ta_shuo

Go by Example - Goroutines

翻译自 https://gobyexample.com/

Go by Example

Go is an open source programming language designed for building simple, fast, and reliable software.

Go by Example is a hands-on introduction to Go using annotated example programs. Check out the first example or browse the full list below.

Go by Example: Goroutines

golang中的goroutine是一个比线程还要轻量的调度单位。

1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
package main
import "fmt"
func f(form string) {
for i := 0; i < 3; i++ {
fmt.Println(from, ":", i)
}
}
func main() {
// 常用的函数调用方式,同步执行
f("direct")
// 使用go关键字来启动goroutine执行函数,跟正在执行的函数调用并行执行
go f("goroutine")
// 也可以启动goroutine执行匿名函数
go func(msg string) {
fmt.Println(msg)
}("going")
// 上面两个go启动的函数调用在独立的goroutine中异步执行
// 下面Scanln函数在接收到外界一个输入时结束程序
var input string
fmt.Scanln(&input)
fmt.Println("done")
}
1
2
3
4
5
6
7
8
9
10
11
// 从输出的结果,匿名函数的输出插入在第一个goroutine的输出中,可看出两个函数调用是在独立的goroutine中并行执行
$ go run goroutines.go
direct : 0
direct : 1
direct : 2
goroutine : 0
going
goroutine : 1
goroutine : 2
<enter>
done

原文链接:Go by Example: Goroutines