I suspect it's because your reference to the time_array is actually copying it
into your closure that's running as the goroutine instead of making a reference
to it. You might do better to pass that array as a parameter to the goroutine
instead of trying to absorb it as context.
I should note that your approach of filling a statically sized array is
probably not the best one, because that's going to eventually panic once you
hit the limit. But that's a bit out of scope of this discussion, and I'm sure
you mostly meant it for illustrative purposes.
- Dave
> On Feb 16, 2019, at 9:29 AM, Hemant Singh <hemanti...@gmail.com> wrote:
>
> I have the following program. The program is processing network packets at 1
> Gbps rate. I don't want to print the rate for every packet. Instead, I'd
> like to save the rate in an array and dump the array on Ctrl-c of the
> program. When I dump the array on Ctrl-c, the data is all zeroes. Please
> see "<===" in the program below. Anything else one could do?
>
> Thanks.
>
> -Hemant
>
> func main() {
>
> const SZ = 65536
> var time_array [SZ]float64
>
> c := make(chan os.Signal)
> signal.Notify(c, os.Interrupt, syscall.SIGTERM)
>
> go func() {
> <-c
> fmt.Printf("You pressed ctrl + C. User interrupted infinite loop.")
> fmt.Printf("%v ", time_array); <=== all zeroes printed.
> os.Exit(0)
> }()
>
>
> i := 0
> for {
> ...
> time_array[i] = rate
> fmt.Printf("%f bps ", rate) <=== value printed is correct.
> i++
> }
> }
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