On Mon, 2014-02-17 at 18:59 +0000, Joseph S. Myers wrote: > On Sat, 15 Feb 2014, Torvald Riegel wrote: > > > glibc is a counterexample that comes to mind, although it's a smaller > > code base. (It's currently not using C11 atomics, but transitioning > > there makes sense, and some thing I want to get to eventually.) > > glibc is using C11 atomics (GCC builtins rather than _Atomic / > <stdatomic.h>, but using __atomic_* with explicitly specified memory model > rather than the older __sync_*) on AArch64, plus in certain cases on ARM > and MIPS.
I think the major steps remaining is moving the other architectures over, and rechecking concurrent code (e.g., for the code that I have seen, it was either asm variants (eg, on x86), or built before C11; ARM pthread_once was lacking memory_barriers (see "pthread_once unification" patches I posted)). We also need/should to move towards using relaxed-MO atomic loads instead of plain loads.
