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pending = {}
function schedule(time, action)
pending[#pending+1] = {
time = time,
action = action
}
sort_by_time(pending)
end
function sort_by_time(array)
table.sort(array, function(e1, e2) return e1.time < e2.time end)
end
function wait(seconds)
coroutine.yield(seconds)
end
function run()
while #pending > 0 do
while os.clock() < pending[1].time do end -- busy-wait
local item = remove_first(pending)
local _, seconds = coroutine.resume(item.action)
if seconds then
later = os.clock() + seconds
schedule(later, item.action)
end
end
end
function remove_first(array)
result = array[1]
array[1] = array[#array]
array[#array] = nil
return result
end
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