barrier.go

package main

import (
	"log"
	"math/rand"
	"time"
)

type Barrier struct {
	// TODO
}

func NewBarrier(n int) *Barrier {
	// TODO
}

func (b *Barrier) Wait() {
	// TODO
}

func main() {
	b := NewBarrier(3)

	for i := 0; i < 10; i++ {
		go func(jobId int) {
			sleepSecs := rand.Int31n(9)
			log.Printf("%d: start (sleep %d seconds)\n", jobId, sleepSecs)
			time.Sleep(time.Duration(sleepSecs+1) * time.Second)
			log.Printf("%d: wait\n", jobId)
			b.Wait()
			log.Printf("%d: continue\n", jobId)
		}(i)
	}

	time.Sleep(10 * time.Second)
}