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Go subtleties

(harrisoncramer.me)
234 points darccio | 3 comments | 13 Oct 25 07:42 UTC | HN request time: 0s | source
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acatton ◴[22 Oct 25 12:18 UTC] No.45667905[source]▶
> The wg.Go Function

> Go 1.25 introduced a waitgroup.Go function that lets you add Go routines to a waitgroup more easily. It takes the place of using the go keyword, [...]

99% of the time, you don't want to use sync.WaitGroup, but rather errgroup.Group. This is basically sync.WaitGroup with error handling. It also has optional context/cancellation support. See https://pkg.go.dev/golang.org/x/sync/errgroup

I know it's not part of the standard library, but it's part of the http://golang.org/x/ packages. TBH, golang.org/x/ is stuff that should be in the standard library but isn't, for some reason.

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1. infogulch ◴[22 Oct 25 17:52 UTC] No.45672717[source]▶
Wow how did I not know of this?!

How does it cancel in-progress goroutines when the provided context is cancelled?

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2. wesleyd ◴[22 Oct 25 18:09 UTC] No.45672963[source]▶
They have to all use the special context.
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3. lowmagnet ◴[22 Oct 25 23:00 UTC] No.45676231[source]▶
They just need to be context aware, or call context-aware things.