Another idea might be to avoid making the costly Done check every time.
Something like this perhaps (untested)?
// NewDoneChecker returns a DoneChecker value
// that amortizes the cost of calling ctx.Done by only
// calling ctx.Done every interval times that
// DoneChecker.Done is called.
func NewDoneChecker(ctx context.Context, interval int) *DoneChecker {
return &DoneChecker{
ctx: ctx,
interval: interval,
}
}
type DoneChecker struct {
ctx context.Context
interval int
n int
done bool
}
// Done reports whether the underlying context has reported
// that it is done. It only does the check every so often.
func (c *DoneChecker) Done() bool {
c.n--
if c.n > 0 || c.done {
return c.done
}
select {
case <-c.ctx.Done():
c.done = true
return true
default:
c.n = c.interval
return false
}
}
On Thu, 23 May 2019 at 10:40, Max <massimiliano.ghila...@gmail.com> wrote:
> A bit less "funky" idea - I currently use it in my
> https://github.com/cosmos72/gomacro
> to interrupt the interpreter if the user hits Ctrl+C.
> Caveat: I don't know how difficult is to adapt it to GoAWK.
>
> The idea is conceptually simple: loop unrolling. The details are slightly
> tricky:
>
> unroll the interpreter main loop that executes statements by something
> like 20 times,
> and after the 20 iterations check *once* for externally-set flags:
> timeout, Ctrl+C, etc.
> The tricky part is: you also need to handle the case where you are
> somewhere in the middle
> of the 20 unrolled iterations but suddenly there are no more statements to
> execute.
>
> The skeleton code might look similar to
> https://github.com/cosmos72/gomacro/blob/master/fast/code.go#L169
> or https://github.com/cosmos72/gomacro/blob/master/fast/code.go#L204
>
> Regards,
> Cosmos72
>
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