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compare_and_swap

concur.atomic.compare_and_swap

(expected T, new_value T)
 => 
T
Perform a bit-wise comparison of the value contained in this atomic and
`expected`. In case both values are equal, replace this value with `new_value`.

returns the old value, independent of whether the old value is bit-wise
equal to `expected` or not.
0.095dev (2025-10-09 18:01:25 GIT hash 4826e516431c193e428991dd546a46472973d8d4 built by fridi@fzen)