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<a href="https://reviewboard.asterisk.org/r/1708/diff/3/?file=23869#file23869line561" style="color: black; font-weight: bold; text-decoration: underline;">/branches/1.8/channels/chan_agent.c</a>
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(Diff revision 3)
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<td colspan="4"><pre style="font-size: 8pt; line-height: 140%; margin: 0; ">static int agent_start_monitoring(struct ast_channel *ast, int needlock)</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_channel_ref</span><span class="p">(</span><span class="n">p</span><span class="o">-></span><span class="n">owner</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">owner</span> <span class="o">=</span> <span class="n">p</span><span class="o">-></span><span class="n">owner</span><span class="p">;</span></pre></td>
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<pre style="margin-left: 2em; white-space: pre-wrap; white-space: -moz-pre-wrap; white-space: -pre-wrap; white-space: -o-pre-wrap; word-wrap: break-word;">You can just use owner = ast_channel_ref(p->owner)</pre>
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<a href="https://reviewboard.asterisk.org/r/1708/diff/3/?file=23869#file23869line563" style="color: black; font-weight: bold; text-decoration: underline;">/branches/1.8/channels/chan_agent.c</a>
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(Diff revision 3)
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<td colspan="4"><pre style="font-size: 8pt; line-height: 140%; margin: 0; ">static int agent_start_monitoring(struct ast_channel *ast, int needlock)</pre></td>
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<td bgcolor="#c5ffc4" width="50%"><pre style="font-size: 8pt; line-height: 140%; margin: 0; "> <span class="cm">/* Haven't used lock yet, so it should be safe to unlock it and retrieve the channel lock. */</span></pre></td>
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<pre style="margin-left: 2em; white-space: pre-wrap; white-space: -moz-pre-wrap; white-space: -pre-wrap; white-space: -o-pre-wrap; word-wrap: break-word;">I'd remove these comments - I don't think it adds much, and it seems to incorrectly apply that the first lock of p->lock isn't needed, when it is - it keeps the pvt locked while you determine if it has a channel owner. So you really are using the lock when you check if (p->owner)</pre>
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<a href="https://reviewboard.asterisk.org/r/1708/diff/3/?file=23869#file23869line602" style="color: black; font-weight: bold; text-decoration: underline;">/branches/1.8/channels/chan_agent.c</a>
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(Diff revision 3)
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<td colspan="4"><pre style="font-size: 8pt; line-height: 140%; margin: 0; ">static int agent_start_monitoring(struct ast_channel *ast, int needlock)</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">p</span><span class="o">-></span><span class="n">owner</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_channel_unref</span><span class="p">(</span><span class="n">owner</span><span class="p">);</span></pre></td>
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<pre style="margin-left: 2em; white-space: pre-wrap; white-space: -moz-pre-wrap; white-space: -pre-wrap; white-space: -o-pre-wrap; word-wrap: break-word;">You can just do owner = ast_channel_unref(owner) here; it will assign owner to NULL after unref'ing.</pre>
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<a href="https://reviewboard.asterisk.org/r/1708/diff/3/?file=23869#file23869line668" style="color: black; font-weight: bold; text-decoration: underline;">/branches/1.8/channels/chan_agent.c</a>
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(Diff revision 3)
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<td colspan="4"><pre style="font-size: 8pt; line-height: 140%; margin: 0; ">static int agent_start_monitoring(struct ast_channel *ast, int needlock)</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_channel_unref</span><span class="p">(</span><span class="n">owner</span><span class="p">);</span></pre></td>
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<pre style="margin-left: 2em; white-space: pre-wrap; white-space: -moz-pre-wrap; white-space: -pre-wrap; white-space: -o-pre-wrap; word-wrap: break-word;">owner = ast_channel_unref(owner) here</pre>
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<a href="https://reviewboard.asterisk.org/r/1708/diff/3/?file=23869#file23869line1530" style="color: black; font-weight: bold; text-decoration: underline;">/branches/1.8/channels/chan_agent.c</a>
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<td colspan="4"><pre style="font-size: 8pt; line-height: 140%; margin: 0; ">static int action_agents(struct mansession *s, const struct message *m)</pre></td>
