1 Nov
2011
1 Nov
'11
6:29 a.m.
might be possible, the problem is that this assumes that there is atomic<something> available -- as soon as you hit a platform where everything hits the fallback, you just have to use a mutex and the cost becomes unbearable
True. But are there realistic platforms without any support of atomic ops whatsoever today? If there are, I'm not sure the library should support these platforms in the first place.
there is PA-RISC which only supports LDCW which must be cacheline-aligned -- as a result, each atomic value would have the size of one cacheline (whether PA-RISC should be supported is another question)