RFR: 8229517: Support for optional asynchronous/buffered logging [v20]

[Xin Liu]

On Mon, 24 May 2021 08:51:27 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:
>> 
>>   flush() waits until all pending logging IO operations are done.
>>   
>>   This patch support all gtests in async mode.
>>   make test TEST="gtest:all" TEST_OPTS='VM_OPTIONS=-Xlog:async'
>
> src/hotspot/share/logging/logAsyncWriter.hpp line 147:
> 
>> 145:     Initialized,
>> 146:     Running,
>> 147:     Terminated,
> 
> These two states can be removed now, right? If so, maybe having a binary state (`volatile bool _initialized`) is enough and easier to follow.

make sense.  I will update it along with the trywait() patch.

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