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Bug #17996
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Cygwin: thread + pipe behavior since Ruby 2.6
Description
The following one-liner is the repro named thread-pipe-read-close.rb the aim of which is essentially the same as that of "IO#close raises an IOError with a clear message" test in spec/ruby/core/io/close_spec.rb.
r, w = IO.pipe; Thread.new{ r.read }; sleep 0.5; r.close
Run on Cygwin with Ruby 2.6 or later, this hangs up indefinitely consuming a full core. On the other hand, with Ruby 2.5.9p229 it works as expected.
$ miniruby25 -v
ruby 2.5.9p229 (2021-04-05 revision 67939) [x86_64-cygwin]
$ miniruby25 thread-pipe-read-close.rb
#<Thread:0x000000080006c9f0@thread-pipe-read-close.rb:2 run> terminated with exception (report_on_exception is true):
Traceback (most recent call last):
1: from thread-pipe-read-close.rb:2:in `block in <main>'
thread-pipe-read-close.rb:2:in `read': IOError
$ miniruby -v
ruby 3.1.0dev (2021-06-10T23:31:51Z master 9210f8df7f) [x86_64-cygwin]
$ miniruby thread-pipe-read-close.rb
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