@gramyang #2

type counter struct {
sync.Mutex
value int
}

func test2() {
runtime.GOMAXPROCS(1)
var wg sync.WaitGroup
wg.Add(1000)
c := new(counter)
c.value=0
for i := 0; i < 1000; i++ {
go func(c *counter) {
c.Lock()
defer c.Unlock()
c.value++
wg.Done()
}(c)
}
wg.Wait()
fmt.Println("数数：", c.value)
}

func main() {
test2()
}