39. channel管道 | 厚土Go学习笔记

ch <- v    //赋值给管道，管道接收值
v := <- ch    //管道发送值

ch := make(chan int)

package main

import "fmt"

func sum(a []int, c chan int)  {
    sum := 0
    for _, v := range a{
        sum += v
    }
    c <- sum
}
func main() {
    a := []int{2, 0, 1, 7, 0, 8, 2, 7, 1, 7, 4}
    c := make(chan int)
    go sum(a[:len(a)/2], c)
    go sum(a[len(a)/2:], c)
    x, y := <-c, <-c
    fmt.Println(x, y, x + y)
}

29 10 39

ch := make(chan int, 100)

package main

import "fmt"

func main() {
    ch := make(chan int, 2)
    ch <- 100
    ch <- 5
    fmt.Println(<-ch)
    fmt.Println(<-ch)
}

100
5

ch <- 100
ch <- 5
ch <- 77

fatal error: all goroutines are asleep - deadlock!