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This is an automatically generated e-mail. To reply, visit:
<a href="http://git.reviewboard.kde.org/r/108407/">http://git.reviewboard.kde.org/r/108407/</a>
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<p style="margin-top: 0;">On January 14th, 2013, 2:37 p.m. CET, <b>Dario Freddi</b> wrote:</p>
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<a href="http://git.reviewboard.kde.org/r/108407/diff/3/?file=107206#file107206line66" style="color: black; font-weight: bold; text-decoration: underline;">powerdevil/daemon/backends/upower/login1suspendjob.cpp</a>
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(Diff revision 3)
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<td bgcolor="#c5ffc4" width="50%"><pre style="font-size: 8pt; line-height: 140%; margin: 0; "> <span class="k">case</span> <span class="n">PowerDevil</span>:<span class="o">:</span><span class="n">BackendInterface</span><span class="o">::</span><span class="n">ToRam</span><span class="o">:</span></pre></td>
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<td bgcolor="#c5ffc4" width="50%"><pre style="font-size: 8pt; line-height: 140%; margin: 0; "> <span class="n">reply</span> <span class="o">=</span> <span class="n">m_login1Interface</span><span class="o">-></span><span class="n">asyncCallWithArgumentList</span><span class="p">(</span><span class="s">"Suspend"</span><span class="p">,</span> <span class="n">args</span><span class="p">);</span></pre></td>
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<td bgcolor="#c5ffc4" width="50%"><pre style="font-size: 8pt; line-height: 140%; margin: 0; "> <span class="n">reply</span><span class="p">.</span><span class="n">waitForFinished</span><span class="p">();</span></pre></td>
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<td bgcolor="#c5ffc4" width="50%"><pre style="font-size: 8pt; line-height: 140%; margin: 0; "> <span class="k">break</span><span class="p">;</span></pre></td>
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<td bgcolor="#c5ffc4" width="50%"><pre style="font-size: 8pt; line-height: 140%; margin: 0; "> <span class="k">case</span> <span class="n">PowerDevil</span>:<span class="o">:</span><span class="n">BackendInterface</span><span class="o">::</span><span class="n">ToDisk</span><span class="o">:</span></pre></td>
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<td bgcolor="#c5ffc4" width="50%"><pre style="font-size: 8pt; line-height: 140%; margin: 0; "> <span class="n">reply</span> <span class="o">=</span> <span class="n">m_login1Interface</span><span class="o">-></span><span class="n">asyncCallWithArgumentList</span><span class="p">(</span><span class="s">"Hibernate"</span><span class="p">,</span> <span class="n">args</span><span class="p">);</span></pre></td>
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<td bgcolor="#c5ffc4" width="50%"><pre style="font-size: 8pt; line-height: 140%; margin: 0; "> <span class="n">reply</span><span class="p">.</span><span class="n">waitForFinished</span><span class="p">();</span></pre></td>
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<td bgcolor="#c5ffc4" width="50%"><pre style="font-size: 8pt; line-height: 140%; margin: 0; "> <span class="k">break</span><span class="p">;</span></pre></td>
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<td bgcolor="#c5ffc4" width="50%"><pre style="font-size: 8pt; line-height: 140%; margin: 0; "> <span class="k">case</span> <span class="n">PowerDevil</span>:<span class="o">:</span><span class="n">BackendInterface</span><span class="o">::</span><span class="n">HybridSuspend</span><span class="o">:</span></pre></td>
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<td bgcolor="#c5ffc4" width="50%"><pre style="font-size: 8pt; line-height: 140%; margin: 0; "> <span class="n">reply</span> <span class="o">=</span> <span class="n">m_login1Interface</span><span class="o">-></span><span class="n">asyncCallWithArgumentList</span><span class="p">(</span><span class="s">"HybridSleep"</span><span class="p">,</span> <span class="n">args</span><span class="p">);</span></pre></td>
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<td bgcolor="#c5ffc4" width="50%"><pre style="font-size: 8pt; line-height: 140%; margin: 0; "> <span class="n">reply</span><span class="p">.</span><span class="n">waitForFinished</span><span class="p">();</span></pre></td>
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<td bgcolor="#c5ffc4" width="50%"><pre style="font-size: 8pt; line-height: 140%; margin: 0; "> <span class="k">break</span><span class="p">;</span></pre></td>
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<pre style="white-space: pre-wrap; white-space: -moz-pre-wrap; white-space: -pre-wrap; white-space: -o-pre-wrap; word-wrap: break-word;">This, instead, should be really handled in a fully asynchronous way. We had deadlocking problems in similar situations before, and I can see the same problems potentially arising here, especially because I don't know how the call is internally handled in systemd and when it returns.
