RFR: 8340830: Console.readLine() and Console.printf() are mutually blocking [v8]

[Justin Lu]

On Tue, 3 Feb 2026 20:15:13 GMT, Naoto Sato <naoto at openjdk.org> wrote:

>> Fixing an issue in Console where write is blocked if other thread is waiting to read, which is caused by unnecessary read/write locks. Removing those would solve the problem, as the read/write synchronization is performed at the StreamEn/Decoder level. One unrelated change is to refactor double-checked locking with LazyConstant.
>
> Naoto Sato has updated the pull request incrementally with one additional commit since the last revision:
> 
>   Restores the original race condition

Marked as reviewed by jlu (Reviewer).

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PR Review: https://git.openjdk.org/jdk/pull/29493#pullrequestreview-3747851526