<html xmlns:v="urn:schemas-microsoft-com:vml" xmlns:o="urn:schemas-microsoft-com:office:office" xmlns:w="urn:schemas-microsoft-com:office:word" xmlns:m="http://schemas.microsoft.com/office/2004/12/omml" xmlns="http://www.w3.org/TR/REC-html40">
<head>
<meta http-equiv="Content-Type" content="text/html; charset=us-ascii">
<meta name="Generator" content="Microsoft Word 12 (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:Webdings;
panose-1:5 3 1 2 1 5 9 6 7 3;}
@font-face
{font-family:Verdana;
panose-1:2 11 6 4 3 5 4 4 2 4;}
/* Style Definitions */
p.MsoNormal, li.MsoNormal, div.MsoNormal
{margin:0cm;
margin-bottom:.0001pt;
font-size:11.0pt;
font-family:"Calibri","sans-serif";}
a:link, span.MsoHyperlink
{mso-style-priority:99;
color:blue;
text-decoration:underline;}
a:visited, span.MsoHyperlinkFollowed
{mso-style-priority:99;
color:purple;
text-decoration:underline;}
span.EmailStyle17
{mso-style-type:personal-compose;
font-family:"Calibri","sans-serif";
color:windowtext;}
span.apple-converted-space
{mso-style-name:apple-converted-space;}
.MsoChpDefault
{mso-style-type:export-only;}
@page WordSection1
{size:612.0pt 792.0pt;
margin:72.0pt 72.0pt 72.0pt 72.0pt;}
div.WordSection1
{page:WordSection1;}
--></style><!--[if gte mso 9]><xml>
<o:shapedefaults v:ext="edit" spidmax="1026" />
</xml><![endif]--><!--[if gte mso 9]><xml>
<o:shapelayout v:ext="edit">
<o:idmap v:ext="edit" data="1" />
</o:shapelayout></xml><![endif]-->
</head>
<body lang="EN-GB" link="blue" vlink="purple">
<div class="WordSection1">
<p class="MsoNormal">Is anyone able to confirm that QDBusAbstractInterface::call() is re-entrant by the Qt definition of re-entrancy?<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">The documentation of the class does not explicitly say (with the exception of QDBusAbstractInterface::asyncCallWithArgumentList(), which is threadsafe) and the Qt documentation on thread safety / re-entrancy is a little unclear since:<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal"><i>“</i><i><span style="font-size:9.0pt;font-family:"Verdana","sans-serif";color:#363534;background:white">a class is said to be<span class="apple-converted-space"> </span>reentrant<span class="apple-converted-space"> </span>if its member
functions can be called safely from multiple threads, as long as each thread uses a<span class="apple-converted-space"> </span>different<span class="apple-converted-space"> </span>instance of the class.”</span><o:p></o:p></i></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">Which, if combined with the later stated:<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal"><i>“</i><i><span style="font-size:9.0pt;font-family:"Verdana","sans-serif";color:#363534;background:white">If a class is not marked as thread-safe or reentrant then a specific instance of that class should not be accessed from different
threads.</span>”<o:p></o:p></i></p>
<p class="MsoNormal"><i><o:p> </o:p></i></p>
<p class="MsoNormal">Would seem to suggest that by default, if a class is not marked as thread safe or re-entrant it is implicitly re-entrant, but this sounds like a dangerous assumption to me.<o:p></o:p></p>
<p class="MsoNormal">--<o:p></o:p></p>
<p class="MsoNormal"><b><span lang="EN-US" style="font-size:10.0pt;font-family:"Arial","sans-serif"">Nick Ogden<o:p></o:p></span></b></p>
<p class="MsoNormal"><span lang="EN-US" style="font-size:10.0pt;font-family:"Arial","sans-serif"">Software Engineer<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US" style="font-size:10.0pt;font-family:"Arial","sans-serif"">G4S Technology Ltd.<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US" style="font-size:10.0pt;font-family:"Arial","sans-serif""><o:p> </o:p></span></p>
<p class="MsoNormal"><span lang="EN-US" style="font-size:10.0pt;font-family:"Arial","sans-serif""><a href="mailto:nick.ogden@g4tec.com"><span style="color:blue">nick.ogden@g4tec.com</span></a><o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US" style="font-size:10.0pt;font-family:"Arial","sans-serif""><a href="http://www.g4stechnology.com/"><span style="color:blue">www.g4stechnology.com</span></a><o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US" style="font-size:10.0pt;font-family:"Arial","sans-serif"">Challenge House,<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US" style="font-size:10.0pt;font-family:"Arial","sans-serif"">International Drive,<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US" style="font-size:10.0pt;font-family:"Arial","sans-serif"">Tewkesbury,<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US" style="font-size:10.0pt;font-family:"Arial","sans-serif"">Gloucestershire,<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US" style="font-size:10.0pt;font-family:"Arial","sans-serif"">GL20 8UQ, UK<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US" style="font-size:10.0pt;font-family:"Arial","sans-serif""><o:p> </o:p></span></p>
<p class="MsoNormal"><b><span lang="EN-US" style="font-size:10.0pt;font-family:Webdings;color:#00B050">P
</span></b><b><span lang="EN-US" style="font-size:10.0pt;font-family:"Arial","sans-serif";color:#00B050">Please consider the environment before printing this email<o:p></o:p></span></b></p>
<p class="MsoNormal"><o:p> </o:p></p>
</div>
<br>
<hr>
<font face="Arial" color="Gray" size="1">The details of this company are as follows:<br>
G4S Technology Limited, Registered Office: Challenge House, International Drive, Tewkesbury, Gloucestershire GL20 8UQ, Registered in England No. 2382338.<br>
<br>
This communication may contain information which is confidential, personal and/or privileged.<br>
<br>
It is for the exclusive use of the intended recipient(s).<br>
If you are not the intended recipient(s), please note that any distribution, forwarding, copying or use of this communication or the information in it is strictly prohibited.<br>
<br>
Any personal views expressed in this e-mail are those of the individual sender and the company does not endorse or accept responsibility for them.<br>
<br>
Prior to taking any action based upon this e-mail message, you should seek appropriate confirmation of its authenticity.<br>
<br>
This e-mail has been scanned for all viruses by MessageLabs.<br>
</font>
</body>
</html>