Sorry for miss some code, the code should be like this:
package main
import (
"sync"
"sync/atomic"
)
func main() {
var n int32
var m sync.RWMutex
go func() {
for {
atomic.LoadInt32(&n)
}
}()
go func() {
for {
m.RLock()
atomic.AddInt32(&n, 1)
m.RUnlock()
}
}()
go func() {
for {
m.Lock()
n = 0
m.Unlock()
}
}()
go func() {
for {
m.Lock()
n -= 1
m.Unlock()
}
}()
}
Playground link: https://play.golang.org/p/Mrdetw46mXR
在 2019年7月5日星期五 UTC+8下午6:40:32，White Pure写道：
>
> Hi,
> I wrote some code like below these days, and my colleagues and me are
> not sure if the code has any concurrent problem.
> Can someone help to figure out if the code has any race problem?
> Thanks very much!
>
> Code:
>
>> package main
>
>
>> import (
>
> "sync"
>
> "sync/atomic"
>
> )
>
>
>> func main() {
>
> var n int32
>
> var m sync.RWMutex
>
> go func() {
>
> for {
>
> atomic.LoadInt32(&n)
>
> }
>
> }()
>
> go func() {
>
> for {
>
> m.RLock()
>
> atomic.AddInt32(&n, 1)
>
> m.RUnlock()
>
> }
>
> }()
>
> go func() {
>
> for {
>
> m.Lock()
>
> n = 0
>
> m.Unlock()
>
> }
>
> }()
>
> // do something to keep goroutines running here
>
> ......
>
> }
>
>
> Playground link: https://play.golang.org/p/fRa09l3VQob
>
>
>
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