[omworld-jdk] Integrated: 8326761: Lilliput: OMWorld: Fix invalid markWord transition

Tue Feb 27 10:50:02 UTC 2024

On Tue, 27 Feb 2024 09:11:29 GMT, Axel Boldt-Christmas <aboldtch at openjdk.org> wrote:

> `PlaceholderSynchronizer::inflate_and_enter` currently performs an invalid transition of the markWord away from monitor. This may lead to an ABA issue.
> 
> This got opportunistically added at some point to avoid spinning on the deflation thread progress. The issue of guaranteed progress is not something that has been observed as an issue. If guaranteed progress turns out to be required there are solutions which do not have ABA issues, but it requires extra state in the already heavily contested markWord.
> 
> The yielding and spinning will be evaluated in a separate issue.

This pull request has now been integrated.

Changeset: ff713d98
Author:    Axel Boldt-Christmas <aboldtch at openjdk.org>
URL:       https://git.openjdk.org/lilliput/commit/ff713d988e147b6dd35540cb2a93abf4a01dcbdc
Stats:     10 lines in 1 file changed: 0 ins; 8 del; 2 mod

8326761: Lilliput: OMWorld: Fix invalid markWord transition

Reviewed-by: rkennke

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PR: https://git.openjdk.org/lilliput/pull/138