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package main
import (
"fmt"
"sync"
"time"
)
type Data struct {
value int
lock  sync.Mutex
}
func main() {
data := Data{}
var wg sync.WaitGroup
for i := 0; i < 1000; i++ {
wg.Add(1)
go func(i int) {
defer wg.Done()
data.setValue(i)
}(i)
}
wg.Wait()
fmt.Println(data.getValue())
}
func (d *Data) setValue(value int) {
d.lock.Lock()
defer d.lock.Unlock()
time.Sleep(time.Millisecond) // 妯℃嫙鑰楁椂鎿嶄綔
d.value += value
}
func (d *Data) getValue() int {
d.lock.Lock()
defer d.lock.Unlock()
return d.value
}

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