> The problem is that when we discussed this patch on ODP call people very > worry about having 128bit instructions in ODP examples. At least Petri > and Barry asked if it would be possible to rewrite that with 64 bit > instructions? Some compilers might not support 128 bits and we need to > test it more.
On 32-bit platforms, it already does use 64-bit atomics. In general, though, the example hinges around having atomics that are twice the pointer size. We've actually discussed this on the list already in the thread "32-bit support in examples". Even if lock-free implementations can't be used, compilers can (and frequently do?) provide a lock-based compare exchange operation.