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<td bgcolor="#ffffff" width="50%"><pre style="font-size: 8pt; line-height: 140%; margin: 0; "><span class="cm"> * \sa action_agent_logoff(), load_module().</span></pre></td>
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<td bgcolor="#ffffff" width="50%"><pre style="font-size: 8pt; line-height: 140%; margin: 0; "><span class="cm"> * \sa action_agent_logoff(), load_module().</span></pre></td>
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<pre style="margin-left: 2em; white-space: pre-wrap; white-space: -moz-pre-wrap; white-space: -pre-wrap; white-space: -o-pre-wrap; word-wrap: break-word;">Document here that this method will lock both the pvt and the owning channel</pre>
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<a href="https://reviewboard.asterisk.org/r/1708/diff/3/?file=23869#file23869line1553" style="color: black; font-weight: bold; text-decoration: underline;">/branches/1.8/channels/chan_agent.c</a>
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<td colspan="4"><pre style="font-size: 8pt; line-height: 140%; margin: 0; ">static int action_agents(struct mansession *s, const struct message *m)</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_channel_ref</span><span class="p">(</span><span class="n">p</span><span class="o">-></span><span class="n">owner</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">owner</span> <span class="o">=</span> <span class="n">p</span><span class="o">-></span><span class="n">owner</span><span class="p">;</span></pre></td>
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<pre style="margin-left: 2em; white-space: pre-wrap; white-space: -moz-pre-wrap; white-space: -pre-wrap; white-space: -o-pre-wrap; word-wrap: break-word;">You can just use owner = ast_channel_ref(p->owner)</pre>
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<a href="https://reviewboard.asterisk.org/r/1708/diff/3/?file=23869#file23869line1600" style="color: black; font-weight: bold; text-decoration: underline;">/branches/1.8/channels/chan_agent.c</a>
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<td colspan="4"><pre style="font-size: 8pt; line-height: 140%; margin: 0; ">static int action_agents(struct mansession *s, const struct message *m)</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_channel_unref</span><span class="p">(</span><span class="n">owner</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">owner</span> <span class="o">=</span> <span class="nb">NULL</span><span class="p">;</span></pre></td>
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<pre style="margin-left: 2em; white-space: pre-wrap; white-space: -moz-pre-wrap; white-space: -pre-wrap; white-space: -o-pre-wrap; word-wrap: break-word;">owner = ast_channel_unref(owner) here</pre>
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<a href="https://reviewboard.asterisk.org/r/1708/diff/3/?file=23869#file23869line1642" style="color: black; font-weight: bold; text-decoration: underline;">/branches/1.8/channels/chan_agent.c</a>
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<td colspan="4"><pre style="font-size: 8pt; line-height: 140%; margin: 0; ">static int agent_logoff(const char *agent, int soft)</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_channel_ref</span><span class="p">(</span><span class="n">p</span><span class="o">-></span><span class="n">owner</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">owner</span> <span class="o">=</span> <span class="n">p</span><span class="o">-></span><span class="n">owner</span><span class="p">;</span></pre></td>
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<pre style="margin-left: 2em; white-space: pre-wrap; white-space: -moz-pre-wrap; white-space: -pre-wrap; white-space: -o-pre-wrap; word-wrap: break-word;">You can just use owner = ast_channel_ref(p->owner)</pre>
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<a href="https://reviewboard.asterisk.org/r/1708/diff/3/?file=23869#file23869line1651" style="color: black; font-weight: bold; text-decoration: underline;">/branches/1.8/channels/chan_agent.c</a>
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<td colspan="4"><pre style="font-size: 8pt; line-height: 140%; margin: 0; ">static int agent_logoff(const char *agent, int soft)</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_channel_unref</span><span class="p">(</span><span class="n">owner</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">owner</span> <span class="o">=</span> <span class="nb">NULL</span><span class="p">;</span></pre></td>
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<pre style="margin-left: 2em; white-space: pre-wrap; white-space: -moz-pre-wrap; white-space: -pre-wrap; white-space: -o-pre-wrap; word-wrap: break-word;">owner = ast_channel_unref(owner) here</pre>
