非緩衝Unbuffered Channels VS 緩衝buffered Channels

下圖清楚解釋非緩衝Unbuffered Channels 和 緩衝buffered Channels差別，

• Unbuffered Channels

• buffered Channels

非緩衝Unbuffered Channels

兩個Goroutine一次只能交換一筆資料，交換的同時過程鎖定，直到交換結束。

緩衝buffered Channels

channel增加具有容量，兩個 Goroutine可同時接收與發送資料。

Golang buffered Channels

buffered Channel宣告方式如下，和Channel方式一樣，但增加了緩衝值：

c := make(chan 資料型別,num)//num緩衝值

程式範例：

package main

import "fmt"

func main() {

	messages := make(chan string, 2)

	messages <- "A"
	messages <- "B"
	fmt.Println(<-messages)
	fmt.Println(<-messages)
}

輸出結果：

A
B

參考資料

1. https://gobyexample.com/channel-buffering
2. https://hoohoo.top/blog/golang-channels/
3. https://www.ardanlabs.com/blog/2014/02/the-nature-of-channels-in-go.html