<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
<html>
  <head>
    <meta content="text/html; charset=windows-1252"
      http-equiv="Content-Type">
    <title></title>
  </head>
  <body bgcolor="#ffffff" text="#000000">
    Hi Jaromir,<br>
    <br>
    You are right, and your code is safer.<br>
    <br>
    But I don't think this problem grants adding a class variable to
    SystemDictionary. I just pushed an update that calls
    #valueUnpreemptively instead.<br>
    <br>
    Thanks,<br>
    <br>
    On 7/9/2022 8:17 AM, Jaromir Matas via Cuis-dev wrote:
    <blockquote
cite="mid:BYAPR03MB407293F7FE33CC2E73E8F1A5EE859@BYAPR03MB4072.namprd03.prod.outlook.com"
      type="cite">
      <meta http-equiv="Content-Type" content="text/html;
        charset=windows-1252">
      <meta name="Generator" content="Microsoft Word 15 (filtered
        medium)">
      <style><!--
/* Font Definitions */
@font-face
        {font-family:"Cambria Math";
        panose-1:2 4 5 3 5 4 6 3 2 4;}
@font-face
        {font-family:Calibri;
        panose-1:2 15 5 2 2 2 4 3 2 4;}
@font-face
        {font-family:"Calibri Light";
        panose-1:2 15 3 2 2 2 4 3 2 4;}
/* Style Definitions */
p.MsoNormal, li.MsoNormal, div.MsoNormal
        {margin:0in;
        font-size:11.0pt;
        font-family:"Calibri",sans-serif;}
a:link, span.MsoHyperlink
        {mso-style-priority:99;
        color:blue;
        text-decoration:underline;}
pre
        {mso-style-priority:99;
        mso-style-link:"HTML Preformatted Char";
        margin:0in;
        margin-bottom:.0001pt;
        font-size:10.0pt;
        font-family:"Courier New";
        color:black;}
p.MsoNoSpacing, li.MsoNoSpacing, div.MsoNoSpacing
        {mso-style-priority:1;
        margin:0in;
        font-size:11.0pt;
        font-family:"Calibri",sans-serif;}
span.HTMLPreformattedChar
        {mso-style-name:"HTML Preformatted Char";
        mso-style-priority:99;
        mso-style-link:"HTML Preformatted";
        font-family:"Courier New";
        color:black;}
.MsoChpDefault
        {mso-style-type:export-only;}
@page WordSection1
        {size:8.5in 11.0in;
        margin:1.0in 1.0in 1.0in 1.0in;}
div.WordSection1
        {page:WordSection1;}
--></style>
      <div class="WordSection1">
        <p class="MsoNormal">Hi Juan,</p>
        <p class="MsoNormal"><o:p> </o:p></p>
        <p class="MsoNormal">I’ve stumbled upon this irregularity:</p>
        <p class="MsoNormal"><o:p> </o:p></p>
        <p class="MsoNormal">If you run this in the Workspace…</p>
        <p class="MsoNormal"><o:p> </o:p></p>
        <p class="MsoNormal">[Smalltalk installLowSpaceWatcher] fork.</p>
        <p class="MsoNormal">[Smalltalk installLowSpaceWatcher] fork</p>
        <p class="MsoNormal"><o:p> </o:p></p>
        <p class="MsoNormal">… the system ends up with two processes
          running the #lowSpaceWatcher method; the root cause is
          #installLowSpaceWatcher runs unprotected against multiple
          concurrent invocations.</p>
        <p class="MsoNormal"><o:p> </o:p></p>
        <p class="MsoNormal">I’d suggest running the #
          installLowSpaceWatcher’s code as the Semaphore >>
          #critical section: see attached changeset with a more detailed
          description in the method comment. Please feel free to modify
          in any way :)</p>
        <p class="MsoNormal"><o:p> </o:p></p>
        <p class="MsoNormal">Thanks for your opinion,</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><br>
        </p>
      </div>
    </blockquote>
    <br>
    <pre class="moz-signature" cols="72">-- 
Juan Vuletich
<a class="moz-txt-link-abbreviated" href="http://www.cuis-smalltalk.org">www.cuis-smalltalk.org</a>
<a class="moz-txt-link-freetext" href="https://github.com/Cuis-Smalltalk/Cuis-Smalltalk-Dev">https://github.com/Cuis-Smalltalk/Cuis-Smalltalk-Dev</a>
<a class="moz-txt-link-freetext" href="https://github.com/jvuletich">https://github.com/jvuletich</a>
<a class="moz-txt-link-freetext" href="https://www.linkedin.com/in/juan-vuletich-75611b3">https://www.linkedin.com/in/juan-vuletich-75611b3</a>
<a class="moz-txt-link-freetext" href="https://independent.academia.edu/JuanVuletich">https://independent.academia.edu/JuanVuletich</a>
<a class="moz-txt-link-freetext" href="https://www.researchgate.net/profile/Juan-Vuletich">https://www.researchgate.net/profile/Juan-Vuletich</a>
<a class="moz-txt-link-freetext" href="https://patents.justia.com/inventor/juan-manuel-vuletich">https://patents.justia.com/inventor/juan-manuel-vuletich</a>
<a class="moz-txt-link-freetext" href="https://twitter.com/JuanVuletich">https://twitter.com/JuanVuletich</a></pre>
  </body>
</html>