goroutine 并发效果验证_go 查看并发是否生效-优快云博客

本文链接：https://blog.youkuaiyun.com/weixin_44648216/article/details/119522087

本文探讨了Go语言中如何通过`main`和子goroutine的交互来实现任务交错执行。重点在于理解主goroutine如何影响子goroutine的执行，以及不设置sleep时的行为对比。

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package main
 
import (
    "fmt"
    "time"
)
 
//子goroutine
func newTask() {
	for i := 0; i<3; i++ {
        fmt.Printf("new Goroutine : i = %d\n", i)
        time.Sleep(1 * time.Second)
    }
}
 
//主goroutine
func main() {
    //创建一个go协程去执行newTask() 
    go newTask() 
    for  i := 0; i<3; i++ {
        fmt.Printf("main goroutine: i = %d\n", i)
        time.Sleep(1 * time.Second)
    }
    
}

输出结果：

main goroutine: i = 0
new Goroutine : i = 0
main goroutine: i = 1
new Goroutine : i = 1
main goroutine: i = 2
new Goroutine : i = 2
或者
main goroutine: i = 0
new Goroutine : i = 0
new Goroutine : i = 1
main goroutine: i = 1
new Goroutine : i = 2
main goroutine: i = 2
等随机交替效果。

如果主goroutine这里不sleep的话，子goroutine就没机会执行。

package main
 
import (
    "fmt"
    "time"
)
 
//子goroutine
func newTask() {
	for i := 0; i<3; i++ {
        fmt.Printf("new Goroutine : i = %d\n", i)
        time.Sleep(1 * time.Second)
    }
}
 
//主goroutine
func main() {
    //创建一个go协程去执行newTask() 
    go newTask() 
    for  i := 0; i<3; i++ {
        fmt.Printf("main goroutine: i = %d\n", i)
        //time.Sleep(1 * time.Second)
    }
    
}