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I know that on MacOSX / PosiX systems, there is atomic-compare-and-swap for C/C++ code via g++.
However, I don’t need the compare — I just want to atomically swap two values. Is there an atomic swap operation available? [Everythign I can find is atomic_compare_and_swap … and I just want to do the swap, without comparing].
Thanks!
the “lock xchg” intel assembly instruction probably achieves what you want but i dont think there is a GCC wrapper function to make it portable. Therefor your stuck using inline assembly(not portable) or using compare and swap and forcing the compare to be true(inneficient). Hope this helps 🙂