今天给大家讲解下go语言开多进程。

package main

import (
    "fmt"
    "time"
)

var c chan int

func main() {
    c = make(chan int)
    go waiting("coffee", 1)
    go waiting("tea", 2)
    fmt.Println("I,am waiting")
    //time.Sleep(3 * time.Second)
    <-c
    <-c
}

func waiting(w string, sec int) {

    time.Sleep(time.Duration(sec) * time.Second)
    fmt.Println(w, "is ready")
    c <- 1
}

如果进程开的比较多，怎样去避免去写多个结束进程的channel，下面我来给大家发下改进版：

package main

import (
    "fmt"
    "time"
)

var c chan int

func main() {
    c = make(chan int)
    go waiting("coffee", 1)
    go waiting("tea1", 2)
    go waiting("tea2", 3)
    go waiting("tea3", 4)
    go waiting("tea4", 5)
    go waiting("tea5", 6)
    go waiting("tea6", 7)
    fmt.Println("I,am waiting")
    //time.Sleep(3 * time.Second)
    i := 0
L:
    for {
        select {
        case <-c:
            i++
            if i > 6 {
                break L
            }
        }
    }
}

func waiting(w string, sec int) {

    time.Sleep(time.Duration(sec) * time.Second)
    fmt.Println(w, "is ready")
    c <- 1
}