18.goroutine

package main
import (
    "fmt"
    "time"
)
//从goroutine
func newTask()  {
    i:=0
    for  {
        i++
        fmt.Printf("task %d\n",i)
        time.Sleep(1 * time.Second)
    }
}
//主goroutine
func main() {
    //创建一个go线程，去执行newTask()
    go newTask()
    i:=0
    for  {
        i++
        fmt.Printf("main %d\n",i)
        time.Sleep(1 * time.Second)
    }
}

package main
import (
    "fmt"
    "time"
)
//从goroutine
func newTask()  {
    i:=0
    for  {
        i++
        fmt.Printf("task %d\n",i)
        time.Sleep(1 * time.Second)
    }
}
//主goroutine
func main() {
    //创建一个go线程，去执行newTask()
    go newTask()
    fmt.Println("main exit")
}

package main
import (
    "fmt"
    "time"
)
func main() {
    //go创建一个形参为空，返回值为空的一个函数
    go func() {
        defer fmt.Println("defer")
        func(){
            defer fmt.Println("inner defer")
            fmt.Println("B")
        }()
        fmt.Println("A")
    }()
    //死循环
    for  {
        time.Sleep(1 * time.Second)
    }
}

package main
import (
    "fmt"
    "runtime"
    "time"
)
func main() {
    //go创建一个形参为空，返回值为空的一个函数
    go func() {
        defer fmt.Println("defer")
        func(){
            defer fmt.Println("inner defer")
            //退出当前goroutine
            runtime.Goexit()
            fmt.Println("B")
        }()
        fmt.Println("A")
    }()
    //死循环
    for  {
        time.Sleep(1 * time.Second)
    }
}

package main
import (
    "fmt"
    "time"
)
func main() {
    //goroutine
    go func(a int,b int) bool {
        fmt.Println(a,b)
        return true
    }(10,20)
    //死循环
    for  {
        time.Sleep(1 * time.Second)
    }
}