Ruby/Threads/Ruby Threads

threads = []
10.times do
  thread = Thread.new do
    10.times { |i| print i; $stdout.flush; sleep rand(2) }
  end
  threads << thread
end
threads.each { |thread| thread.join }

max = 10000
thr = Thread.new do
  sum = 0
  1.upto(max) { |i| sum += i }
  sum
end
puts thr.value

t = Thread.new do       # Run this block in a new thread
  File.read("data.txt") # Read a file in the background
end                     # File contents available as thread value

t1 = Thread.new do
  puts "Hello"
  sleep 2
  raise "some exception"
  puts "Goodbye"
end
t2 = Thread.new { sleep 100 }
sleep 2
puts "The End"