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8338146: Improve Exchanger performance with VirtualThreads

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Reviewed-by: alanb
This commit is contained in:
Doug Lea 2024-08-21 18:22:24 +00:00
parent e297e8817f
commit ab8071d280
3 changed files with 251 additions and 329 deletions
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4
src/java.base/share/classes/java/util/concurrent/LinkedTransferQueue.java
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@ -426,8 +426,8 @@ public class LinkedTransferQueue<E> extends AbstractQueue<E>
long deadline = (timed) ? System.nanoTime() + ns : 0L;
boolean upc = isUniprocessor; // don't spin but later recheck
Thread w = Thread.currentThread();
if (w.isVirtual()) // don't spin
spin = false;
if (spin && ForkJoinWorkerThread.hasKnownQueuedWork())
spin = false; // don't spin
int spins = (spin & !upc) ? SPINS : 0; // negative when may park
while ((m = item) == e) {
if (spins >= 0) {