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8188055: (ref) Add Reference::refersTo predicate

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Reviewed-by: mchung, pliden, rriggs, dholmes, ihse, smarks, alanb
This commit is contained in:
Kim Barrett 2020-11-04 09:18:23 +00:00
parent ab9192e463
commit 6023f6b1bf
13 changed files with 501 additions and 13 deletions
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10
src/java.base/share/classes/java/lang/ref/PhantomReference.java
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@ -1,5 +1,5 @@
/*
* Copyright (c) 1997, 2015, Oracle and/or its affiliates. All rights reserved.
* Copyright (c) 1997, 2020, Oracle and/or its affiliates. All rights reserved.
* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
*
* This code is free software; you can redistribute it and/or modify it
@ -60,6 +60,14 @@ public class PhantomReference<T> extends Reference<T> {
return null;
}
/* Override the implementation of Reference.refersTo.
* Phantom references are weaker than finalization, so the referent
* access needs to be handled differently for garbage collectors that
* do reference processing concurrently.
*/
@Override
native final boolean refersTo0(Object o);
/**
* Creates a new phantom reference that refers to the given object and
* is registered with the given queue.