It depends. Checking the context (btw "if err := ctx.Err(); err != nil {
return err }" is enough, no need for "select")
is cheap but not free. So partition for reasonable sized chunks of work.
Tamás
Gurunandan Bhat a következőt írta (2023. július 21., péntek, 9:21:15 UTC+2):
> Sorry - I meant ..."calling select once per line...." be a good point
>
> On Fri, Jul 21, 2023 at 12:41 PM Gurunandan Bhat <gb...@pobox.com> wrote:
>
>> Hi,
>>
>> Are there any common patterns that standard and 3rd party library
>> functions use to implement cancelling a context passed to it? I have looked
>> at the source of exec.CommandContext and it starts the process and spawns a
>> goroutine that kills the process when ctx.Done() is closed. That looks
>> simple enough.
>>
>> It seems to me that the key to implementing cancellation enabled function
>> is to look at specific points inside the function where ctx.Done() is
>> checked for. As an example, if I want to create a cancellable function that
>> reads lines from a file, would select'ing on ctx.Done() be a good place?
>>
>> Thanks.
>>
>
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