On 26/02/2015 08:27, Axel Dörfler wrote: > Am 26/02/2015 um 05:00 schrieb kallisti5: >> It looks like after Paweł's C++11 work, we don't need the atomic >> syscalls anymore? > > There are architectures that need syscalls to implement the atomic > functions properly. Those are the only ones that should use them. On ARM currently some variants still need syscalls for the 64bit atomics. I'm not sure which though, likely the asm implementations are inside some #ifdef ? François.