[Stackless] Stackless 2.6.2/Win crash with very short script

Christian Tismer tismer at stackless.com
Thu Dec 24 12:56:25 CET 2009

Hi friends,

was this one resolved, and the thread name chaged?

cheers - chris

On 8/13/09 10:51 PM, Kristján Valur Jónsson wrote:
> I don't know.  I've uncovered some nastyness in the process.
> Soft switching is fragile with regards to channel refcounting and the fix I have in mind is very simple.  But having it in action actually showed some other strange behavior that I"m looking at.
> K
>> -----Original Message-----
>> From: Richard Tew [mailto:richard.m.tew at gmail.com]
>> Sent: 13. ágúst 2009 20:32
>> To: Kristján Valur Jónsson
>> Cc: Stefan Reich; stackless at stackless.com
>> Subject: Re: [Stackless] Stackless 2.6.2/Win crash with very short
>> script
>> 2009/8/14 Kristján Valur Jónsson<kristjan at ccpgames.com>:
>>> I've more or less given up on this.
>>> The problem  The problem is that the engine is in a fragile state
>> until a soft-switch has completed.  This is especially true for a hard-
>> switch wrapped in a soft switch, i.e. one where a "jump_soft_to_hard
>> has been put on the frame.  Until that jump is actually performed, one
>> cannot switch away from that tasklet.
>>> In effect it means that if a stackless (or semi stackless with
>> jump_soft_to_hard) jump has been set up but not done, we cannot call
>> switch tasks.  And task switching occurs if a reference goes away,
>> which is possible through multiple means in the meantime.
>>> Maybe the best way is to put channels, wich are in such a state as to
>> require waking up a tasklet to die, in a special garbage bin, that is
>> emptied in a safe place on a regular basis.  I'll try that next.
>> My worry about the potential fixes you have described for this bug,
>> are that they are top heavy for what they are addressing.  Let's be
>> honest here, what we have is a case that crashes that no-one would
>> ever do in production.  Making larger fixes than the problem itself,
>> well, I wonder if we are incurring additional codebase complexity for
>> little benefit.
>> I say let this one sit.
>> Cheers,
>> Richard.
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