goroutine 기본 구조

1. 기본구조

수행시 go 키워드를 붙여서 실행시키면 동시에 실행됨.

package main

import (

"fmt"

"time"

)

func t1() {

time.Sleep(time.Second * 2)

fmt.Println("t1 func...")

}

func main() {

go t1()

fmt.Println("this is main func...")

time.Sleep(time.Second * 3)

}

2. 테스트 예제

package main

import (

"fmt"

"net/http"

"os"

"time"

)

func responseTime(url string) {

start := time.Now()

res, err := http.Get(url)

if err != nil {

fmt.Println(err)

os.Exit(1)

}

defer res.Body.Close()

elapsed := time.Since(start).Seconds()

fmt.Printf("%s took %v seconds \n", url, elapsed)

}

func main() {

urls := make([]string, 3)

urls[0] = "https://www.naver.com/"

urls[1] = "https://www.google.com/"

urls[2] = "https://www.apple.com/"

for _, u := range urls {

go responseTime(u)

}

time.Sleep(time.Second * 5)

}