Joseph Garvin <joseph.h.garvin@xxxxxxxxx> writes: > The release notes for 4.2 [1] mention some atomic builtins I haven't > seen documented anywhere, __atomic_add, and __exchange_and_add. I > assume these are distinct from the __sync builtins. Are they > documented somewhere? If not what other undocumented builtins are > there? __atomic_add and __exchange_and_add are not builtins. They are functions provided by the libstdc++ runtime library. The are documented at http://gcc.gnu.org/onlinedocs/libstdc++/manual/ext_concurrency.html . Ian
