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Hi Jaromir,<br>
<br>
I think it is fair to say that if the debugger needs to open, there
must be a runnable UI process. Just pushed #5347 for that.<br>
<br>
I just think that nobody in the Cuis / Squeak community thought
about that before.<br>
<br>
Thanks!!!<br>
<br>
Cheers,<br>
<br>
On 7/2/2022 6:03 AM, Jaromir Matas via Cuis-dev wrote:
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<p class="MsoNormal">Hi Juan,</p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">the update indeed works, thanks! </p>
<p class="MsoNormal">An observation though: if you do:</p>
<p class="MsoNormal">1) Semaphore new wait</p>
<p class="MsoNormal">2) Alt+.</p>
<p class="MsoNormal">3) Proceed</p>
<p class="MsoNormal">It disrupts the screen and 'restore
display' from the World menu is needed; nothing serious, just
reporting because I don't know whether this is to be expected
or not :)</p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">There's one issue I'd very much like to
discuss:</p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">s := Semaphore new.</p>
<p class="MsoNormal">[1/0. s signal] fork.</p>
<p class="MsoNormal">s wait</p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">When I first ran this example I kind of
hoped the UI would not freeze and would open a debugger on the
ZeroDivide. I can't see any reason why not behave like that
but both Squeak and Cuis freeze because the UI waits on the
semaphore and the forked process requests the UI to open a
debugger but the UI is stuck at the semaphore :)</p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">My expectation was the system would spawn a
new UI that would open the debugger but I have no experience
with UIs and debuggers and can imagine it may be very tricky
:)</p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">I'd be very interested in your opinion how
the above example could/should be handled by the UI.</p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">Of course if you run the example in a
non-UI process it works as expected but it'd be nice I guess
if running it in the UI would behave similarly :)</p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">[s := Semaphore new.</p>
<p class="MsoNormal">[1/0. s signal] fork.</p>
<p class="MsoNormal">s wait] fork</p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">Many thanks!</p>
<p class="MsoNormal">Jaromir</p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNoSpacing"><span lang="CS">--</span></p>
<p class="MsoNoSpacing"><strong><span style="font-family:
"Calibri Light",sans-serif; color: rgb(51, 51,
51); font-weight: normal;">Jaromír Matas</span></strong><span
style="font-family: "Calibri Light",sans-serif;
color: rgb(85, 85, 85);"><o:p></o:p></span></p>
<p class="MsoNoSpacing"><span style="font-family: "Calibri
Light",sans-serif; color: rgb(46, 117, 182);"><a class="moz-txt-link-abbreviated" href="mailto:mail@jaromir.net">mail@jaromir.net</a></span></p>
<p class="MsoNormal"><o:p> </o:p></p>
<div style="border-right: medium none; border-width: 1pt medium
medium; border-style: solid none none; border-color: rgb(225,
225, 225) -moz-use-text-color -moz-use-text-color; padding:
3pt 0in 0in;">
<p class="MsoNormal" style="border: medium none; padding:
0in;"><b>From: </b><a moz-do-not-send="true"
href="mailto:JuanVuletich@zoho.com">Juan Vuletich</a><br>
<b>Sent: </b>Saturday, July 2, 2022 1:54<br>
<b>To: </b><a moz-do-not-send="true"
href="mailto:cuis-dev@lists.cuis.st">Discussion of Cuis
Smalltalk</a><br>
<b>Cc: </b><a moz-do-not-send="true"
href="mailto:JuanVuletich@zoho.com">Juan Vuletich</a>; <a
moz-do-not-send="true" href="mailto:mail@jaromir.net">
Jaromir Matas</a><br>
<b>Subject: </b>Re: [Cuis-dev] Freezing UI - can't
interrupt via Alt+.</p>
</div>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal"><span style="color: black;">On 7/1/2022
