為什么這段代碼會導(dǎo)致數(shù)據(jù)競爭？我已經(jīng)使用了原子添加。package mainimport (    "sync/atomic"    "time")var a int64func main() {    for {        if a < 100 {            atomic.AddInt64(&a, 1)            go run()        }    }}func run() {    <-time.After(5 * time.Second)    atomic.AddInt64(&a, -1)}我go run --race用這段代碼運(yùn)行命令并得到：==================WARNING: DATA RACEWrite at 0x000001150f30 by goroutine 8:  sync/atomic.AddInt64()      /usr/local/Cellar/go/1.11.2/libexec/src/runtime/race_amd64.s:276 +0xb  main.run()      /Users/flask/test.go:22 +0x6dPrevious read at 0x000001150f30 by main goroutine:  main.main()      /Users/flask/test.go:12 +0x3aGoroutine 8 (running) created at:  main.main()      /Users/flask/test.go:15 +0x75==================你能幫我解釋一下嗎？以及如何解決此警告？謝謝！