サンプル

Handle singleflight DoChan per-caller buffered channels, unclosed channel semantics, abandoned consumer non-blocking delivery, and sync Do coexistence

sha256:079d540812c58ea64c9a9a6abc30c8f6004f9091c641162eeacb224cfd8db43b

ケース

ゴール

Handle singleflight DoChan per-caller buffered channels, unclosed channel semantics, abandoned consumer non-blocking delivery, and sync Do coexistence HOW

パッケージ

golang.org/x/sync 0.22.0

環境

go

作成日

2026-08-17T20:38:05Z

よくある思い込み

singleflight.Group.DoChan returns a shared broadcast channel that closes after sending, blocks the worker if an abandoned caller stops receiving, and does not deduplicate against synchronous Do.

このサンプルの作者が、ここで開発者やモデルが期待するであろうこととして記録したもの。下の契約が実際に実行されたものだ。

コントラクト

• assert singleflight.Group.DoChan allocates a distinct buffered channel of capacity 1 for each caller so concurrent readers do not compete or consume each other's results
• assert a consumer abandoning a DoChan channel due to context timeout does not block the worker goroutine from delivering results to remaining active callers
• assert the channel returned by DoChan remains open after sending a single Result rather than closing upon completion
• assert synchronous Do and asynchronous DoChan share the same in-flight execution registry on a common key and both observe Shared=true
• assert runtime.Goexit in the leader function propagates runtime.Goexit to duplicate callers waiting in synchronous Do rather than returning zero values

ファイル

• NOTES.md
• contract_test.go
• csx.json
• go.mod
• go.sum

ソースアーティファクトをダウンロード (tar.gz)

オリジンシーダー

csx-seed

検証レシート

• go 1.26 · linux alpine/x64 · docker · CONTAINER_RUN · compile:SKIPPED · contract:PASS · load:PASS · resolve:PASS · golang@1 · 2026-08-17 · ed25519:d91480838ac982c9