Hi rog, As -> and <- are 'not racy', because they are 'core' language features, because runtime handles them, because they are guaranteed to 'work', I am asking how easy and useful to implement them as 'core' language features.
Thank you.. On Thursday, February 21, 2019 at 9:04:22 PM UTC+3, rog wrote: > > As others have said, such operations are inherently racy - when you > receive the message that a channel is empty, it may not be empty any more. > For that reason, it's not a good idea to add them as primitives to the > language. > > That said, it's not too hard to implement them yourself. We are talking > about buffered channels here, so an extra item being buffered should be OK. > So you can insert a goroutine in between sender and receiver that signals > when it can't receive on a channel (it's empty) or when it can't send on a > channel (it's full). > > Here's some code that implements those operations: > > https://play.golang.org/p/2xyZnUI0imX > > Note that there are many other possible variants. For example, you might > want to send on the notification channel only when the channel has been > idle for some time. > > cheers, > rog. > > > On Thu, 21 Feb 2019 at 13:38, Serhat Şevki Dinçer <jfcg...@gmail.com > <javascript:>> wrote: > >> Hi, >> >> Say you have a buffered channel >> ch := make(chan int, 10) >> >> Would it make sense and be easy to add the following directives to the Go >> language core? >> >> waitempty(ch) >> blocks caller until ch buffer is empty >> >> waitfull(ch) >> blocks caller until ch buffer is full >> >> This means there are 3 types of goroutines related to a channel: >> - senders >> - receivers >> - observers >> >> There are nice possibilities with these, for example wait groups, >> resource usage alerts etc. >> >> What do you think? >> >> -- >> 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...@googlegroups.com <javascript:>. >> 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.
