Insufficient memory reordering protection in spsc::Queue::push and spsc::Queue::pop

[elBoberido]

Required information

Operating system:
all

Rust version:
all

Cargo version:
all

iceoryx2 version:
main branch

Observed result or behaviour:

The data access is not sufficiently protected against a reordering with read_position. While there is a AqcRel fence, the fence has no counterpart to synchronize with. This can be fixed by replacing the fence with a store on read_position with Ordering::Release in pop and a load with Ordering::Acquire in push.

Expected result or behaviour:

The data array is protected against reordering.

Conditions where it occurred / Performed steps:

It can happen whenever the CPU reorders the instructions.