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<p class=MsoNormal><span style='color:#1F497D'>Hm, is there still no one taking
the bait?<o:p></o:p></span></p>

<p class=MsoNormal><span style='color:#1F497D'><o:p>&nbsp;</o:p></span></p>

<p class=MsoNormal><span style='color:#1F497D'>I&#8217;ve made the repro case simpler
still.  Try this on for size:<o:p></o:p></span></p>

<p class=MsoNormal><span style='color:#1F497D'><o:p>&nbsp;</o:p></span></p>

<p class=MsoNormal><span style='color:#1F497D'>import stackless<o:p></o:p></span></p>

<p class=MsoNormal><span style='color:#1F497D'>import sys<o:p></o:p></span></p>

<p class=MsoNormal><span style='color:#1F497D'>    <o:p></o:p></span></p>

<p class=MsoNormal><span style='color:#1F497D'>def profile(*args): pass    <o:p></o:p></span></p>

<p class=MsoNormal><span style='color:#1F497D'>def tasklet():
sys.setprofile(profile)    <o:p></o:p></span></p>

<p class=MsoNormal><span style='color:#1F497D'>t = stackless.tasklet(tasklet)<o:p></o:p></span></p>

<p class=MsoNormal><span style='color:#1F497D'>t()<o:p></o:p></span></p>

<p class=MsoNormal><span style='color:#1F497D'>t.run()<o:p></o:p></span></p>

<p class=MsoNormal><span style='color:#1F497D'><o:p>&nbsp;</o:p></span></p>

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<p class=MsoNormal><b><span style='font-size:10.0pt;font-family:"Tahoma","sans-serif"'>From:</span></b><span
style='font-size:10.0pt;font-family:"Tahoma","sans-serif"'> stackless-bounces@stackless.com
[mailto:stackless-bounces@stackless.com] <b>On Behalf Of </b>Kristján Valur
Jónsson<br>
<b>Sent:</b> Monday, January 28, 2008 10:27<br>
<b>To:</b> Stackless mailing list<br>
<b>Subject:</b> [Stackless] profile error, again<o:p></o:p></span></p>

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<p class=MsoNormal><o:p>&nbsp;</o:p></p>

<p class=MsoNormal><span lang=IS>Okay, I&#8216;ve managed to simplify this a bit.<o:p></o:p></span></p>

<p class=MsoNormal><span lang=IS><o:p>&nbsp;</o:p></span></p>

<p class=MsoNormal><span lang=IS>Run the attached program and watch stackless
get confused.<o:p></o:p></span></p>

<p class=MsoNormal><span lang=IS><o:p>&nbsp;</o:p></span></p>

<p class=MsoNormal><span lang=IS>The point is that I am fiddling with
sys.setprofile() in the context switch callback.<o:p></o:p></span></p>

<p class=MsoNormal><span lang=IS>I do this for a reason:&nbsp; I assume that
this is a global state, and I want to temporarily turn off profiling in this
function because I am doing task switch bookkeeping for the profiler.<o:p></o:p></span></p>

<p class=MsoNormal><span lang=IS><o:p>&nbsp;</o:p></span></p>

<p class=MsoNormal><span lang=IS>Let me repeat the issues that need solving:<o:p></o:p></span></p>

<p class=MsoListParagraph style='text-indent:-18.0pt;mso-list:l0 level1 lfo2'><![if !supportLists]><span
lang=IS><span style='mso-list:Ignore'>1)<span style='font:7.0pt "Times New Roman"'>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
</span></span></span><![endif]><span lang=IS>stackless shouldn&#8216;t freak out at
this.&nbsp; Some frames are obviously being rescheduled or something.<o:p></o:p></span></p>

<p class=MsoListParagraph style='text-indent:-18.0pt;mso-list:l0 level1 lfo2'><![if !supportLists]><span
lang=IS><span style='mso-list:Ignore'>2)<span style='font:7.0pt "Times New Roman"'>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
</span></span></span><![endif]><span lang=IS>I need to be able to turn on
profiling for all tasklets, as a global state, to snapshot a running program.<o:p></o:p></span></p>

<p class=MsoListParagraph style='text-indent:-18.0pt;mso-list:l0 level1 lfo2'><![if !supportLists]><span
lang=IS><span style='mso-list:Ignore'>3)<span style='font:7.0pt "Times New Roman"'>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
</span></span></span><![endif]><span lang=IS>the sys.setprofile() and
stackless. set_schedule_callback do not return the previous value so it is
impossible to temporarily set/unset them and then restore them.<o:p></o:p></span></p>

<p class=MsoNormal><span lang=IS><o:p>&nbsp;</o:p></span></p>

<p class=MsoNormal><span lang=IS>For 2), I am thinking about adding a flag to
stackless, stackless.tracing or something, to enable the old (thread) global
behaviour.<o:p></o:p></span></p>

<p class=MsoNormal><span lang=IS>For 3) I think the change should be
straightforward.&nbsp; I don&#8216;t understand why sys.setprofile() isnt&#8216;t this way
already.<o:p></o:p></span></p>

<p class=MsoNormal><span lang=IS><o:p>&nbsp;</o:p></span></p>

<p class=MsoNormal><span lang=IS>K<o:p></o:p></span></p>

<p class=MsoNormal><span lang=IS><o:p>&nbsp;</o:p></span></p>

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