[Stackless] Newbie question

Christian Tismer tismer at stackless.com
Sun Sep 21 19:31:42 CEST 2008


Richard Tew wrote:
> On Wed, Sep 3, 2008 at 4:08 PM, Jay Shaffstall <jshaffstall at gmail.com> wrote:
>> I'd thought that each tasklet would run once, round robin style, with
>> all others getting run once before the first ran again.  A tasklet
>> that tried to receive on an empty channel would block, and when
>> another tasklet sent to that channel the first would unblock and go
>> back into the round robin queue.
>>
>> Am I misunderstanding how stackless works?  Because what I think I'm
>> seeing is that the receiving tasklet runs immediately.  I don't have
>> any call to stackless.run, but as soon as I call send on a channel,
>> the receiving tasklet runs, rather than having the send queue up until
>> the tasklet is next up to run.
> 
> This behaviour is defined by the 'preference' attribute of the channel:
> 
>>>> help(stackless.channel.preference)
> Help on getset descriptor __builtin__.channel.preference:
> 
> preference
>     -1 prefer receiver (default), 1 prefer sender, 0 don't
>     prefer anything. See also schedule_all
> 
> You probably want to set it to 1 for your channel.

FWIW, my guess is that he wants the 0 preference, just adding
the receiver to the round robin list.

cheers - chris

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