text: import time
  
  from pypy.rlib.rtimer import read_timestamp
  from pypy.rpython.test.test_llinterp import interpret
  from pypy.translator.c.test.test_genc import compile
  
  def timer():
      t1 = read_timestamp()
      start = time.time()
      while time.time() - start < 0.1:
          # busy wait
          pass
      t2 = read_timestamp()
      return t2 - t1
  
  def test_timer():
      diff = timer()
      # We're counting ticks, verify they look correct
      assert diff > 1000
  
  def test_annotation():
      diff = interpret(timer, [])
      assert diff > 1000
  
  def test_compile_c():
      function = compile(timer, [])
      diff = function()
      assert diff > 1000