Cmpsetatom
From OpenEUO
local bsuccess = cmpsetatom(str, ev, nv)
Compares an atomic variable of name given by string str, with a value ev. If the comparison holds true, the variable will be set to the third parameter value, nv. nv can be a string or a number (or nil). cmpsetatom returns a boolean denoting whether or not the comparison held true.
