RFR: 8229517: Support for optional asynchronous/buffered logging [v17]

[Xin Liu]

On Fri, 21 May 2021 18:28:47 GMT, Albert Mingkun Yang <ayang at openjdk.org> wrote:

>> Yes, it's another historical problem. I used to have AsyncLogWriter::terminate(), but Thomas said I can avoid the complexity by leaving it alone. 
>> 
>> remove if not in use?
>
>> remove if not in use?
> 
> Yes, please.
> 
> Shouldn't this assertion be triggered as it is now? Why no failing tests?

it's because while (_state == ThreadState::Running) is a dead loop. 
Nobody attempts to terminate AsyncLog Thread.

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PR: https://git.openjdk.java.net/jdk/pull/3135