goroutine

test1.go

package main

import "sync"

type atom struct {
	sync.Mutex
	i uint64
}

func main() {
	var a atom

	for {
		go func() {
			a.Lock()
			println(a.i, "i'm in")
			// println(a.i, time.Now().Format(time.RFC3339Nano))
			a.i++
			println(a.i, "is next turn")
			a.Unlock()
			select {}
		}()
	}
}

test2.go

package main

import "time"

func main() {
	c := make(chan uint64)

	go func() {
		c <- 0
	}()

	for {
		go func() {
			i := <-c
			println(i, "i'm in")
			// println(a.i, time.Now().Format(time.RFC3339Nano))
			c <- i + 1
			select {}
		}()
	}

	time.Sleep(10 * time.Second)
}