[ruby-core:102841] [Ruby master Bug#17659] Ractor: can't call io/wait methods

Issue #17659 has been updated by naruse (Yui NARUSE).

Backport changed from 2.5: DONTNEED, 2.6: DONTNEED, 2.7: DONTNEED, 3.0: REQUIRED to 2.5: DONTNEED, 2.6: DONTNEED, 2.7: DONTNEED, 3.0: DONE

ruby_3_0 e050dd53230cb354e816415f8a937901f79ec395 merged revision(s) f6d5de8f33fe715d939e3e77b8ef73d88bcd6c9f.

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Bug #17659: Ractor: can't call io/wait methods
https://bugs.ruby-lang.org/issues/17659#change-90899

* Author: chucke (Tiago Cardoso)
* Status: Closed
* Priority: Normal
* ruby -v: 3.0.0
* Backport: 2.5: DONTNEED, 2.6: DONTNEED, 2.7: DONTNEED, 3.0: DONE
----------------------------------------
It seems that I can use IO.select inside a ractor, but not call IO.wait_writable, which seems odd.

```ruby
require "io/wait"
ractors = []
1.times do
  ractors << Ractor.new do
    $stdout.wait_writable(2) # this fails
    # but this works
    # IO.select(nil, [$stdout], nil, 2)
    $stdout.puts "wow"
  end
end
ractors.map(&:take)
```



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