On Wednesday, January 25, 2017 at 10:14:49 PM UTC+8, Jan Mercl wrote:
>
> On Wed, Jan 25, 2017 at 2:14 PM T L <tapi...@gmail.com <javascript:>>
> wrote:
>
> > sometimes, I do want one case on a select block get selected even if
> there are multiple unblocked cases.
> > For example, I don't want the dataCh case is selected if the stopCh and
> the timer channel are unblocked:
>
> select {
> case <-priorityHigh:
> ...
> default:
> select {
> case <-priorityLow:
> ...
> default:
> select {
> case <- priorityLowest:
> ...
> }
> }
> }
>
> --
>
> -j
>
It is really a solution. :)
Sometimes I use the following one:
select {
case <- stopCh:
return
default:
}
select {
case <- stopCh:
return
case value := <-dataCh:
}
But both our solutions are not less efficient than a priority select.
How about to enhance the select block syntax by assign a sort method for
unblocked cases:
select (random | priority | ordered) {
case <- stopCh:
return
case value := <-dataCh:
}
random: the current implementation
priority: by the case appearance order
ordered: one by one. (The last selected case will be the last candidate in
the next round)
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