How to read value of a variable "value x" (without sending bang to a "v x" obj)

Hi,
I have multiple "v x" in my patches.
Now, in my mxj object, I need value of x.

I DON'T want to have a trigger at input of "v x" which sends the value out every time it changes.

I just want to read value of "x" when I need, synchronously.

How I can do this in my own C external ?

Thanks
Chris