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This is an automatically generated e-mail. To reply, visit:
<a href="https://reviewboard.asterisk.org/r/2756/">https://reviewboard.asterisk.org/r/2756/</a>
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<p style="margin-top: 0;">On August 13th, 2013, 11:28 a.m. CDT, <b>Mark Michelson</b> wrote:</p>
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<a href="https://reviewboard.asterisk.org/r/2756/diff/2/?file=43976#file43976line26465" style="color: black; font-weight: bold; text-decoration: underline;">trunk/channels/chan_sip.c</a>
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(Diff revision 2)
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<td colspan="4"><pre style="font-size: 8pt; line-height: 140%; margin: 0; ">static int handle_request_bye(struct sip_pvt *p, struct sip_request *req)</pre></td>
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<td bgcolor="#fdfebc" width="50%"><pre style="font-size: 8pt; line-height: 140%; margin: 0; "><span class="tb"> </span><span class="tb"> </span>if (<span class="hl">bridge</span>) {</pre></td>
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<td bgcolor="#fdfebc" width="50%"><pre style="font-size: 8pt; line-height: 140%; margin: 0; "><span class="tb"> </span><span class="tb"> </span>if (<span class="hl">peer_channel</span>) {</pre></td>
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<td bgcolor="#fdfebc" width="50%"><pre style="font-size: 8pt; line-height: 140%; margin: 0; "><span class="tb"> </span><span class="tb"> </span><span class="tb"> </span>struct sip_pvt *q = ast_channel_tech_pvt(<span class="hl">bridge</span>);</pre></td>
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<td bgcolor="#fdfebc" width="50%"><pre style="font-size: 8pt; line-height: 140%; margin: 0; "><span class="tb"> </span><span class="tb"> </span><span class="tb"> </span>struct sip_pvt *q = ast_channel_tech_pvt(<span class="hl">peer_channel</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="tb"> </span>RAII_VAR(struct ast_channel *, owner_relock, NULL, ast_channel_cleanup);</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="tb"> </span>RAII_VAR(struct ast_channel *, owner_ref, NULL, ast_channel_cleanup);</pre></td>
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<td bgcolor="#fdfebc" width="50%"><pre style="font-size: 8pt; line-height: 140%; margin: 0; "><span class="tb"> </span><span class="tb"> </span><span class="tb"> </span>if (IS_SIP_TECH(ast_channel_tech(bridge)) && q && q->rtp) {</pre></td>
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<td bgcolor="#fdfebc" width="50%"><pre style="font-size: 8pt; line-height: 140%; margin: 0; "><span class="tb"> </span><span class="tb"> </span><span class="tb"> </span>/* Grab a reference to p->owner to prevent it from going away */</pre></td>
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<td bgcolor="#fdfebc" width="50%"><pre style="font-size: 8pt; line-height: 140%; margin: 0; "><span class="tb"> </span><span class="tb"> </span><span class="tb"> </span><span class="tb"> </span>ast_rtp_instance_set_stats_vars(bridge, q->rtp);</pre></td>
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<td bgcolor="#fdfebc" width="50%"><pre style="font-size: 8pt; line-height: 140%; margin: 0; "><span class="tb"> </span><span class="tb"> </span><span class="tb"> </span>owner_ref = ast_channel_ref(p->owner);</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="tb"> </span>/* Established locking order here is bridge, channel, pvt</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="tb"> </span> * and the bridge and channel will be locked during</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="tb"> </span> * ast_rtp_instance_set_stats_vars. p->owner must not be</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="tb"> </span> * held to avoid deadlocks. */</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="tb"> </span>ast_channel_unlock(owner_ref);</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="tb"> </span>sip_pvt_unlock(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="tb"> </span><span class="tb"> </span>if (IS_SIP_TECH(ast_channel_tech(peer_channel)) && q && q->rtp) {</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="tb"> </span><span class="tb"> </span>ast_rtp_instance_set_stats_vars(peer_channel, q->rtp);</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="tb"> </span>owner_relock = sip_pvt_lock_full(p);</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;">I'm not really seeing the point of this block of code. Since ast_rtp_instance_set_stats_vars() affects both the passed-in channel and the bridged peer, this seems to just be re-doing what the previous call did.</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;">ast_rtp_instance_set_stats_vars() does slightly different things to the channel versus the bridged channel with the bridged channel getting variables set on it with the BRIDGED suffix. Running it on each channel ensures that both channels get a copy of each set of variables (one for itself and one for the bridged channel). I will shuffle things around a bit to reduce the number of lock dances that must be performed.</pre>
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<p>- opticron</p>
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<p>On August 12th, 2013, 4:18 p.m. CDT, opticron wrote:</p>
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<div>Review request for Asterisk Developers and Mark Michelson.</div>
<div>By opticron.</div>
<p style="color: grey;"><i>Updated Aug. 12, 2013, 4:18 p.m.</i></p>
<div style="margin-top: 1.5em;">
<b style="color: #575012; font-size: 10pt; margin-top: 1.5em;">Bugs: </b>
<a href="https://issues.asterisk.org/jira/browse/ASTERISK-22215">ASTERISK-22215</a>
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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 resolves several deadlocks in chan_sip relating to usage of ast_channel_bridge_peer and improves accessibility of lock debugging function calls.
These issues were found while fixing the sip attended transfer integration tests for the referenced bug.</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;">With these changes, chan_sip no longer stalls part of the way through the rewritten sip attended transfer tests on the REFER or at the end on the final BYE.</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/channels/chan_sip.c <span style="color: grey">(396504)</span></li>
<li>trunk/include/asterisk/lock.h <span style="color: grey">(396504)</span></li>
<li>trunk/main/utils.c <span style="color: grey">(396504)</span></li>
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<p><a href="https://reviewboard.asterisk.org/r/2756/diff/" style="margin-left: 3em;">View Diff</a></p>
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