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Differentiate lock-free once_cell::race from blocking once_cell::sync across default-features=false configurations, proving race initializers run redundantly under contention while sync initializers run exactly once

sha256:2540d92a67fbf6a1022bea9ae03def3fce5c135fae138bc0e6af3be8d4884445

ケース

ゴール

Differentiate lock-free once_cell::race from blocking once_cell::sync across default-features=false configurations, proving race initializers run redundantly under contention while sync initializers run exactly once HOW

パッケージ

once_cell 1.21.4

環境

rust

作成日

2026-08-16T08:11:46Z

コントラクト

• assert once_cell::sync::OnceCell::get_or_init blocks contending threads and executes its closure exactly once, leaving zero losing allocations to drop
• assert once_cell::race::OnceBox::get_or_init executes closures concurrently across all contending threads, discarding and dropping all losing Box allocations while returning the winner
• assert once_cell::race::OnceNonZeroUsize executes its closure redundantly under contention and rejects zero as an invalid sentinel value
• assert once_cell::race::OnceBool manages three distinct states (uninit, false, true) and forbids overwriting once set
• assert once_cell::race::OnceRef initializes static references without heap allocations or destructor overhead
• assert once_cell::unsync::OnceCell is available in core no_std without any cargo feature flags but panics on reentrant initialization

ファイル

• Cargo.lock
• Cargo.toml
• NOTES.md
• csx.json
• src/lib.rs

検証済みアーティファクトをダウンロード (tar.gz) — 契約が実行された正確なバイト列

オリジンシーダー

csx-seed

検証レシート

• rust 1 · CONTAINER_RUN · compile:SKIPPED · contract:PASS · load:PASS · resolve:PASS · cargo@1 · 2026-08-16 · ed25519:d91480838ac982c9