> Classes in the `java.lang.ref` package would benefit from an update to bring > the spec in line with how the VM already behaves. The changes would focus on > _happens-before_ edges at some key points during reference processing. > > A couple key things we want to be able to say are: > - `Reference.reachabilityFence(x)` _happens-before_ reference processing > occurs for 'x'. > - `Cleaner.register()` _happens-before_ the Cleaner thread runs the > registered cleaning action. > > This will bring Cleaner in line (or close) with the memory visibility > guarantees made for finalizers in [JLS > 17.4.5](https://docs.oracle.com/javase/specs/jls/se18/html/jls-17.html#jls-17.4.5): > _"There is a happens-before edge from the end of a constructor of an object > to the start of a finalizer (ยง12.6) for that object."_
Brent Christian has updated the pull request incrementally with one additional commit since the last revision: Elaborate on 'surprising and undesirable effects' in reachabilityFence() ------------- Changes: - all: https://git.openjdk.org/jdk/pull/16644/files - new: https://git.openjdk.org/jdk/pull/16644/files/80a3973a..3df288a5 Webrevs: - full: https://webrevs.openjdk.org/?repo=jdk&pr=16644&range=14 - incr: https://webrevs.openjdk.org/?repo=jdk&pr=16644&range=13-14 Stats: 29 lines in 1 file changed: 11 ins; 0 del; 18 mod Patch: https://git.openjdk.org/jdk/pull/16644.diff Fetch: git fetch https://git.openjdk.org/jdk.git pull/16644/head:pull/16644 PR: https://git.openjdk.org/jdk/pull/16644
