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v2.0.4 — Unified DCL snapshot pattern

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@OldCrow OldCrow released this 05 Jul 05:45
v2.0.4
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OldCrow Gary Wolfman
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Learn about vigilant mode.
74c63ee
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Learn about vigilant mode.

What's changed

Refactoring

Extracted the double-checked locking + cache snapshot protocol used in every distribution into a single ThreadSafeCacheManager::withCacheSnapshot(SnapshotFn&&) helper (include/core/distribution_cache.h).

All Pattern A (scalar methods) and Pattern B (batch lambda) DCL blocks across 17 distribution source files are replaced with the unified helper — approximately 200 occurrences eliminated with no API or behavioural change.

No public API changes. Existing code compiles and runs identically.

Validation (M1 NEON + CI)

  • 69/69 tests pass (46 correctness + 22 timing + 1 benchmark)
  • toctou_validator: 0 violations across all 19 distributions (10.6M concurrent reads)
  • simd_verification: NEON speedups intact (PDF 6.5x, LogPDF 8.4x, CDF 3.2x)
  • parallel_correctness_verification: 100% deterministic, 100% thread-safe
  • CI green on macOS (AppleClang/NEON), Linux (GCC/AVX2), Windows (MSVC/AVX-512)

Files changed

  • include/core/distribution_cache.h — added withCacheSnapshot helper
  • 17 distribution source files converted: beta, binomial, cauchy, discrete, exponential, gamma, gaussian, laplace, lognormal, negative_binomial, pareto, poisson, rayleigh, student_t, uniform, von_mises, weibull

Full changelog: https://github.com/OldCrow/libstats/blob/main/CHANGELOG.md

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