Right, the example provided by Rémi shows the issue. The null marker needs to
be written atomically with the payload.
Best regards,
Tobias
On 11/6/25 2:02 PM, Remi Forax wrote:
Hello,
as far as i remember, the problem is that you can resurrect a value,
for example with a Long
Thread1
a.x = new Long(12);
a.x = null;
IO.println(a.x); //12
Thread2
IO.println(a.x); // null
a.x = new Long(77); // descheduled in between writing the maker and
writing the long
The thread1 can see the Long(12) to be resurrected, something that is not
possible with references.
regards,
Rémi
------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------
*From: *"Quân Anh Mai" <[email protected]>
*To: *"David Alayachew" <[email protected]>
*Cc: *"valhalla-dev" <[email protected]>
*Sent: *Thursday, November 6, 2025 3:52:41 AM
*Subject: *Re: About flattening a nullable j.l.Long
Ah yes, my bad, it is https://github.com/openjdk/valhalla/pull/1720
<https://github.com/openjdk/valhalla/pull/1720>
On Thu, 6 Nov 2025 at 07:26, David Alayachew <[email protected]
<mailto:[email protected]>> wrote:
Just a heads up, your [1] is a dead link. Can you try to put the url in
again?
On Wed, Nov 5, 2025, 2:06 PM Quân Anh Mai <[email protected]
<mailto:[email protected]>> wrote:
Hi,
Currently, I'm having a PR that allows flattening of a nullable
value class with a 64-bit payload [1]. Dan Smith told me that some ideas along
these lines were discussed a few years ago, and the consensus was that it was a
dead end. May I ask what the concerns were, and whether they are still relevant
now?
Thanks a lot,
Quan Anh