9:45 AM, Juan Vuletich via Cuis-dev wrote:
<o:p></o:p></span></p>
<blockquote style="margin-top: 5pt; margin-bottom: 5pt;">
<p class="MsoNormal"><span style="color: black;">On 7/1/2022
8:17 AM, Jaromir Matas via Cuis-dev wrote:
<o:p></o:p></span></p>
<blockquote style="margin-top: 5pt; margin-bottom: 5pt;">
<p class="MsoNormal"><span style="color: black;">Hi Juan,
all,<o:p></o:p></span></p>
<p class="MsoNormal"><span style="color: black;"> <o:p></o:p></span></p>
<p class="MsoNormal"><span style="color: black;">I wonder
why this can’t be interrupted by Alt+.<o:p></o:p></span></p>
<p class="MsoNormal"><span style="color: black;"> <o:p></o:p></span></p>
<p class="MsoNormal"><span style="color: black;">Semaphore
new wait<o:p></o:p></span></p>
<p class="MsoNormal"><span style="color: black;"> <o:p></o:p></span></p>
<p class="MsoNormal"><span style="color: black;">The system
returns a message “Can not interrupt background process”
and the image has to be closed.<o:p></o:p></span></p>
<p class="MsoNormal"><span style="color: black;"> <o:p></o:p></span></p>
<p class="MsoNormal"><span style="color: black;">The same
happens in this case:<o:p></o:p></span></p>
<p class="MsoNormal"><span style="color: black;"> <o:p></o:p></span></p>
<p class="MsoNormal"><span style="color: black;">s :=
Semaphore new.<o:p></o:p></span></p>
<p class="MsoNormal"><span style="color: black;">[1/0. s
signal] fork.<o:p></o:p></span></p>
<p class="MsoNormal"><span style="color: black;">s wait<o:p></o:p></span></p>
<p class="MsoNormal"><span style="color: black;"> <o:p></o:p></span></p>
<p class="MsoNormal"><span style="color: black;">It not only
freezes the UI but is not even recoverable…<o:p></o:p></span></p>
<p class="MsoNormal"><span style="color: black;"> <o:p></o:p></span></p>
<p class="MsoNormal"><span style="color: black;">Thanks,<o:p></o:p></span></p>
<p class="MsoNormal"><span style="color: black;">jaromir<o:p></o:p></span></p>
<p class="MsoNormal"><span style="color: black;"> <o:p></o:p></span></p>
<p class="MsoNoSpacing"><span style="color: black;"
lang="CS">--</span><span style="color: black;"><o:p></o:p></span></p>
<p class="MsoNoSpacing"><strong><span style="font-family:
"Calibri Light",sans-serif; font-weight:
normal;">Jaromír Matas</span></strong><span
style="color: black;"><o:p></o:p></span></p>
<p class="MsoNoSpacing"><a moz-do-not-send="true"
href="mailto:mail@jaromir.net">mail@jaromir.net</a><span
style="color: black;"><o:p></o:p></span></p>
<p class="MsoNormal"><span style="color: black;"> <o:p></o:p></span></p>
</blockquote>
<p class="MsoNormal"><span style="color: black;"><br>
Hi Jaromir,<br>
<br>
The problem is in #handleUserInterrupt, in particular in
#processTakingMostCPU. #handleUserInterrupt runs on a high
priority process, so the first thing it needs to figure
out is which process to interrupt. I wrote that code
believing that alt+. would need to interrupt busy code,
and it works in that case. It doesn't work if the UI
process is waiting and never resumed, as it is not "busy".<br>
<br>
We need to do better here. I won't be able to work on this
for the next few days, but would be very happy if any of
you folks suggest / code a solution.<br>
<br>
Thanks,<br>
<br>
<o:p></o:p></span></p>
<pre>-- </pre>
<pre>Juan Vuletich</pre>
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</blockquote>
<p class="MsoNormal"><span style="color: black;"><br>
Just pushed a fix. Please review it. It is update #5346.<br>
<br>
Thanks!<br>
<br>
<o:p></o:p></span></p>
<pre>-- </pre>
<pre>Juan Vuletich</pre>
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<p class="MsoNormal"><span style="font-size: 10pt; font-family:
"Courier New"; color: black;"><o:p> </o:p></span></p>
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<br>
<br>
<pre class="moz-signature" cols="72">--
Juan Vuletich
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