RFR: 8315948: JDK-8315818 broke Xcomp on libgraal

[Tom Rodriguez]

On Fri, 8 Sep 2023 18:19:46 GMT, Doug Simon <dnsimon at openjdk.org> wrote:

> This PR fixes a regression caused by [JDK-8315818](https://bugs.openjdk.org/browse/JDK-8315818). Libgraal must not unblock a thread waiting on a blocking compilation, even if libgraal itself is not yet initialized. Initialization of libgraal is not prone to the same initialization deadlocks that jargraal can cause.

Marked as reviewed by never (Reviewer).

src/hotspot/share/compiler/compileBroker.cpp line 1250:

> 1248:         }
> 1249:       } else {
> 1250:         // In libjvmci, JVMCI initialization should not deadlock with other threads

Can't this comment just go before the guarding if?  An empty else at the every end is harder to connect with the guarding condition.

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PR Review: https://git.openjdk.org/jdk/pull/15643#pullrequestreview-1618046617
PR Review Comment: https://git.openjdk.org/jdk/pull/15643#discussion_r1320205127