I need to increment a uint by a calculated amount "inc" between 0 and UINT_MAX. These calculations occur in parallel, and several threads may acess the same value.
I can do this with atom_add(pmap, inc), but there is a distinct possiblity that the value may wrap.
Is there an efficient way to prevent the roll over by clamping the value?
Currently I increment the value, then retrieve the value and test that it is > inc.
This would be simple if atom_add() return the new value, but atom_add returns the "old" value.
As it is, this two step process is not guaranteed to be correct.
Is there a simple way to do what I need?