RFR: 8373497: SpinCriticalSection should use SpinYield

Thu Dec 11 09:17:58 UTC 2025

Hi, please consider the following changes:

The original code of `Thread::SpinAqcuire()` was moved into a RAII object `SpinCriticalSection` in https://bugs.openjdk.org/browse/JDK-8366671

It to a great extent duplicates the code of the `SpinYield` class, which is more flexible. In this PR the duplication is removed as `SpinCriticalSection` now makes uses of  `SpinYield`.

Tested in tiers 1-3.

Extended performance testing has shown that the change is neutral.

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Commit messages:
 - 8373497: SpinCriticalSection should use SpinYield

Changes: https://git.openjdk.org/jdk/pull/28763/files
  Webrev: https://webrevs.openjdk.org/?repo=jdk&pr=28763&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8373497
  Stats: 18 lines in 1 file changed: 3 ins; 14 del; 1 mod
  Patch: https://git.openjdk.org/jdk/pull/28763.diff
  Fetch: git fetch https://git.openjdk.org/jdk.git pull/28763/head:pull/28763

PR: https://git.openjdk.org/jdk/pull/28763