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Systems¶

What this chapter defines — an index of cross-cutting Core internal structure documents that do not belong to one specific contract document.

This document links Core internal-structure documents that span multiple socket types and common contracts. Most of what each document describes is implementation detail, and the public contract supported by that content is owned by the related specification document to which it links. As an exception, 06. Auto HWM owns the Auto HWM budget contract together with its internal implementation.

Document	Content
01. Core runtime architecture	Internal components and boundaries from the public API to the I/O thread
02. Core threading model	Thread types and responsibilities
03. I/O Thread	How I/O threads are created and how work is distributed
04. Thread Safety	Implementation of the three-tier thread-safety contract
05. Connection Memory	Memory components for each connection
06. Auto HWM	Auto HWM budget contract and internal structure
07. Core Source Layout	Source directory layout and include direction
08. Core POSD Module Structure	Responsibility separation across layers
09. Core Design Decisions	Key design decisions
10. Core Hot Path	Scope of the per-message path, forbidden operations, state caches, performance gates
11. Synchronization Model	Ownership units (socket turn, pipe ends, mailbox), when a lock is allowed and forbidden forms, lock inventory

Core Spec Index | Previous: RAW (STREAM) Protocol Details | Next: Architecture