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sync/waitgroup: why `v == int32(delta)` is required when judging if the waitgroup is misused? #39571

cncal opened this issue Jun 13, 2020 · 1 comment


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@cncal cncal commented Jun 13, 2020

What version of Go are you using (go version)?

$ go version
go version go1.14.2 darwin/amd64


Why v == int32(delta) is required here? Is w != 0 && delta > 0 insufficient to judge if a waitgroup is misused for Add called concurrently with Wait?

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@davecheney davecheney commented Jun 13, 2020

Because delta is declared in the function declaration as int. There are no few implicit conversion rules in Go, so int and int32 are not the same type, even if the program is compiled on a 32 bit platform.

Unlike many projects on GitHub, the Go project does not use its bug tracker for general discussion or asking questions. We only use our bug tracker for tracking bugs and tracking proposals going through the Proposal Process.

Please see for good places to ask questions.

@davecheney davecheney closed this Jun 13, 2020
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