Revision history for Data-ReqRep-Shared

0.05  2026-07-03
    - Security and robustness hardening; backing files now created mode
      0600 (pass a file-mode argument to new() for cross-user sharing).

0.04  2026-05-27
    - slot_acquire: owner_pid CAS gates the state CAS, ACQUIRE on loads
      (fixes recovery ABA where a fresh free+acquire could clobber a live owner)
    - reply: re-check generation before publishing CAS and recover post-CAS
      via gen bump (fixes TOCTOU where cancel+re-acquire could let a reply
      land on the wrong owner's slot)
    - slot_release: two-step CAS (owner_pid mypid→0, then state from→FREE)
      prevents blind state-store from clobbering a freshly-acquired slot
    - compute_layout: resp_stride in uint64 (was wrapping for resp_data_max
      near UINT32_MAX → replies overflowing into next slot)
    - validate_header: reject files with resp_stride too small for slot data
    - size(): read head before tail and clamp tail<head to 0
    - plug mmap/fd leak in create_int / create_int_memfd on calloc OOM


0.03  2026-04-26
    - arena underflow guard; init under flock
    - strict fd validation; harden DESTROY
    - hoist SV construction out of recv multi/drain mutex
    - class prefix on client croaks
    - eventfd consume returns count; MAKE OBJ macro fix
    - idempotent eventfd; aarch64 CI matrix


0.02  2026-04-12
    - Add SEE ALSO cross-links to family modules

0.01  2026-04-10
    - Initial release
    - Str variant: mutex-protected request queue with circular arena
    - Int variant: lock-free Vyukov MPMC request queue
    - Per-slot futex for targeted response delivery
    - Generation counter for ABA-safe cancel/recycle
    - PID-based stale lock and slot recovery
    - Dual eventfd for async EV integration
    - File-backed, anonymous, and memfd shared memory
