在Golang中，如何使用通道处理许多goroutine

Question

I'm thinking start 1000 goroutines at the same time using for loop in Golang.
The problem is: I have to make sure that every goroutine has been executed.
Is it possible using channels to help me make sure of that?

The structure is kinda like this:

func main {
    for i ... {
        go ...
        ch?
    ch?
}

Answer 1

Yes, try this:

package main

import (
    "fmt"
)

const max = 1000

func main() {
    for i := 1; i <= max; i++ {
        go f(i)
    }

    s := 0
    for i := 1; i <= max; i++ {
        s += <-ch
    }

    fmt.Println(s)
}

func f(n int) {
    // do a job here
    ch <- n
}

var ch = make(chan int, max)

output:

500500