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This is an automatically generated e-mail. To reply, visit:
<a href="https://reviewboard.asterisk.org/r/2536/">https://reviewboard.asterisk.org/r/2536/</a>
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<p style="margin-top: 0;">On May 14th, 2013, 10:56 p.m. UTC, <b>Mark Michelson</b> wrote:</p>
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<a href="https://reviewboard.asterisk.org/r/2536/diff/1/?file=37843#file37843line3216" style="color: black; font-weight: bold; text-decoration: underline;">/team/mmichelson/more_transfer/channels/chan_mgcp.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; ">static int attempt_transfer(struct mgcp_endpoint *p)</pre></td>
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<td bgcolor="#fdfebc" width="50%"><pre style="font-size: 8pt; line-height: 140%; margin: 0; "><span class="k">static</span> <span class="kt">int</span> <span class="nf">attempt_transfer</span><span class="p">(</span><span class="k">struct</span> <span class="n">mgcp_endpoint</span> <span class="o">*</span><span class="n">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">static</span> <span class="kt">int</span> <span class="nf">attempt_transfer</span><span class="p">(</span><span class="k">struct</span> <span class="n">mgcp_endpoint</span> <span class="o">*</span><span class="n">p</span><span class="p"><span class="hl">,</span></span><span class="hl"> </span><span class="k"><span class="hl">struct</span></span><span class="hl"> </span><span class="n"><span class="hl">mgcp_subchannel</span></span><span class="hl"> </span><span class="o"><span class="hl">*</span></span><span class="n"><span class="hl">sub</span></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;">Since you have taken the time to unravel the mysteries behind MGCP's transfers, please please please add some doxygen to this particular function. Focus on
1) What the different parties are (p->sub, p->sub->next, sub, and sub->next)
2) What the different return values mean.
As it is, this is incredibly difficult to understand, especially the return values. Looking at how the return of attempt_transfer() is handled doesn't really help matters any.</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've added a bit more documentation but to truly understand this would require writing a lot about sub-channels, what they are, what they mean, and how they work. That is really what makes this complicated.</pre>
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<p style="margin-top: 0;">On May 14th, 2013, 10:56 p.m. UTC, <b>Mark Michelson</b> wrote:</p>
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<a href="https://reviewboard.asterisk.org/r/2536/diff/1/?file=37843#file37843line3272" style="color: black; font-weight: bold; text-decoration: underline;">/team/mmichelson/more_transfer/channels/chan_mgcp.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; ">static int attempt_transfer(struct mgcp_endpoint *p)</pre></td>
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<td bgcolor="#c5ffc4" width="50%"><pre style="font-size: 8pt; line-height: 140%; margin: 0; "><span class="tb"> </span><span class="k">if</span> <span class="p">(</span><span class="n">p</span><span class="o">-></span><span class="n">sub</span> <span class="o">!=</span> <span class="n">sub</span><span class="p">)</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="tb"> </span><span class="tb"> </span><span class="n">p</span><span class="o">-></span><span class="n">sub</span> <span class="o">=</span> <span class="n">sub</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="tb"> </span><span class="tb"> </span><span class="n">unalloc_sub</span><span class="p">(</span><span class="n">sub</span><span class="o">-></span><span class="n">next</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="tb"> </span><span class="tb"> </span><span class="k">return</span> <span class="mi">1</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="tb"> </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="tb"> </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; "></pre></td>
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<td bgcolor="#c5ffc4" width="50%"><pre style="font-size: 8pt; line-height: 140%; margin: 0; "><span class="tb"> </span><span class="n">unalloc_sub</span><span class="p">(</span><span class="n">sub</span><span class="o">-></span><span class="n">next</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;">Since sub->next is unalloced no matter what, could you do this:
unalloc_sub(sub->next);
if (p->sub != sub) {
p->sub = sub;
return 1;
}
return 0;
Or would that ordering mess things up?</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;">It *should* be okay.</pre>
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<p>- Joshua</p>
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<p>On May 14th, 2013, 3:21 p.m. UTC, Joshua Colp wrote:</p>
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<div>Review request for Asterisk Developers and Mark Michelson.</div>
<div>By Joshua Colp.</div>
<p style="color: grey;"><i>Updated May 14, 2013, 3:21 p.m.</i></p>
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<b style="color: #575012; font-size: 10pt;">Repository: </b>
Asterisk
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<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 change cleans up the MGCP transfer code a bit, moves it to the new attended transfer API, and adds a few comments.</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;">I wish.</pre>
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<h1 style="color: #575012; font-size: 10pt; margin-top: 1.5em;">Diffs</b> </h1>
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<li>/team/mmichelson/more_transfer/channels/chan_mgcp.c <span style="color: grey">(388687)</span></li>
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<p><a href="https://reviewboard.asterisk.org/r/2536/diff/" style="margin-left: 3em;">View Diff</a></p>
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