On Friday, November 1, 2019 at 10:30:50 AM UTC-4, Shulhan wrote:
> On Fri, 1 Nov 2019, 21:07 burak sarac, <bura...@gmail.com <javascript:>> 
> wrote:
>>  I have a go routine running something like 'hash.sum(data)' using import 
>> "hash" that I want to terminate immediately in case of user wants to 
>> kill, I can not send channel to notify. 
> I have not tried this, but you can use a combination of defer, panic and 
> recover to unroll the process.
> The recover function is inside calculate, and the for-loop is running in 
> goroutine before calculate.
>    defer func() { recover() }
>    go loop()
>    calculate()
> Inside the loop() you will call panic("terminate").
> -- Shulhan

Shulhan - I think the point was that Burak does not have control over the 
code for the function that we want to interrupt. So he has no ability to 
insert a panic. 

Burak - I do not believe there is a generic way to interrupt a function or 
goroutine which does not take a Context, or have some other interruption 
method baked in. I know the idea of being able to "kill" a goroutine has 
been discussed before, and has generally gone nowhere. 

It might be useful to have more details of the call, and to understand why 
you need to interrupt this function. Assuming the hash.sum() you refer to 
takes a []byte, then how long could it reasonably take? The best bet might 
be to simply let it finish and ignore the result. Of course, if the 
function is being sourced off an io.Reader(), or something like that, then 
you might be able to interrupt the stream by wrapping the interface with 
some of your own code.

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