From: "fxn (Xavier Noria) via ruby-core" <ruby-core@...>
Date: 2023-02-05T08:00:50+00:00
Subject: [ruby-core:112220] [Ruby master Bug#19415] Incorrect circularity warning for concurrent requires

Issue #19415 has been reported by fxn (Xavier Noria).

----------------------------------------
Bug #19415: Incorrect circularity warning for concurrent requires
https://bugs.ruby-lang.org/issues/19415

* Author: fxn (Xavier Noria)
* Status: Open
* Priority: Normal
* Backport: 2.7: UNKNOWN, 3.0: UNKNOWN, 3.1: UNKNOWN, 3.2: UNKNOWN
----------------------------------------
This script performs 5 concurrent `require` calls to the same file:


```ruby
threads = []

5.times do
  threads << Thread.new {
    p require 'bar'
  }
end

threads.each(&:join)
```

The file `bar.rb` is simply

```ruby
sleep 0.1
```

Now, if you execute the main script with warnings enabled:

```
ruby -W2 -I. foo.rb
```

you'll see one `true` and four `false` as expected. But also four warnings:

```
circular require considered harmful - /Users/fxn/tmp/bar.rb
```

As you see, there isn't really a circular `require` going on, so the warning itself is incorrect. On the other hand, concurrent `require` calls for the same file is something routinely happening and supported.

I'd suggest that script should issue no warning.





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