ruby-lxc/test/test_helpers.rb

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require 'lxc'
require 'test/unit/assertions'
module TestHelpers
def assert_long_running_function_does_not_block_ruby(&block)
r, w = IO.pipe
begin
# Write something after a very short period, but only if Ruby isn't blocked!
t = Thread.new do
sleep(0.001)
# Sleep twice so that if the function is blocking and we wake up just
# after block.call(c) somehow, we will go back to sleep briefly and
# allow B to be written
sleep(0.001)
w.write('A')
end
# Call the function and see if Ruby gets blocked
block.call
w.write('B')
chars = r.read(2)
assert(chars == 'AB', "Expected thread to write before block finished, but it did not. Expected 'AB', got '#{chars}'")
ensure
r.close
w.close
end
end
end