And yet people did threaded programming in C before C11. Granted, you cannot do it in plain C99 -- in practice extensions were used. The hard part wasn't gett

And yet people did threaded programming in C before C11. Granted, you cannot do it in plain C99 -- in practice extensions were used. The hard part wasn't getting the fence instructions (asm will do it) but getting the compiler to not re-order things around fences, and `asm volatile ("" ::: "memory")` (or similar) would do that.