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<p class="MsoNormal">I’ve posted my reply in the RE: [squeak-dev] Freezing UI issue thread.</p>
<p class="MsoNormal">Thanks Marcel!</p>
<p class="MsoNormal">Jaromir</p>
<p class="MsoNormal"><o:p> </o:p></p>
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<p class="MsoNormal" style="border:none;padding:0in"><b>From: </b><a href="mailto:marcel.taeumel@hpi.de">Marcel Taeumel</a><br>
<b>Sent: </b>Wednesday, July 6, 2022 10:42<br>
<b>To: </b><a href="mailto:squeak-dev@lists.squeakfoundation.org">squeak-dev</a><br>
<b>Subject: </b>Re: [squeak-dev] The Inbox: Morphic-jar.2018.mcz</p>
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<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal"><span style="font-size:10.0pt;font-family:"Arial",sans-serif;color:black">Hi Jaromir --<o:p></o:p></span></p>
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<p class="MsoNormal"><span style="font-size:10.0pt;font-family:"Arial",sans-serif;color:black"><o:p> </o:p></span></p>
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<p class="MsoNormal"><span style="font-size:10.0pt;font-family:"Arial",sans-serif;color:black">This looks a bit "too clever" for me.<o:p></o:p></span></p>
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<p class="MsoNormal"><span style="font-size:10.0pt;font-family:"Arial",sans-serif;color:black"><o:p> </o:p></span></p>
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<p class="MsoNormal"><span style="font-size:10.0pt;font-family:"Arial",sans-serif;color:black">Process simulation would not work, right? And if we argue that no one wants to simulate a Morphic UI process at that level, I would argue that no Morphic application
code should wait for a custom semaphore in the UI loop. ;-) Let's not forget that CMD+Dot still works so that the application programmer can discover such a mistake.<o:p></o:p></span></p>
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<p class="MsoNormal"><span style="font-size:10.0pt;font-family:"Arial",sans-serif;color:black"><o:p> </o:p></span></p>
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<p class="MsoNormal"><span style="font-size:10.0pt;font-family:"Arial",sans-serif;color:black">The fact that we can actually closure the binding while creating it is nice, but do we have to rely on this really to fix our problem?<o:p></o:p></span></p>
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<p class="MsoNormal"><span style="font-size:10.0pt;font-family:"Arial",sans-serif;color:black"><o:p> </o:p></span></p>
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<p class="MsoNormal"><span style="font-size:10.0pt;font-family:"Arial",sans-serif;color:black">The issue is scattered already via #spawnNewProcessIfThisIsUI: and the debugger's errorWasInUIProcess resume logic. If we now obfuscate the that very simple main
loop to support yet another edge case ... I hope we can do better. I don't yet see how.<o:p></o:p></span></p>
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<p class="MsoNormal"><span style="font-size:10.0pt;font-family:"Arial",sans-serif;color:black"><o:p> </o:p></span></p>
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<p class="MsoNormal"><span style="font-size:10.0pt;font-family:"Arial",sans-serif;color:black">Finally, I think you actually want to check<o:p></o:p></span></p>
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<p class="MsoNormal"><span style="font-size:10.0pt;font-family:"Arial",sans-serif;color:black"><o:p> </o:p></span></p>
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<p class="MsoNormal"><span style="font-size:10.0pt;font-family:"Arial",sans-serif;color:black">uiProcess == Project current uiProcess<o:p></o:p></span></p>
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<p class="MsoNormal"><span style="font-size:10.0pt;font-family:"Arial",sans-serif;color:black"><o:p> </o:p></span></p>
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<p class="MsoNormal"><span style="font-size:10.0pt;font-family:"Arial",sans-serif;color:black">because<o:p></o:p></span></p>
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<p class="MsoNormal"><span style="font-size:10.0pt;font-family:"Arial",sans-serif;color:black"><o:p> </o:p></span></p>
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<p class="MsoNormal"><span style="font-size:10.0pt;font-family:"Arial",sans-serif;color:black">uiProcess isActiveProcess<o:p></o:p></span></p>
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<p class="MsoNormal"><span style="font-size:10.0pt;font-family:"Arial",sans-serif;color:black"><o:p> </o:p></span></p>
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<p class="MsoNormal"><span style="font-size:10.0pt;font-family:"Arial",sans-serif;color:black">would always be true at that point.<o:p></o:p></span></p>
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<p class="MsoNormal"><span style="font-size:10.0pt;font-family:"Arial",sans-serif;color:black"><o:p> </o:p></span></p>
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<p class="MsoNormal"><span style="font-size:10.0pt;font-family:"Arial",sans-serif;color:black">Best,<o:p></o:p></span></p>
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<p class="MsoNormal"><span style="font-size:10.0pt;font-family:"Arial",sans-serif;color:black">Marcel<o:p></o:p></span></p>
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<p style="margin-top:7.5pt"><span style="font-size:10.0pt;font-family:"Arial",sans-serif;color:#AAAAAA">Am 06.07.2022 10:20:13 schrieb commits@source.squeak.org <commits@source.squeak.org>:<o:p></o:p></span></p>
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<span style="font-size:10.0pt;font-family:"Arial",sans-serif;color:black">A new version of Morphic was added to project The Inbox:<br>
http://source.squeak.org/inbox/Morphic-jar.2018.mcz<br>
<br>
==================== Summary ====================<br>
<br>
Name: Morphic-jar.2018<br>
Author: jar<br>
Time: 6 July 2022, 10:19:54.175389 am<br>
UUID: 78dd80d9-1174-0c40-ad18-6f76e13e744b<br>
Ancestors: Morphic-mt.2017<br>
<br>
Add an "exit condition" to the UI loop to allow a former UI process to finish its last cycle and terminate gracefully. It allows to create a new UI without the need to explicitely terminate the old one because a UI process will terminate automatically once
it's replaced by a new one. This change could allow UI proceses blocked on custom semaphores to continue waiting for a signal and finish their previous job (and terminate). Also, it prevents two UI processes to exist at the same time; only the one registered
in the 'uiProcess' variable is allowed to cycle.<br>
<br>
Please review for any potential drawbacks or conflicts I may have missed.<br>
<br>
=============== Diff against Morphic-mt.2017 ===============<br>
<br>
Item was changed:<br>
----- Method: MorphicProject>>spawnNewProcess (in category 'active process') -----<br>
spawnNewProcess<br>
<br>
uiProcess := [<br>
+ [world doOneCycle. Processor yield. uiProcess isActiveProcess] whileTrue.<br>
- [world doOneCycle. Processor yield ] repeat.<br>
] newProcess priority: Processor userSchedulingPriority.<br>
uiProcess resume!<br>
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<o:p></o:p></span></p>
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