RFR: 8358496: Concurrent reading from Socket with timeout executes sequentially [v2]

[Daniel Fuchs]

On Tue, 3 Jun 2025 16:10:38 GMT, Alan Bateman <alanb at openjdk.org> wrote:

>> If several threads attempt to read from a Socket's input stream at the same time then all but the winner will block trying to acquire the read lock.  This is okay for untimed-reads but surprising for timed-reads as the timeout is only effective after acquiring the lock. The SocketImpl is changed so that the timeout applies to the total time waiting to acquire and read.
>> 
>> A new test is added to the existing java/net/Socket/Timeouts test. It is migrated from TestNG to a JUnit test as a drive-by change - it's mostly mechanical and the changes kept as minimal as possible.
>
> Alan Bateman has updated the pull request incrementally with one additional commit since the last revision:
> 
>   Make test comment cleaner

Marked as reviewed by dfuchs (Reviewer).

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PR Review: https://git.openjdk.org/jdk/pull/25614#pullrequestreview-2893258189