[ruby-core:116003] [Ruby master Bug#20146] Code using Ractor with env `RUBY_MAX_CPU=1` ends with unreachable

Issue #20146 has been reported by shia (Sangyong Sim).

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Bug #20146: Code using Ractor with env `RUBY_MAX_CPU=1` ends with unreachable
https://bugs.ruby-lang.org/issues/20146

* Author: shia (Sangyong Sim)
* Status: Open
* Priority: Normal
* ruby -v: ruby 3.4.0dev
* Backport: 3.0: UNKNOWN, 3.1: UNKNOWN, 3.2: UNKNOWN, 3.3: UNKNOWN
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## Reproducible code

```rb
# sample-code.rb
Ractor.new { 1 }
```

```bash
RUBY_MAX_CPU=1 ruby sample-code.rb # This will not end with exit code 0
RUBY_MAX_CPU=2 ruby sample-code.rb # This ends with exit code 0 as expected
```

## Expected

process with RUBY_MAX_CPU=1 exits successfully as same as RUBY_MAX_CPU more than 1.



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