[Stackless] Documentation of tasklet life cycle (was Re: Open Stackless issues)

Richard Tew richard.m.tew at gmail.com
Wed Sep 4 20:18:35 CEST 2013


Tasklets blocked on channels can be pickled.

>>> import stackless
>>> c = stackless.channel()
>>> def f(ct):
...     print "in"
...     ct.receive()
...     print "out"
...
>>> t = stackless.tasklet(f)(c)
>>> t.run()
in
>>> import cPickle
>>> s = cPickle.dumps(t)
>>> s
"cstackless\ntasklet\np1\n(tRp2\n(I3\nNI0\n(lp3\ncstackless._wrap\nframe\np4\n(c
stackless._wrap\ncode\np5\n(I1\nI1\nI1\nI67\nS'd\\x01\\x00GH|\\x00\\x00j\\x00\\x
00\\x83\\x00\\x00\\x01d\\x02\\x00GHd\\x00\\x00S'\np6\n(NS'in'\np7\nS'out'\np8\nt
p9\n(S'receive'\np10\ntp11\n(S'ct'\ntp12\nS'<stdin>'\np13\nS'f'\nI1\nS'\\x00\\x0
1\\x05\\x01\\n\\x01'\np14\n(t(ttRp15\n(tbtRp16\n(g15\nI1\nS'eval_frame_value'\np
17\nc__builtin__\ngetattr\np18\n(c__builtin__\n__import__\np19\n(S'__main__'\n(t
(t(S''\nttRp20\nS'__dict__'\ntRp21\nI0\n(dNNI13\nI1\n(t((tcstackless\nchannel\np
22\n(tRp23\n(I-1\nI6\n(lp24\ng2\natbttbatb."
>>>


On 9/5/13, Andrew Francis <andrewfr_ice at yahoo.com> wrote:
> Hi Anselm:
>
> ----------------------------------------------------------------------
>
> Message: 1
> Date: Wed, 04 Sep 2013 15:07:51 +0200
> From: Anselm Kruis <a.kruis at science-computing.de>
> To: stackless at stackless.com
> Subject: [Stackless] Documentation of tasklet life cycle (was Re: Open
>     Stackless issues)
> Message-ID: <522730A7.3070900 at science-computing.de>
> Content-Type: text/plain; charset="iso-8859-1"; format="flowed"
>
>>I just created a first draft of a state diagram for the tasklet life
>>cycle. It is here:
>
>>http://www.stackless.com/ticket/24#comment:11
>
>>Any comments and suggestions are highly welcome.
>
>
> Nice work. Some comments:
>
> What is the difference between a tasklet that is not alive (i.e., not bound
> to a callable) and a tasklet that is not alive (but bounded to a callable).
> Should there be a dead state?
>
> Do you really need to distinguish between the "running" state and the
> "running in scheduler" state? Isn't the difference between stackless.run()
> and tasklet.run() a matter of when a tasklet is scheduled?
>
> Does a tasklet that is pickled or blocked on a channel require a special
> state (since a tasklet blocked on a channel cannot be pickled)?
>
> Cheers,
> Andrew



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