Module memory 

Memory classes, placement policy, and token-backed message storage.

Edges carry MessageToken handles rather than full messages. All message data lives in a MemoryManager, keyed by token. This module provides:

• MemoryClass — tag describing where a payload resides (host, pinned, device, shared).
• PlacementAcceptance / PlacementDecision — zero-copy routing policy.
• BufferDescriptor — lightweight byte-size descriptor returned by Payload.

Submodules:

• header_store — HeaderStore supertrait for payload-agnostic header access.
• manager — MemoryManager typed storage interface.
• static_manager — no_std/no_alloc fixed-capacity implementation.
• heap_manager (alloc) — heap-backed fixed-capacity implementation.
• concurrent_manager (std) — lock-free freelist + per-slot RwLock implementation.

Modules

concurrent_manager

Concurrent heap-backed memory manager with lock-free freelist.

header_store

Read-only header access for token-backed message storage.

heap_manager

Heap-backed fixed-capacity memory manager.

manager

Typed token-backed message storage.

static_manager

Fixed-capacity, no_std, no_alloc memory manager.

Structs

BufferDescriptor

A descriptor of a buffer/payload view for size accounting.

PlacementAcceptance

A bitfield describing which memory classes a port can accept zero-copy.

Enums

MemoryClass

The memory class associated with a payload.

PlacementDecision

The edge-level placement decision for a message about to cross a port.

Functions

decide_placement

Decide whether an edge can pass a message zero-copy or requires adaptation.