RFR: 8229517: Support for optional asynchronous/buffered logging [v19]

[Xin Liu]

On Sat, 22 May 2021 21:27:59 GMT, Albert Mingkun Yang <ayang at openjdk.org> wrote:

>> Xin Liu has updated the pull request incrementally with one additional commit since the last revision:
>> 
>>   Update according to reviewers' feedback (Part-2).
>
> src/hotspot/share/logging/logAsyncWriter.cpp line 134:
> 
>> 132:     _buffer.pop_all(&logs);
>> 133:     // append meta-messages of dropped counters
>> 134:     _stats.iterate(&dropped_counters_iter);
> 
> Any particular reason why the iterator is *not* declared right above its usage? IOW, why not
> 
> 
> _buffer.pop_all(&logs);
> AsyncLogMapIterator dropped_counters_iter(logs);
> _stats.iterate(&dropped_counters_iter);

yes, it works.  I will update it. 
I unconsciously wrote code in C style. ie. declarations come first, code snippet follows.

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