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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