Memory ordering

[inspirit]

can we relax compare_exchange_weak with different memory orders?

I would assume that for push operation we can do memory_order_release and memory_order_relaxed

and for pop: memory_order_release and memory_order_acquire

any thought on that?

[skeeto]

I don't understand C11 memory ordering well enough to say what other
memory orderings are correct, and that part of the C11 spec is too dense
for me to follow. And since it doesn't make any difference on x86 --
where a locked cmpxchg is always going to be a full memory barrier -- I
couldn't really test it either.

[inspirit]

yeah memory order might make sense if 64bit head used instead of 128bits