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

Posix defines a number of functions as acting as memory barriers. Memory locations must not be concurrently accessed; to prevent this, use synchronization - and that synchronization will also work as a barrier.

Answer 2

The Qprof profiling library (nothing to do with Qt) also includes in its source code a library of atomic operations, including memory barriers. They work on many compilers and architectures. I'm using it on a project of mine.

http://www.hpl.hp.com/research/linux/qprof/download.php4