RFR: 8324983: race in CompileBroker::possibly_add_compiler_threads

[Vladimir Kozlov]

On Wed, 31 Jan 2024 21:35:05 GMT, Tom Rodriguez <never at openjdk.org> wrote:

> The number of active compiler threads is decremented before the compiler thread has actually activated so possibly_add_compiler_thread might start a new thread on the existing JavaThread.  This adds a check that it's really exiting before proceeding and some new guarantees that ensure threads aren't started on top running threads.

Good.

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Marked as reviewed by kvn (Reviewer).

PR Review: https://git.openjdk.org/jdk/pull/17662#pullrequestreview-1855291021