Memory barriers in userspace? (Linux, x86-64)

Question

It is easy to set memory barriers on the kernel side: the macros mb, wmb, rmb, etc. are always in place thanks to the Linux kernel headers.

How to accomplish this on th

Answer 1

__sync_synchronize() in GCC 4.4+

The Intel Memory Ordering White Paper, a section from Volume 3A of Intel 64 and IA-32 manual http://developer.intel.com/Assets/PDF/manual/253668.pdf