'Review Request: fix callback race in the session saving and shutdown code'

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List:       kde-panel-devel
Subject:    Review Request: fix callback race in the session saving and shutdown code
From:       "Andriy Gapon" <avg () icyb ! net ! ua>
Date:       2012-05-31 8:48:05
Message-ID: 20120531084805.12119.81132 () vidsolbach ! de
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This is an automatically generated e-mail. To reply, visit:
http://git.reviewboard.kde.org/r/105111/
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Review request for Plasma.

Description
-------

This patch tries to a fix a race in the session saving and shutdown code of \
ksmserver. The race may happen on wmPhase1WaitingCount variable when WM-type clients \
are fast enough to complete their save requests while the loop in KSMServer::shutdown \
is still iterating.  As a result wmPhase1WaitingCount may become zero too early and \
that would kick off the next save/shutdown phase in a client's callback.  In fact, it \
might even go multiple times from zero to non-zero and back during the WM-specific \
loop.

This addresses bug 206511.
    http://bugs.kde.org/show_bug.cgi?id=206511

Diffs
-----

  ksmserver/shutdown.cpp a5a1ef9 

Diff: http://git.reviewboard.kde.org/r/105111/diff/

Testing
-------

Thanks,

Andriy Gapon

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      This is an automatically generated e-mail. To reply, visit:
      <a href="http://git.reviewboard.kde.org/r/105111/">http://git.reviewboard.kde.org/r/105111/</a>
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<div>Review request for Plasma.</div>
<div>By Andriy Gapon.</div>

<h1 style="color: #575012; font-size: 10pt; margin-top: 1.5em;">Description </h1>
 <table width="100%" bgcolor="#ffffff" cellspacing="0" cellpadding="10" \
style="border: 1px solid #b8b5a0">  <tr>
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   <pre style="margin: 0; padding: 0; white-space: pre-wrap; white-space: \
-moz-pre-wrap; white-space: -pre-wrap; white-space: -o-pre-wrap; word-wrap: \
break-word;">This patch tries to a fix a race in the session saving and shutdown code \
of ksmserver. The race may happen on wmPhase1WaitingCount variable when WM-type \
clients are fast enough to complete their save requests while the loop in \
KSMServer::shutdown is still iterating.  As a result wmPhase1WaitingCount may become \
zero too early and that would kick off the next save/shutdown phase in a client&#39;s \
callback.  In fact, it might even go multiple times from zero to non-zero and back \
during the WM-specific loop.</pre>  </td>
 </tr>
</table>

<div style="margin-top: 1.5em;">
 <b style="color: #575012; font-size: 10pt; margin-top: 1.5em;">Bugs: </b>

 <a href="http://bugs.kde.org/show_bug.cgi?id=206511">206511</a>

</div>

<h1 style="color: #575012; font-size: 10pt; margin-top: 1.5em;">Diffs</b> </h1>
<ul style="margin-left: 3em; padding-left: 0;">

 <li>ksmserver/shutdown.cpp <span style="color: grey">(a5a1ef9)</span></li>

</ul>

<p><a href="http://git.reviewboard.kde.org/r/105111/diff/" style="margin-left: \
3em;">View Diff</a></p>

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