanos) {
if (currentThread() instanceof VirtualThread vthread) {
vthread.doParkNanos(nanos);
} else {
throw new WrongThreadException();
}
}
/**
* Parks up to the given waiting time or until unparked or interrupted.
* If already unparked then the parking permit is consumed and this method
@ -535,7 +513,8 @@ final class VirtualThread extends Thread {
*
* @param nanos the maximum number of nanoseconds to wait.
*/
private void doParkNanos(long nanos) {
@Override
void parkNanos(long nanos) {
assert Thread.currentThread() == this;
// complete immediately if parking permit available or interrupted
@ -638,6 +617,7 @@ final class VirtualThread extends Thread {
* not to block.
* @throws RejectedExecutionException if the scheduler cannot accept a task
*/
@Override
@ChangesCurrentThread
void unpark() {
Thread currentThread = Thread.currentThread();