RFR: JDK-8303742: CompletableFuture.orTimeout leaks if the future completes exceptionally

[Andrey Turbanov]

On Thu, 16 Mar 2023 13:37:10 GMT, Viktor Klang <duke at openjdk.org> wrote:

> Addresses the situation where exceptional completion of `orTimeout`:ed CompletableFutures wouldn't cancel the timeout task which could lead to memory leaks if done frequently enough with long enough timeout durations.
> 
> Fix discussed with @DougLea

test/jdk/java/util/concurrent/CompletableFuture/CompletableFutureOrTimeoutExceptionallyTest.java line 45:

> 43:         var startTime = System.currentTimeMillis();
> 44:         var testRunTime = Duration.ofSeconds(10).toMillis();
> 45:         while((System.currentTimeMillis() - startTime) < testRunTime) {

Suggestion:

        while ((System.currentTimeMillis() - startTime) < testRunTime) {

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PR: https://git.openjdk.org/jdk/pull/13059