Thinking about it, use the expected count, in the done process decrement the
count and only print when 0. Thus works if the channels are unbuffered.
> On Dec 18, 2018, at 7:49 AM, Robert Engels <reng...@ix.netcom.com> wrote:
>
> This is not trivial, as you are imposing an order on unrelated async events.
>
> Would you phrase the condition as, do not process a done until I’ve processed
> requests for N routines - then you are back to using an expected count.
>
> With an expected count, the problem is trivial.
>
> I think you need to step back and decide what you are trying to parallelize.
>
>> On Dec 18, 2018, at 7:34 AM, Chris Burkert <burkert.ch...@gmail.com> wrote:
>>
>> Dear all,
>>
>> I have a couple of goroutines sending multiple results over a channel - a
>> simple fan-in. They signal the completion on a done channel. Main selects on
>> the results and done channel in parallel. As the select is random main
>> sometimes misses to select the last result. What would be the idiomatic way
>> to prevent this and completely drain the result channel?
>>
>> Here is a minmal example which sometimes prints one 0 but should always
>> print two of them:
>>
>> package main
>>
>> import (
>> "fmt"
>> )
>>
>> func do(rc chan<- int, dc chan<- bool) {
>> rc <- 0
>> dc <- true
>> }
>>
>> func main() {
>> worker := 2
>> rc := make(chan int, worker)
>> done := 0
>> dc := make(chan bool, worker)
>> for i := 0; i < worker; i++ {
>> go do(rc, dc)
>> }
>> for done < worker {
>> select {
>> case <-dc:
>> done++
>> case r := <-rc:
>> fmt.Println(r)
>> }
>> }
>> }
>>
>> many thanks
>> Chris
>> --
>> You received this message because you are subscribed to the Google Groups
>> "golang-nuts" group.
>> To unsubscribe from this group and stop receiving emails from it, send an
>> email to golang-nuts+unsubscr...@googlegroups.com.
>> For more options, visit https://groups.google.com/d/optout.
> --
> You received this message because you are subscribed to the Google Groups
> "golang-nuts" group.
> To unsubscribe from this group and stop receiving emails from it, send an
> email to golang-nuts+unsubscr...@googlegroups.com.
> For more options, visit https://groups.google.com/d/optout.
--
You received this message because you are subscribed to the Google Groups
"golang-nuts" group.
To unsubscribe from this group and stop receiving emails from it, send an email
to golang-nuts+unsubscr...@googlegroups.com.
For more options, visit https://groups.google.com/d/optout.
