local function my_function( ) -- this is just a demo function
        while true do
                local event, key = coroutine.yield( ) -- this stops the coroutine and waits for it to be resumed. It will set event, key to the arguments that it is resumed with
                if event == "char" then
                        print( key )
                else
                        error( "You didn't press a key!" )
                end
        end
end
local function my_other_function( )
        while true do
                sleep( 10000 ) -- would normally make the other function wait 10000 seconds
        end
end
local my_coroutine = coroutine.create( my_function ) -- creates a coroutine from my_function
local my_other_coroutine = coroutine.create( my_other_function ) -- ditto
while true do -- an infinite loop
        local event = { os.pullEvent("char") } -- captures the event in a table
        local ok, err = coroutine.resume( my_coroutine, unpack( event ) ) -- runs the coroutine with the event like [event, key, etc]
        coroutine.resume( my_other_coroutine) -- runs this too, and when sleep is called, it stops running because sleep->os.pullEvent->os.pullEventRaw->coroutine.yield( )
        if not ok then -- if the coroutine errored then...
                print( err ) -- print the error
                break -- exit from the loop
        end
end