Moreover, giving it a second look, there is another thing: you are emitting the result without any kind of error checking. Is that intentional, as in: is there a way to check such a thing? And moreover: do you need to have the job return when the call finishes?
This for two reasons: if you just need the job merely to start the call, then a KJob is definitely overkill, since the operation is already asynchronous through the bus. OTOH, if you need such a thing, you are processing the whole thing synchronously and not reporting a potential error, defying the purpose of a KJob at all. Depending on what you need to do, I'd rather either make the job truly async or not have it as a KJob at all.
If you don't have a way to detect errors but need to have the job return when the operation ends, a mere connect(QDBusWatcher, SIGNAL(finished()), SLOT(emitFinished())) would do.</pre>
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<pre style="margin-left: 1em; white-space: pre-wrap; white-space: -moz-pre-wrap; white-space: -pre-wrap; white-space: -o-pre-wrap; word-wrap: break-word;">I think just emitting the signal will do fine, the login1 calls (Suspend, Hibernate, etc) return no value anyway</pre>
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<p>- Lukáš</p>
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<p>On January 14th, 2013, 2:22 p.m. CET, Lukáš Tinkl wrote:</p>
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<div>Review request for Solid and Dario Freddi.</div>
<div>By Lukáš Tinkl.</div>
<p style="color: grey;"><i>Updated Jan. 14, 2013, 2:22 p.m.</i></p>
<h1 style="color: #575012; font-size: 10pt; margin-top: 1.5em;">Description </h1>
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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 adds support for systemd-login1 service to Powerdevil's upower backend. The main purpose is that UPower will be soon dropping support[1] for suspend/resume features so we have to rely on systemd. With this login1, we are also gaining support for HybridSleep, where implemented by the system.
One caveat: the current login1 implementation doesn't support[2] emitting the "resume from suspend" signal
[1] http://lists.freedesktop.org/archives/devkit-devel/2013-January/001339.html
[2] http://www.freedesktop.org/wiki/Software/systemd/inhibit</pre>
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<b style="color: #575012; font-size: 10pt; margin-top: 1.5em;">Bugs: </b>
<a href="http://bugs.kde.org/show_bug.cgi?id=https://bugzilla.redhat.com/show_bug.cgi?id=859227">https://bugzilla.redhat.com/show_bug.cgi?id=859227</a>
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<h1 style="color: #575012; font-size: 10pt; margin-top: 1.5em;">Diffs</b> </h1>
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<li>powerdevil/daemon/BackendConfig.cmake <span style="color: grey">(5dbe6f6)</span></li>
<li>powerdevil/daemon/backends/upower/login1suspendjob.h <span style="color: grey">(PRE-CREATION)</span></li>
<li>powerdevil/daemon/backends/upower/login1suspendjob.cpp <span style="color: grey">(PRE-CREATION)</span></li>
<li>powerdevil/daemon/backends/upower/powerdevilupowerbackend.h <span style="color: grey">(ba942bd)</span></li>
<li>powerdevil/daemon/backends/upower/powerdevilupowerbackend.cpp <span style="color: grey">(97a409b)</span></li>
<li>powerdevil/daemon/backends/upower/upowersuspendjob.h <span style="color: grey">(bbe2f45)</span></li>
<li>powerdevil/daemon/backends/upower/upowersuspendjob.cpp <span style="color: grey">(fa64ab0)</span></li>
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<p><a href="http://git.reviewboard.kde.org/r/108407/diff/" style="margin-left: 3em;">View Diff</a></p>
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