Go語言協程和無緩沖通道使用

示例代碼：

package main

import (
	"fmt"
	"time"
)

func hello(channel_hello chan string) {
	fmt.Println("hello.")
	//確定hello列印輸出
	time.Sleep(1*time.Second)
	//發送資料到通道
	channel_hello <- "hello_channel"
	//關閉通道，通知接受者此通道不會再發送資料
	close(channel_hello)
}

func main()  {
	//建立無緩沖通道channel，用于goroutine之間通信
	channel_hello := make(chan string)
	//建立協程goroutine
	go hello(channel_hello)
	status_flag := true
	for status_flag {
		select {
		case chan_receive,chan_status := <- channel_hello:
			if chan_status {
				//從通道接收資料
				fmt.Println("msg receive from channel success:", chan_receive)
			} else {
				//通道被關閉
				status_flag = false
				fmt.Println("chan close success", chan_status)
			}
		default:
		}
	}
	fmt.Println("main end.")
}