fifo_async.rb

# hangs, same as MN threads
# RUBY_MN_THREADS=1 make test-all TESTS="--name=TestIO#test_open_fifo_does_not_block_other_threads"

require "tempfile"
require "async"

def mkcdtmpdir
  Dir.mktmpdir {|d|
    Dir.chdir(d) {
      yield
    }
  }
end

mkcdtmpdir {
  File.mkfifo("fifo")

  Async do |task|
    t1 = task.async {
      open("fifo", "r") {|r|
        r.read
      }
    }
    t2 = task.async {
      open("fifo", "w") {|w|
        w.write "foo"
      }
    }
    # Hangs indefinitely
    puts t1.wait
  end
}