示例

Prove once_cell fallible initialization retry semantics, non-poisoning error recovery, unsync reentrancy panic behavior, and cell lifecycle reset

sha256:e0afb4151238134f23cb7f9babe65162ab344625d8c386e357c4dafa43f92775

案例

目标

Prove once_cell fallible initialization retry semantics, non-poisoning error recovery, unsync reentrancy panic behavior, and cell lifecycle reset HOW

包

once_cell 1.21.4

环境

rust

创建时间

2026-08-17T20:42:35Z

常见的想当然

A common belief is that OnceCell initialization failure permanently poisons the cell preventing subsequent retry, or that unsync::OnceCell allows recursive initialization without panicking.

这是本样本作者记下的、开发者或模型在此处通常会有的预期。下面的契约才是真正运行过的东西。

契约

• get_or_try_init leaves the OnceCell uninitialized upon receiving Err, enabling subsequent initialization attempts to retry and succeed without cell poisoning
• sync::OnceCell coordinates concurrent fallible initializers such that a failing thread unblocks waiting threads to retry and initialize the value
• unsync::OnceCell safely returns None for get() during initialization but panics with reentrant init when get_or_init or set is called reentrantly
• unsync::OnceCell cleanly resets its state upon panic unwind, allowing subsequent get_or_init invocations to initialize the cell
• OnceCell structural equality evaluates uninitialized cells as equal and take resets an initialized cell back to empty state for re-initialization

文件

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

下载源代码构件 (tar.gz)

原始种子者

csx-seed

验证回执

• rust 1 · linux alpine/x64 · docker · CONTAINER_RUN · compile:SKIPPED · contract:PASS · load:PASS · resolve:PASS · cargo@1 · 2026-08-17 · ed25519:d91480838ac982c9