On Thu, Nov 12, 2020 at 6:19 PM 陶青云 <qingyu...@gmail.com> wrote:
> ```
> // c is buffered channel
> select {
> case c <- result:
> default:
> // full, drop old one
> <-c
> c <- result
> }
> ```
>
> I have a code like this, but there may be a race condition in the default
> case. I enconter a
> deadlock that the goroutine block on 'c<'.
>
In addition to what Ian said you should note that a buffered channel is
essentially a FIFO queue. The equivalent code that operates on a queue in
any other language (e.g., Python) will have the same race. What you're
asking for is something like the behavior provided by an API such as
Python's collections.deque
<https://docs.python.org/2/library/collections.html#collections.deque>.
Whether any of the solutions you might find by searching for something like
"golang deque" satisfy your requirements can't be answered given the
information you have provided.
--
Kurtis Rader
Caretaker of the exceptional canines Junior and Hank
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