[crac] RFR: CRaC: Fix fds opened for logging [v2]

[Radim Vansa]

On Mon, 2 Oct 2023 14:49:56 GMT, Jan Kratochvil <jkratochvil at openjdk.org> wrote:

>> CRaC: Fix fds opened for logging
>
> Jan Kratochvil has updated the pull request with a new target base due to a merge or a rebase. The incremental webrev excludes the unrelated changes brought in by the merge/rebase. The pull request contains eight additional commits since the last revision:
> 
>  - AsyncLogWriter: add stop() and resume()
>  - Merge branch 'crac' into crac-logfd
>  - b229ea41: <no commit message found>
>  - 8f161825: <no commit message found>
>  - d8a454cb: <no commit message found>
>  - Merge branch 'crac' into crac-logfd
>  - +testcase
>  - CRaC: Fix fds opened for logging

src/hotspot/share/runtime/crac.cpp line 431:

> 429:   Universe::heap()->finish_collection();
> 430: 
> 431:   AsyncLogWriter::instance()->flush();

As a non-java thread, AsyncLogWriter does not participate in the safepoint protocol. What happens if another non-java thread enqueues a message to be written while the output is closed?

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PR Review Comment: https://git.openjdk.org/crac/pull/113#discussion_r1337075009