[Python-ideas] channel (synchronous queue)

[Matt Joiner]

Yes, channels can allow for this, but as with locks directionality and
ordering matter. Typically messages will only run in a particular
direction. Nor will all channels be synchronous (they're a tool, not a
panacea), they might be intermixed with infinite asynchronous queues as is
commonplace at the moment.
On Feb 19, 2012 8:19 AM, "Sturla Molden" <sturla at molden.no> wrote:

> Den 18.02.2012 16:38, skrev Matt Joiner:
>
>> Recently (for some) the CSP style of channel has become quite popular
>> in concurrency implementations. This kind of channel allows sends that
>> do not complete until a receiver has actually taken the item. The
>> existing  queue.Queue would act like this if it didn't treat a queue
>> size of 0 as infinite capacity.
>>
>> In particular, I find channels to have value when sending data between
>> threads, where it doesn't make sense to proceed until some current
>> item has been accepted.
>>
>
> That is the most common cause of deadlock in number crunching code using
> MPI.
>
> Process A sends message to Process B, waits for B to receive
> Process B sends message to Process A, waits for A to receive
>
> ... and now we just wait ...
>
> I am really glad the queues on Python do not do this.
>
> Sturla
>
>
>
>
>
>
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