Changelog

All notable changes to this project will be documented in this file.

The format is based on Keep a Changelog, and this project aims to follow Semantic Versioning.

[Unreleased]

spscring as a third-party submodule for the shared-memory SPSC ring, wait/notify, and layout ABI.
shm_channel producer and consumer wrappers over the shared-memory transport.
C API xproc_c_message_meta plus send/peek helpers that accept or return per-message metadata.
Timed reserve_for on ring writers, with send_*_for delegating to that path.

In-tree include/xproc/ringbuffer and include/xproc/sync implementations are replaced by spscring.
Poll/peek callbacks and send APIs take message_meta. Variable-length slots carry it on the wire; fixed-size slots remain payload-only, so send_fixed_*_with_meta / xproc_c_producer_send_fixed_sized_with_meta keep the argument for compatibility and readers still see default (zero) metadata.
Optional JSON and Protobuf codec integrations and related CMake options are removed.

Linux atomic_wait / atomic_notify now use process-shared FUTEX_WAIT / FUTEX_WAKE, so cross-process shared-memory waiters wake instead of blocking indefinitely.
Windows CI generator and CMake policy settings for Visual Studio 2022 / 2026.

Shared-library build option (XPROC_BUILD_SHARED) and install updates.
pkg-config generation/install support (xproc.pc).
Docker-based CI workflow.
Benchmark target split with xproc_run_benchmarks.
Sphinx-compatible RST documentation under docs/.
Project support files (SECURITY.md, CONTRIBUTING.md, CODEOWNERS).
Initial capi/ C API wrapper with opaque handles, byte-copy send/receive APIs, structured layout errors, option validation, and smoke tests.

Benchmark layout and execution model for better suite-level control.
Transport validation now enforces socket connect-mode port requirements, retry bounds, and role-specific producer / consumer / observer expectations more explicitly.
Socket transport now resolves IPv4 / IPv6 peers via getaddrinfo(AF_UNSPEC) and prefers a dual-stack IPv6 listener with IPv4 fallback.

Benchmark crash paths related to invalid benchmark argument usage and ringbuffer benchmark stability.