I saw the example
<https://godoc.org/golang.org/x/sync/errgroup#example-Group--Parallel> of
errgroup in godoc, and it makes me confused that it simply assigns the
result to global results instead of using channels in each search routines.
Heres the code:
Google := func(ctx context.Context, query string) ([]Result, error) {
g, ctx := errgroup.WithContext(ctx)
searches := []Search{Web, Image, Video}
results := make([]Result, len(searches))
for i, search := range searches {
i, search := i, search //
https://golang.org/doc/faq#closures_and_goroutines
g.Go(func() error {
result, err := search(ctx, query)
if err == nil {
results[i] = result
}
return err
})
}
if err := g.Wait(); err != nil {
return nil, err
}
return results, nil
}
I'm wondering is there any mechanism or implied rules that makes the *write
*in sub goroutines a happens before of *read *in main goroutine? Thanks for
your time.
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