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This is an automatically generated e-mail. To reply, visit:
<a href="https://reviewboard.asterisk.org/r/1900/">https://reviewboard.asterisk.org/r/1900/</a>
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<p style="margin-top: 0;">On May 4th, 2012, 11:37 p.m., <b>rmudgett</b> wrote:</p>
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<a href="https://reviewboard.asterisk.org/r/1900/diff/1/?file=27670#file27670line473" style="color: black; font-weight: bold; text-decoration: underline;">/trunk/main/cel.c</a>
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(Diff revision 1)
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<td colspan="4"><pre style="font-size: 8pt; line-height: 140%; margin: 0; ">struct ast_channel *ast_cel_fabricate_channel_from_event(const struct ast_event *event)</pre></td>
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<td bgcolor="#c5ffc4" width="50%"><pre style="font-size: 8pt; line-height: 140%; margin: 0; "><span class="kt">int</span> <span class="nf">ast_cel_linkedid_ref</span><span class="p">(</span><span class="k">const</span> <span class="kt">char</span> <span class="o">*</span><span class="n">linkedid</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 should exit early if the given linkedid is empty.</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;">Done.</pre>
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<p style="margin-top: 0;">On May 4th, 2012, 11:37 p.m., <b>rmudgett</b> wrote:</p>
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<a href="https://reviewboard.asterisk.org/r/1900/diff/1/?file=27671#file27671line651" style="color: black; font-weight: bold; text-decoration: underline;">/trunk/main/channel.c</a>
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(Diff revision 1)
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<td colspan="2"><pre style="font-size: 8pt; line-height: 140%; margin: 0; ">int ast_undestroyed_channels(void)</pre></td>
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<td bgcolor="#c5ffc4" width="50%"><pre style="font-size: 8pt; line-height: 140%; margin: 0; "> <span class="k">return</span> <span class="n">chancount</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 should be:
return ast_atomic_fetchadd_int(&chancount, 0);</pre>
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<p>On May 4th, 2012, 11:53 p.m., <b>rmudgett</b> wrote:</p>
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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;">Technically it should be using ast_atomic_fetchadd_int() to get a guaranteed consistent value but it isn't done anywhere else in Asterisk this way.</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;">Done.</pre>
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<p style="margin-top: 0;">On May 4th, 2012, 11:37 p.m., <b>rmudgett</b> wrote:</p>
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<a href="https://reviewboard.asterisk.org/r/1900/diff/1/?file=27671#file27671line6297" style="color: black; font-weight: bold; text-decoration: underline;">/trunk/main/channel.c</a>
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<td colspan="4"><pre style="font-size: 8pt; line-height: 140%; margin: 0; ">static const char *oldest_linkedid(const char *a, const char *b)</pre></td>
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<td bgcolor="#fdfebc" width="50%"><pre style="font-size: 8pt; line-height: 140%; margin: 0; "> <span class="k">if</span> <span class="p">(</span><span class="o"><span class="hl">!</span></span><span class="n">ast_strlen_zero</span><span class="p">(</span><span class="n">ast_channel_linkedid</span><span class="p">(</span><span class="n">chan</span><span class="p">))</span> <span class="o"><span class="hl">&&</span></span><span class="hl"> </span><span class="mi"><span class="hl">0</span></span><span class="hl"> </span><span class="o"><span class="hl">!=</span></span><span class="hl"> </span><span class="n">strcmp</span><span class="p">(</span><span class="n">ast_channel_linkedid</span><span class="p">(</span><span class="n">chan</span><span class="p">),</span> <span class="n">linkedid</span><span class="p">))</span> <span class="p">{</span></pre></td>
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<td bgcolor="#fdfebc" width="50%"><pre style="font-size: 8pt; line-height: 140%; margin: 0; "> <span class="k">if</span> <span class="p">(</span><span class="n">ast_strlen_zero</span><span class="p">(</span><span class="n">ast_channel_linkedid</span><span class="p">(</span><span class="n">chan</span><span class="p">))</span> <span class="o"><span class="hl">||</span></span><span class="hl"> </span><span class="o"><span class="hl">!</span></span><span class="n">strcmp</span><span class="p">(</span><span class="n">ast_channel_linkedid</span><span class="p">(</span><span class="n">chan</span><span class="p">),</span> <span class="n">linkedid</span><span class="p">))</span> <span class="p">{</span></pre></td>
