浅析Go语言中的同步与异步处理

package main

import (
	"fmt"
	"net/http"
)

func makeUrlCall(url string) {
	_, err := http.Get(url)
	if err != nil {
		fmt.Println("Got error in connecting to url: ", url)
	}

	fmt.Println("Got the response from our url: ", url)
}

func main() {

	fmt.Println("Welcome here !!")
	fmt.Println()

	//slice of urls
	urlSlice := []string{
		"https://www.baidu.com",
		"https://www.csdn.net",
		"https://www.runoob.com",
	}

	for idx, url := range urlSlice {
		fmt.Println("Calling url on index: ", idx)
		makeUrlCall(url)
	}

	fmt.Println()
	fmt.Println("End of sync processing !!")

	return
}

package main

import (
	"fmt"
	"net/http"
	"sync"
)

func makeUrlCall(url string) {
	_, err := http.Get(url)
	if err != nil {
		fmt.Println("Got error in connecting to url: ", url)
	}

	fmt.Println("Got the response from our url: ", url)
}

func main() {
	fmt.Println("Welcome here !!")
	fmt.Println()

	//slice of urls
	urlSlice := []string{
		"https://www.baidu.com",
		"https://www.csdn.net",
		"https://www.runoob.com",
	}

	var wg sync.WaitGroup

	for _, u := range urlSlice {
		wg.Add(1)
		//all the url's to get error/response are called in their own separate thread via goroutines
		go func(url string) {
			defer wg.Done()

			makeUrlCall(url)
		}(u)
	}

	wg.Wait()

	fmt.Println()
	fmt.Println("End of sync processing !!")

	return
}