Higher resolution time functions

I would love to have a way to measure the passage of time with greater resolution than the 50ms that os.clock() provides (due to os.clock() advancing on 20Hz server ticks.) I don't care whether it's possible to determine 'real world' time.

I have a few things I'd like to use this for, but perhaps the most generally useful one is determining the relative CPU usage of a few coroutines; for example:

[...]
event = { os.pullEventRaw() }
for _, task in pairs(task_table) do
  start_time = os.clock()
  result = { coroutine.resume(task.coroutine, unpack(event)) }
  task.cpu_time = task.cpu_time + (os.clock() - start_time)
  [...]
done
[...]

This example works, but task.cpu_time gains up to ±50ms of error on every iteration (every event in this case). The worst cases are:

• The coroutine takes 49ms to run but os.clock() does not advance, causing the code to lose all 49ms and record 0.
• The coroutine takes <1ms to run but os.clock() advances (CC computers do not run in lock step with server ticks), causing the code to record 50ms.

Nah. The time is based on server ticks - as it should be. Anything else just doesn't make sense in the Minecraft context.