标签：golang goroutine channel select
goroutine
package main
import "fmt"
import "time"
func printn(id int){
for i := 0;i<10;i++ {
fmt.Println(id,":",i)
}
}
func main(){
for i :=0;i<5;i++ {
go printn(i)
}
fmt.Println("waiting...")
time.Sleep(time.Second * 3)
}
//执行结果：
waiting...
0 : 0
2 : 0
0 : 1
2 : 1
0 : 2
1 : 0
2 : 2
0 : 3
2 : 3
1 : 1
0 : 4
2 : 4
0 : 5
1 : 2
2 : 5
0 : 6
1 : 3
2 : 6
0 : 7
1 : 4
2 : 7
1 : 5
3 : 0
3 : 1
3 : 2
2 : 8
1 : 6
2 : 9
1 : 7
3 : 3
0 : 8
0 : 9
1 : 8
3 : 4
3 : 5
3 : 6
3 : 7
3 : 8
3 : 9
1 : 9
4 : 0
4 : 1
4 : 2
4 : 3
4 : 4
4 : 5
4 : 6
4 : 7
4 : 8
4 : 9
// 如果把sleep去掉会怎么样?
package main
import "fmt"
//import "time"
func printn(id int){
for i := 0;i<10;i++ {
fmt.Println(id,":",i)
}
}
func main(){
for i :=0;i<5;i++ {
go printn(i)
}
fmt.Println("waiting...")
//time.Sleep(time.Second * 3)
}
// 执行结果：
waiting... //原因是没有sleep，当main函数执行完会中断其他所有没执行完的任务2、channel
package main
import "fmt"
//import "time"
func printn(id int,c chan int){
for i := 0;i<10;i++ {
fmt.Println(id,":",i)
}
c <- 0 //将数值存到 c
}
func main(){
c :=make(chan int) // 创建一个channel
go printn(1,c)
// for i :=0;i<5;i++ {
// go printn(i)
// }
fmt.Println("waiting...")
//time.Sleep(time.Second * 3)
<- c // 取出c得值
}
// 执行结果：
waiting...
1 : 0
1 : 1
1 : 2
1 : 3
1 : 4
1 : 5
1 : 6
1 : 7
1 : 8
1 : 93、select
package main
import "fmt"
import "time"
func fun1(c chan string){
for {
c <- "from fun1 +"
time.Sleep(time.Second * 2)
}
}
func fun2(c chan string){
for {
c <- "from fun2 -"
time.Sleep(time.Second * 2)
}
}
func main(){
c1 :=make(chan string)
c2 :=make(chan string)
go fun1(c1)
go fun2(c2)
for {
select {
case msg1 := <- c1:
fmt.Println(msg1)
case msg2 := <- c2:
fmt.Println(msg2)
}
}
}
// 执行结果：
from fun2 -
from fun1 +
from fun2 -
from fun1 +
from fun1 +
from fun2 -
from fun2 -
from fun1 +
from fun1 +
from fun2 -
...........本文出自 “欺壹世De博客” 博客，请务必保留此出处http://qiyishi.blog.51cto.com/5731577/1903692
golang goroutine、channel和select
标签：golang goroutine channel select
原文地址：http://qiyishi.blog.51cto.com/5731577/1903692
