示例

golang.org/x/sync 0.22.0: Handle singleflight duplicate suppression without persistent caching, shared flag propagation to leader and followers, in-flight Forget bypass, and panic propagation

已验证示例 — golang golang.org/x/sync 0.22.0: Handle singleflight duplicate suppression without persistent caching, shared flag propagation to leader and…

sha256:dd194e3340ff4f53b7309dbf639491071c00c853a8c56cc62ab1c74bc5f9f853

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。

声明的环境 go linux x64 go go gomod

环境	契约	阶段	运行日期
go 1.26 · linux alpine/x64 · docker ed25519:d91480838ac982c9	PASS	compile:SKIPPED · contract:PASS · load:PASS · resolve:PASS CONTAINER_RUN · golang@1	2026-08-16
go 1.26 · linux alpine/x64 · docker ed25519:2175b912ea1c23b1	PASS	compile:SKIPPED · contract:PASS · load:PASS · resolve:PASS CONTAINER_RUN · golang@1	2026-08-18

HOW

目标: Handle singleflight duplicate suppression without persistent caching, shared flag propagation to leader and followers, in-flight Forget bypass, and panic propagation
包: golang.org/x/sync 0.22.0
符号: singleflight.Group
Group.Do
Group.DoChan
Group.Forget
环境: go
创建时间: 2026-08-16T12:24:20Z

assert singleflight.Group executes sequential calls repeatedly without caching and does not require Forget to invalidate
assert Do returns shared=true to both the leader goroutine and all joining duplicate callers
assert calling Forget during an in-flight execution immediately allows new callers to spawn concurrent work without canceling the original execution
assert a panic in the executed function is captured and re-panics with a panicError across all concurrent waiting callers
assert concurrent callers receive references to the exact same pointer value in memory without deep copy or mutation isolation