By bespoke you mean using standard interfaces to create shared memory pools? They do roll some of their own locking primitives, but that's not particularly unu

By bespoke you mean using standard interfaces to create shared memory pools? They do roll some of their own locking primitives, but that's not particularly unusual in a large portable program (and quite likely what they wanted is/was not available in glibc or other standard libraries, at least when first written).