RFR: 8267952: async logging supports to dynamically change tags and decorators

[David Holmes]

On Tue, 8 Jun 2021 03:10:56 GMT, Xin Liu <xliu at openjdk.org> wrote:

> Support dynamic reconfiguration for async logging. 2 unittests are provided.
> The regression test discovers a race condition in LogTagSet::log() even with
> synchronous logging. It's not MT-safe if context switch happens between the
> creation of LogDecorations  and LogOutputList::Iterator. fixed.

src/hotspot/share/logging/logTagSet.cpp line 79:

> 77:   LogDecorations decorations(level, *this, _decorators);
> 78: 
> 79:   for (; it != _output_list.end(); it++) {

The reordering here needs a comment, else someone will be tempted to restore it to the original form.

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PR: https://git.openjdk.java.net/jdk/pull/4408