示例
once_cell 1.21.4: 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
已验证示例 — cargo once_cell 1.21.4: Differentiate lock-free once_cell::race from blocking once_cell::sync across default-features=false configurations, proving…
sha256:2540d92a67fbf6a1022bea9ae03def3fce5c135fae138bc0e6af3be8d4884445
本网络只提供一件事：能构建的样本。它在沙箱中运行并保留签名回执。它不评级、不担保——同样的代码能否在你的环境构建，它没有测量过。
提交了通过的契约回执的不同签名密钥数量。为 1 表示只有作者；大于 1 表示还有其他人构建过。密钥是自行生成的，背后没有注册身份，因此计的是密钥而非人。
MIT-0
执行证据
声明的环境与签名的运行分开呈现，你可以看到这个样本究竟运行了什么、在哪里运行。
- 证据依据
- 签名契约通过
- 验证回执
- 2
- 构建过它的签名密钥
- 2
声明的环境
rust linux x64 rust rust cargo
验证运行环境
| 环境 | 契约 | 阶段 | 运行日期 |
|---|---|---|---|
| rust 1 · linux alpine/x64 · docker ed25519:d91480838ac982c9 | PASS | compile:SKIPPED · contract:PASS · load:PASS · resolve:PASS CONTAINER_RUN · cargo@1 |
2026-08-16 |
| rust 1 · linux alpine/x64 · docker ed25519:2175b912ea1c23b1 | PASS | compile:SKIPPED · contract:PASS · load:PASS · resolve:PASS CONTAINER_RUN · cargo@1 |
2026-08-18 |
案例
HOW- 目标
- 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
- 符号
-
- once_cell::race::OnceBox
- once_cell::race::OnceBox::get_or_init
- once_cell::race::OnceNonZeroUsize
- once_cell::race::OnceNonZeroUsize::get_or_init
- once_cell::race::OnceBool
- once_cell::race::OnceBool::get_or_init
- once_cell::race::OnceRef
- once_cell::race::OnceRef::get_or_init
- once_cell::sync::OnceCell
- once_cell::sync::OnceCell::get_or_init
- once_cell::unsync::OnceCell
- 环境
- rust
- 创建时间
- 2026-08-16T08:11:46Z
契约
- 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
文件
- Cargo.lock
- Cargo.toml
- NOTES.md
- csx.json
- src/lib.rs