[ruby-core:105149] [Ruby master Bug#17394] TCPServer is not thread safe on win32

Issue #17394 has been updated by nagachika (Tomoyuki Chikanaga).

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

Thank you for preparing backport PRs including bump a patchlevel.
I resolve conflict and merge into ruby_3_0 at 261a0e0e4a3202ca004eddc3cc2cefc9e8d0a90a.

----------------------------------------
Bug #17394: TCPServer is not thread safe on win32
https://bugs.ruby-lang.org/issues/17394#change-93556

* Author: puchuu (Andrew Aladjev)
* Status: Closed
* Priority: Normal
* ruby -v: 2.7.1
* Backport: 2.6: REQUIRED, 2.7: REQUIRED, 3.0: DONE
----------------------------------------
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.

---Files--------------------------------
Screenshot_20201215_020316.png (11.4 KB)
4220.patch (7.68 KB)


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