But then calling it or not has the exact same semantics. So what's it even
good for?
On Thu, Feb 21, 2019, 21:17 Serhat Şevki Dinçer <jfcga...@gmail.com> wrote:
> btw waitempty(ch) does not return any value, and it does not (have to)
> guarantee that ch stays empty when it returns..
>
>
> On Thursday, February 21, 2019 at 11:10:45 PM UTC+3, Serhat Şevki Dinçer
> wrote:
>>
>> Burak, I think you dont get the potential of the suggesred directives.
>>
>> You can be interested in waitepty(ch) for example when:
>> - you have direct control of who is pushing and pulling on it, and you
>> know what an empty buffer means
>> buffer could be "things to do or process", and you have a very
>> easy-to-setup observer to alert some routine that:
>> - you are out of job, or
>> - you have too many to process
>>
>> Also what you suggest as raciness is irrelevant:
>>
>> for {
>> x := <- ch {
>> // here, do you have a guarantee that you can put x back to the
>> channel ??
>> }
>> }
>>
>> On Thursday, February 21, 2019 at 10:57:43 PM UTC+3, Burak Serdar wrote:
>>>
>>> You can implement waitempty(ch) without a race condition. However, any
>>> scenario in which you use waitempty(ch) would have a race condition,
>>> because the moment it returns there is no guarantee on the state of
>>> the channel. So in a piece of code like this:
>>>
>>> waitempty(ch)
>>> post
>>>
>>>
>>> the only guarantee you have is that when 'post' is running, ch was
>>> empty at least once since waitempty was called.
>>>
>>> This code:
>>>
>>> for {
>>> if waitempty(ch) {
>>> ...
>>> }
>>> }
>>>
>>> is racy, because when you go into the if block, you have no idea how
>>> many times ch was empty.
>>>
>> --
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