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sample-golang
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01_hello
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add sample
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be7f3f99c920b072aba030843a291d65de8c74f6
yhornisse
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on 9 Oct 2021
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goroutine/README.md
goroutine/parallel.go
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goroutine/README.md
## MEMO - 最初に呼び出されるgoroutineはmain goroutine - `make(chan string)` でバッファなし、 `make(chan string, 10)`のように書けばバッファあり バッファがいっぱい場合は受信されて空きができるまで待たされる。
## MEMO - 最初に呼び出されるgoroutineはmain goroutine
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goroutine/parallel.go
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package main import ( "fmt" ) func main() { ng() // 2, 2, 2 ok() // 0, 1, 2 } func ng() { ary := [3]int{1, 2, 3} done := make(chan bool) for i := range ary { go func() { fmt.Println(i) // NG done <- true }() } for i := 0; i < 3; i++ { <- done } } func ok() { ary := [3]int{1, 2, 3} done := make(chan bool) for i := range ary { go func(i int) { fmt.Println(i) done <- true }(i) } for i := 0; i < 3; i++ { <- done } }
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GitBucket
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GitBucket
4.23.0