Go - Concurrency(my sleep function, time package, After function, Duration, channel, select/case, blocking)

Introducing Go

開発環境

• macOS High Sierra - Apple (OS)
• Emacs (Text Editor)
• Go (プログラミング言語)

Introducing Go: Build Reliable, Scalable Programs (Caleb Doxsey (著)、O'Reilly Media)のChapter 10.(Concurrency)、Exercises(No. 1879)2.を取り組んでみる。

コード(Emacs)

package main

import (
 "fmt"
 "time"
)

func Sleep(d time.Duration) {
 select {
 case <-time.After(d):
 }
}

func main() {
 xs := []time.Duration{1, 5, 10}
 for _, x := range xs {
  fmt.Println(time.Now().Second())
  Sleep(time.Second * x)
  fmt.Println(time.Now().Second())
  fmt.Println()
 }
}

入出力結果(Terminal)

$ go run sample2.go
5
6

6
11

11
21

$