On Mon, 24 Oct 2022 12:16:54 GMT, Coleen Phillimore <cole...@openjdk.org> wrote:
> This change adds an option **EnableWaitForParallelLoad** to enable the legacy > behavior where the VM will manage synchronization for multiple threads > loading the same class using a non-parallel capable class loader that have > released the class loader lock. The VM will break the class loader lock for > parallel threads trying to load the class, and wait for the first thread that > initiated loading the class to complete. The subsequent threads will use the > result of the first thread, rather than get a LinkageError: duplicate class > definition for loading the class without synchronization. > Releasing the class loader lock was a common workaround for class loaders > that used a non-hierarchical delegation scheme to avoid deadlock, before > parallel capable class loading was added. > https://docs.oracle.com/en/java/javase/11/docs/api/java.base/java/lang/ClassLoader.html#registerAsParallelCapable() > > Tested with tier1-6 and internal applications. This pull request has now been integrated. Changeset: 76790ad2 Author: Coleen Phillimore <cole...@openjdk.org> URL: https://git.openjdk.org/jdk/commit/76790ad2427b777b470ef3e5474fa8df9f3bf875 Stats: 25 lines in 7 files changed: 14 ins; 1 del; 10 mod 8295673: Deprecate and disable legacy parallel class loading workaround for non-parallel-capable class loaders Reviewed-by: mchung, dholmes ------------- PR: https://git.openjdk.org/jdk/pull/10832
