dispatch_examples.rb

require 'dispatch'
T=1
T0 = Time.now
def now
  (Time.now - T0)
end

p "Call Dispatch.sync with delay #{T} @ #{now}"
Dispatch.sync {sleep T; p "Waited for me"}
p "Finished calling sync @ #{now}"

puts
p "Call Dispatch.async with delay #{T} @ #{now}"
Dispatch.async {sleep T; p "Didn't wait for me"}
p "Finished calling async @ #{now}"
sleep 2*T

puts
p "Calling Dispatch.fork with delay #{T} @ #{now}"
g = Dispatch.fork {sleep T; p "Tell me when done"}
p "Calling Dispatch.group with delay #{T} @ #{now}"
Dispatch.group(g) {sleep T; p "Me too"}
p "Calling Group.join to wait for both..."
g.wait
p "All done @ #{now}"