> There are 1000 go routines started here, each of them using the same
> customReader. This where the data race comes from.
I think you are mistaken. I create customReader for EACH of the goroutines.
Notice that in every loop I pass it to the goroutine func.
And if you want you can remove this goroutine stuff and you will notice
that the races still appear - the goroutines are just for making sure that
we will hit aformentioned scenarios faster.
W dniu środa, 6 marca 2019 01:12:11 UTC+1 użytkownik Paweł Szczur napisał:
>
> wg := &sync.WaitGroup{}
>> for i := 0; i < 1000; i++ {
>> reader := &customReader{size: 900000}
>> wg.Add(1)
>> go func(r *customReader) {
>> for {
>> req, err := http.NewRequest(http.MethodPut, "http://"+addr1+"/first";, r)
>> if err != nil {
>> fmt.Printf("%v", err)
>> }
>> req.GetBody = func() (io.ReadCloser, error) {
>> return &customReader{size: 900000}, nil
>> }
>>
>> if resp, err := client.Do(req); err != nil {
>> // fmt.Printf("error: %v", err)
>> } else if resp.StatusCode >= http.StatusBadRequest {
>> // fmt.Printf("status code: %d", resp.StatusCode)
>> }
>>
>> // Reset reader and try to reuse it in next request
>> r.Reset()
>> }
>>
>> wg.Done()
>> }(reader)
>> }
>>
>
> There are 1000 go routines started here, each of them using the same
> customReader. This where the data race comes from.
> The redirection has nothing to do with it.
>
> Multiple parallel r.Read / r.Reset calls will cause it to cause problems.
> You either don't run in as go routine or create new customReader for each
> routine.
>
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