RFR: 8229517: Support for optional asynchronous/buffered logging [v22]

[Paul Hohensee]

On Thu, 27 May 2021 07:05:41 GMT, Xin Liu <xliu at openjdk.org> wrote:

>> This patch provides a buffer to store asynchrounous messages and flush them to
>> underlying files periodically.
>
> Xin Liu has updated the pull request incrementally with one additional commit since the last revision:
> 
>   Correct typos and add a comment for a corner case.
>   
>   Without that flush(), TEST='gtest:gtest:LogFileOutput*' can't pass
>   in async mode.

Still good.

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Marked as reviewed by phh (Reviewer).

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