[ruby-core:101524] [Ruby master Feature#17404] Ractor `move:` API to allow shareability check

Issue #17404 has been updated by ko1 (Koichi Sasada).


marcandre (Marc-Andre Lafortune) wrote in #note-2:
> ko1 (Koichi Sasada) wrote in #note-1:
> > `#send_ref(message)` and raise an error if message is not a sharable?
> 
> There would be an easy way to deep-copy or deep-move an object, right? If you mean that the default should be `pass: :share`, then that seems fine by me.

not sure what you mean. I mean:

```ruby
def send_ref(obj)
  raise unless Ractor.shareable?(obj)
  send(obj)
end
```

> We have to consider impact for passing arguments to `Ractor.new(...)`. Right now these are copied; would it also raise if the arguments are not shareable? Would you add `pass:` option there too (see #17286)?

I guess it is different topic.

----------------------------------------
Feature #17404: Ractor `move:` API to allow shareability check
https://bugs.ruby-lang.org/issues/17404#change-89309

* Author: marcandre (Marc-Andre Lafortune)
* Status: Open
* Priority: Normal
* Assignee: ko1 (Koichi Sasada)
----------------------------------------
I'd like to `ractor.send(message)` and express that `message` should be shareable. Currently I'm given two choices: `move: true` and `move: false` / nothing, neither of which have an effect if my `message` is shareable, and neither of which will tell me in case there's a bug in my program and `message` is not shareable.

Could we consider a slightly different API (for 3.0 or 3.1)?

```ruby
ractor.send(message, pass: :copy) # => like current `move: false`
ractor.send(message, pass: :move) # => like current `move: true`
ractor.send(message, pass: :share) # => raise in case message is not shareable
ractor.send(message) # => same as `pass: :copy`
```



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