Wrong memory order in fence synchronization in 'UniqueIndexSet'

[elBoberido]

Required information

Operating system:
all

Rust version:
all

Cargo version:
all

iceoryx2 version:
main branch

Observed result or behaviour:

The UniqueIndexSet uses fences to synchronize next_free_index. The memory order of the fences is wrong and needs to be changed. It needs to be Ordering::Release in acquire_raw_index and Ordering::Acquire in release_raw_index.

Expected result or behaviour:

Proper ordering for the fences.

Conditions where it occurred / Performed steps:

If the index is send to another thread via a relaxed atomic operation, a reordering can happen.