Wait for the termination of n goroutines

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问题内容

I need to start a huge amount of goroutines and wait for their termination. The intuitive way seems to use a channel to wait till all of them are finished :

package main

type Object struct {
    //data
}

func (obj *Object) Update(channel chan int) {
    //update data
    channel 
But the problem is that the amount of objects and therefore the amount of
goroutines could change. Is it possible to change the buffer size of a channel
?
Is there maybe a more elegant way to do this ?

    正确答案

I've used WaitGroup as a solution to
this problem. Translating your current code, with some logs to make it clear
what's happening:
package main

import "sync"
import "fmt"
import "time"

type Object struct {
    //data
}

func (obj *Object) Update(wg *sync.WaitGroup) {
    //update data
    time.Sleep(time.Second)
    fmt.Println("Update done")
    wg.Done()
    return
}

func main() {
    var wg sync.WaitGroup
    list := make([]Object, 5)
    for {
        for _, object := range list {
            wg.Add(1)
            go object.Update(&wg)
        }
        //now everything has been updated. start again
        wg.Wait()
        fmt.Println("Group done")
    }
}
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