试了一下,简直牛逼。鉴于处于快速入门阶段,就不去挖底层原理了,等面铺开了再深入。
用一个有点并发经验的人都能看出来的例子,累加:
package main
import (
"fmt"
"sync"
)
func main() {
var count = 0
// 使用WaitGroup等待10个goroutine完成
var wg sync.WaitGroup
wg.Add(10)
for i := 0; i < 10; i++ {
go func() {
defer wg.Done()
// 对变量count执行10次加1
for j := 0; j < 10000; j++ {
count++
}
}()
}
// 等待10个goroutine完成
wg.Wait()
fmt.Println(count)
}
不上锁时是这样的:
PS C:\Users\Administrator\Desktop\go> go build main.go
PS C:\Users\Administrator\Desktop\go> .\main.exe
49376
接下来让我们看看 race detetor 的表现:
PS C:\Users\Administrator\Desktop\go> go build -race main.go
PS C:\Users\Administrator\Desktop\go> .\main.exe
==================
WARNING: DATA RACE
Read at 0x00c0000ac078 by goroutine 8:
main.main.func1()
C:/Users/Administrator/Desktop/go/main.go:18 +0xa8
Previous write at 0x00c0000ac078 by goroutine 7:
main.main.func1()
C:/Users/Administrator/Desktop/go/main.go:18 +0xba
Goroutine 8 (running) created at:
main.main()
C:/Users/Administrator/Desktop/go/main.go:14 +0x8d
Goroutine 7 (finished) created at:
main.main()
C:/Users/Administrator/Desktop/go/main.go:14 +0x8d
==================
48462
Found 1 data race(s)
懂得都懂,真正项目里的资源竟态隐藏的都很深,一爆出来那死伤是难以估量的。