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<td bgcolor="#fdfebc" width="50%"><pre style="font-size: 8pt; line-height: 140%; margin: 0; "> <span class="n">ast_cel_check_retire_linkedid</span><span class="p">(</span><span class="n">chan</span><span class="p">);</span></pre></td>
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<td bgcolor="#fdfebc" width="50%"><pre style="font-size: 8pt; line-height: 140%; margin: 0; "> <span class="k">return</span><span class="p">;</span></pre></td>
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<td bgcolor="#ffffff" width="50%"><pre style="font-size: 8pt; line-height: 140%; margin: 0; "> <span class="p">}</span></pre></td>
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<td bgcolor="#ffffff" width="50%"><pre style="font-size: 8pt; line-height: 140%; margin: 0; "> <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">ast_cel_check_retire_linkedid</span><span class="p">(</span><span class="n">chan</span><span class="p">);</span></pre></td>
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<td bgcolor="#ffffff" width="50%"><pre style="font-size: 8pt; line-height: 140%; margin: 0; "> <span class="n">ast_channel_linkedid_set</span><span class="p">(</span><span class="n">chan</span><span class="p">,</span> <span class="n">linkedid</span><span class="p">);</span></pre></td>
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<td bgcolor="#ffffff" width="50%"><pre style="font-size: 8pt; line-height: 140%; margin: 0; "> <span class="n">ast_channel_linkedid_set</span><span class="p">(</span><span class="n">chan</span><span class="p">,</span> <span class="n">linkedid</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">ast_cel_linkedid_ref</span><span class="p">(</span><span class="n">linkedid</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 code is not going to set a linkedid at all if the current linkedid is empty.
You should just remove the ast_strlen_zero check. With the ast_cel_linkedid_ref() doing nothing if linkedid is empty as indicated earlier.
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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;">Linkedids should *never* be empty after allocation. I'm assuming the check for ast_strlen_zero is there so that strcmp doesn't crash if for some reason ast_channel_linkedid(chan) returns NULL. This *should* never happen. But if it does, we probably shouldn't crash in production if we can avoid it.
We could just test for NULL, but "empty" would also be an error. We should really be testing both linkedid and ast_channel_linkedid(chan) for NULL before doing anything if we really wanted to be "safe". How about throwing in an ERROR message and an ast_assert()?</pre>
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<p>- Terry</p>
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<p>On May 7th, 2012, 9:10 a.m., Terry Wilson wrote:</p>
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<div>Review request for Asterisk Developers, Mark Michelson and rmudgett.</div>
<div>By Terry Wilson.</div>
<p style="color: grey;"><i>Updated May 7, 2012, 9:10 a.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 fixes to situations that could cause the CEL LINKEDID_END event to be missed.
1) During a core stop gracefully, modules are unloaded when ast_active_channels == 0. The LINKDEDID_END event fires during the channel destructor. This means that occasionally, the cel_* module will be unloaded before the channel is destroyed. It seemed generally useful to wait until the refcount of all channel == 0 before unloading, so I added a channel counter and used it in the shutdown code.
2) During a masquerade, ast_channel_change_linkedid is called. It calls ast_cel_check_retire_linkedid which unrefs the linkedid in the linkedids container in cel.c. It didn't ref the new linkedid. Now it does. I also changed the logic a little, since it used to call ast_channel_linkedid_set() even when it hadn't changed (or was blank, which should be verboten).
(this patch is against trunk, but it will go in 1.8+)</pre>
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<h1 style="color: #575012; font-size: 10pt; margin-top: 1.5em;">Testing </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;">My CEL test passed 100 times or so and transferred calls no longer show an error.</pre>
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<h1 style="color: #575012; font-size: 10pt; margin-top: 1.5em;">Diffs</b> </h1>
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<li>/trunk/include/asterisk/cel.h <span style="color: grey">(365451)</span></li>
<li>/trunk/include/asterisk/channel.h <span style="color: grey">(365451)</span></li>
<li>/trunk/main/asterisk.c <span style="color: grey">(365451)</span></li>
<li>/trunk/main/cel.c <span style="color: grey">(365451)</span></li>
<li>/trunk/main/channel.c <span style="color: grey">(365451)</span></li>
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<p><a href="https://reviewboard.asterisk.org/r/1900/diff/" style="margin-left: 3em;">View Diff</a></p>
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