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authorJean Boussier <[email protected]>2025-05-22 14:01:46 +0200
committerJean Boussier <[email protected]>2025-06-12 07:58:16 +0200
commit3abdd4241fd5231a5711ce1b087d660c667ef30d (patch)
treeddcdd184ca6720bac671cf296a5b7474a22477f5 /coroutine/win32
parent166ff187bd2a84fddd7a633bdbdbcd4ae393c91e (diff)
Turn `rb_classext_t.fields` into a T_IMEMO/class_fieldsHEADmaster
This behave almost exactly as a T_OBJECT, the layout is entirely compatible. This aims to solve two problems. First, it solves the problem of namspaced classes having a single `shape_id`. Now each namespaced classext has an object that can hold the namespace specific shape. Second, it open the door to later make class instance variable writes atomics, hence be able to read class variables without locking the VM. In the future, in multi-ractor mode, we can do the write on a copy of the `fields_obj` and then atomically swap it. Considerations: - Right now the `RClass` shape_id is always synchronized, but with namespace we should likely mark classes that have multiple namespace with a specific shape flag.
Notes
Notes: Merged: https://github.com/ruby/ruby/pull/13411
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