@Silviu
But no slice expansion is happening.
On Sunday, April 22, 2018 at 5:41:11 AM UTC+4:30, Silviu Capota Mera wrote:
>
> Hi Kaveh,
>
> Change the line:
> *ptr = append(*ptr, []byte(fmt.Sprint*f("%02d"*, k1))...)
>
> to
> *ptr = append(*ptr, []byte(fmt.Sprintf(*"%15d"*, k1))...)
>
> The buckets will overlap (more than 10 bytes) and you will get the race
> triggered in the detector
>
> Silviu
>
>
> On Saturday, 21 April 2018 12:40:04 UTC-4, Kaveh Shahbazian wrote:
>>
>> @Ankit That's what I thought. Yet the code is accessing the same
>> underlying array. That is the part that worries me and -race does not
>> complain.
>>
>> @Louki Still no complain from -race!
>> https://play.golang.org/p/dUt0QE63RDK
>>
>> On Saturday, April 21, 2018 at 7:01:25 PM UTC+4:30, Louki Sumirniy wrote:
>>>
>>> Unless you pass pointers in Go, every time you hop in and out of a new
>>> scope any changes are discarded. This is why unless you type-bind with
>>> pointers you don't actually have an OOP method, as the function will not
>>> act upon the parent variable/structure.
>>>
>>> I think if you change your playground code to pass pointers into the
>>> goroutines you'll either see race detector or clobbering.
>>>
>>> On Saturday, 21 April 2018 16:30:22 UTC+3, Ankit Gupta wrote:
>>>>
>>>> @Kaveh
>>>>
>>>> Slices are values but they refer to the same back array location. You
>>>> have created localized v which is appended inside goroutine which refer to
>>>> a location containing its own byte array of len=10. So, you are not really
>>>> referencing the same memory location as other v slice in the goroutine.
>>>> You
>>>> will be affected if you remove k,v:=k,v or append more than 10 bytes to v
>>>> inside goroutine which will take up space on next slice's bytes.
>>>>
>>>> On Saturday, April 21, 2018 at 2:30:53 PM UTC+5:30, Kaveh Shahbazian
>>>> wrote:
>>>>>
>>>>> @ Louki Sumirniy
>>>>> Slices are values AFAIK. There is no passby pointer.
>>>>>
>>>>> And the point is, race detector does not flag anything:
>>>>> https://play.golang.org/p/NC8mBwS1-0P
>>>>>
>>>>
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