ruby--ruby/bootstraptest/test_io.rb

assert_finish 5, %q{
  r, w = IO.pipe
  t1 = Thread.new { r.sysread(1) }
  t2 = Thread.new { r.sysread(1) }
  sleep 0.1
  w.write "a"
  sleep 0.1
  w.write "a"
}, '[ruby-dev:31866]'