RFR: 8373118: Test java/lang/Thread/virtual/Starvation.java timed out [v27]

[Viktor Klang]

On Sun, 18 Jan 2026 21:07:48 GMT, Doug Lea <dl at openjdk.org> wrote:

>> Changes signal filtering to avoid possible starvation
>
> Doug Lea has updated the pull request incrementally with one additional commit since the last revision:
> 
>   Simplify scan mode control by moving and reworking topLevelExec and throwing on trim

src/java.base/share/classes/java/util/concurrent/ForkJoinPool.java line 1271:

> 1269:                 }
> 1270:                 if (pred == null && pool != null)
> 1271:                     pool.signalWork(this, s); // may have appeared empty

@DougLea I presume we don't need to do the getReferenceAcquire if the pool is null?

If so, then we could do something like:


                boolean signal = pool != null && U.getReferenceAcquire(a, slotOffset(m & (s - 1))) == null;
                if (unlock != 1) {            // release external lock
                    U.putInt(this, PHASE, unlock);
                    U.storeFence();
                }
                if (signal)
                    pool.signalWork(this, s); // may have appeared empty

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PR Review Comment: https://git.openjdk.org/jdk/pull/28797#discussion_r2706064195