From: aladjev.andrew@...
Date: 2020-12-14T23:02:45+00:00
Subject: [ruby-core:101459] [Ruby master Bug#17394] TCPServer is not thread	safe on win32

Issue #17394 has been updated by puchuu (Andrew Aladjev).


PS This issue is not 100% reproducible, please try to run script several times, thank you.

----------------------------------------
Bug #17394: TCPServer is not thread safe on win32
https://bugs.ruby-lang.org/issues/17394#change-89228

* Author: puchuu (Andrew Aladjev)
* Status: Open
* Priority: Normal
* ruby -v: 2.7.1
* Backport: 2.5: UNKNOWN, 2.6: UNKNOWN, 2.7: UNKNOWN
----------------------------------------
Hello, it looks like win32 version of TCPServer is not thread safe. I've extracted the following code from project:

``` ruby
require "socket"
require "parallel"

::Parallel.each(1..2, :in_threads => 2) do
  ::TCPServer.open 0 do |server|
    thread = ::Thread.new { server.accept.close }
    ::TCPSocket.open "localhost", server.addr[1]
    thread.join
  end
end
```

It returns:

```
in `accept': Bad file descriptor - not a socket file descriptor (Errno::EBADF)
```

You can fix this code by using `:in_threads => 1`. This is unique windows issue: GNU/Linux, FreeBSD and OSX works perfect. I think something is wrong in `win32` folder of ruby source code.

Can you please assign this issue to the developer familiar with `win32` folder? Thank you.



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