On Wed, 15 Jul 2026 19:35:18 GMT, Jorn Vernee <[email protected]> wrote:
> The methods `load()`, `unload()`, `isLoaded()`, and `force()` in > `MemorySegment` currently delegate to `ScopedMemoryAccess` through a set of > `@Scoped` methods, after which the implementation calls into > `java.nio.MappedMemoryUtils`. This means that, when a shared scope is closed > during a call to one of these methods, an exception can be installed at any > point during the execution of the util method. > > The problem is that some parts of these methods are not able to handle such > exceptions being installed. > > We've had some previous discussion about these methods not really needing to > be `@Scoped` in the first place, but instead being able to rely on paired > acquire/release of the session being accessed. This code is not as > performance critical compared to a scoped memory access, since we're doing a > native call any way. > > To avoid issues with exceptions being installed in surprising places, this > patch switches the named methods to use acquire/release instead of being > `@Scoped`. This changes the behavior of these methods slightly: they now keep > the scope alive during the execution of the method. I've updated the doc, > borrowing from existing text in the `Linked::downcallHandle` docs, to explain > that a scope closure may now fail during the execution of one of these > methods. > > Does this seem like the right tradeoff? > > --------- > - [x] I confirm that I make this contribution in accordance with the [OpenJDK > Interim AI Policy](https://openjdk.org/legal/ai). This pull request has now been integrated. Changeset: 98b3e480 Author: Jorn Vernee <[email protected]> URL: https://git.openjdk.org/jdk/commit/98b3e4806c3d417920a207c5d52b32d810225f5a Stats: 186 lines in 4 files changed: 126 ins; 39 del; 21 mod 8387723: Scoped memory async exceptions can be delivered inside FJP compensation code Reviewed-by: pminborg, mcimadamore ------------- PR: https://git.openjdk.org/jdk/pull/31918