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<a href="https://reviewboard.asterisk.org/r/1708/diff/3/?file=23869#file23869line1792" style="color: black; font-weight: bold; text-decoration: underline;">/branches/1.8/channels/chan_agent.c</a>
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<td colspan="4"><pre style="font-size: 8pt; line-height: 140%; margin: 0; ">static char *agents_show(struct ast_cli_entry *e, int cmd, struct ast_cli_args *a)</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_channel_ref</span><span class="p">(</span><span class="n">p</span><span class="o">-></span><span class="n">owner</span><span class="p">);</span></pre></td>
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<th bgcolor="#b1ebb0" style="border-left: 1px solid #C0C0C0; border-right: 1px solid #C0C0C0;" align="right"><font size="2">1778</font></th>
<td bgcolor="#c5ffc4" width="50%"><pre style="font-size: 8pt; line-height: 140%; margin: 0; "> <span class="n">owner</span> <span class="o">=</span> <span class="n">p</span><span class="o">-></span><span class="n">owner</span><span class="p">;</span></pre></td>
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<pre style="margin-left: 2em; white-space: pre-wrap; white-space: -moz-pre-wrap; white-space: -pre-wrap; white-space: -o-pre-wrap; word-wrap: break-word;">You can just use owner = ast_channel_ref(p->owner)</pre>
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<a href="https://reviewboard.asterisk.org/r/1708/diff/3/?file=23869#file23869line1831" style="color: black; font-weight: bold; text-decoration: underline;">/branches/1.8/channels/chan_agent.c</a>
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(Diff revision 3)
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<td colspan="4"><pre style="font-size: 8pt; line-height: 140%; margin: 0; ">static char *agents_show(struct ast_cli_entry *e, int cmd, struct ast_cli_args *a)</pre></td>
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<th bgcolor="#b1ebb0" style="border-left: 1px solid #C0C0C0; border-right: 1px solid #C0C0C0;" align="right"><font size="2">1816</font></th>
<td bgcolor="#c5ffc4" width="50%"><pre style="font-size: 8pt; line-height: 140%; margin: 0; "> <span class="n">ast_channel_unref</span><span class="p">(</span><span class="n">owner</span><span class="p">);</span></pre></td>
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<th bgcolor="#b1ebb0" style="border-left: 1px solid #C0C0C0; border-right: 1px solid #C0C0C0;" align="right"><font size="2">1817</font></th>
<td bgcolor="#c5ffc4" width="50%"><pre style="font-size: 8pt; line-height: 140%; margin: 0; "> <span class="n">owner</span> <span class="o">=</span> <span class="nb">NULL</span><span class="p">;</span></pre></td>
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<pre style="margin-left: 2em; white-space: pre-wrap; white-space: -moz-pre-wrap; white-space: -pre-wrap; white-space: -o-pre-wrap; word-wrap: break-word;">owner = ast_channel_unref(owner) here</pre>
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<a href="https://reviewboard.asterisk.org/r/1708/diff/3/?file=23869#file23869line1879" style="color: black; font-weight: bold; text-decoration: underline;">/branches/1.8/channels/chan_agent.c</a>
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(Diff revision 3)
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<td colspan="4"><pre style="font-size: 8pt; line-height: 140%; margin: 0; ">static char *agents_show_online(struct ast_cli_entry *e, int cmd, struct ast_cli_args *a)</pre></td>
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<th bgcolor="#b1ebb0" style="border-left: 1px solid #C0C0C0; border-right: 1px solid #C0C0C0;" align="right"><font size="2">1864</font></th>
<td bgcolor="#c5ffc4" width="50%"><pre style="font-size: 8pt; line-height: 140%; margin: 0; "> <span class="n">ast_channel_ref</span><span class="p">(</span><span class="n">p</span><span class="o">-></span><span class="n">owner</span><span class="p">);</span></pre></td>
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<th bgcolor="#b1ebb0" style="border-left: 1px solid #C0C0C0; border-right: 1px solid #C0C0C0;" align="right"><font size="2">1865</font></th>
<td bgcolor="#c5ffc4" width="50%"><pre style="font-size: 8pt; line-height: 140%; margin: 0; "> <span class="n">owner</span> <span class="o">=</span> <span class="n">p</span><span class="o">-></span><span class="n">owner</span><span class="p">;</span></pre></td>
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<pre style="margin-left: 2em; white-space: pre-wrap; white-space: -moz-pre-wrap; white-space: -pre-wrap; white-space: -o-pre-wrap; word-wrap: break-word;">You can just use owner = ast_channel_ref(p->owner)</pre>
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<a href="https://reviewboard.asterisk.org/r/1708/diff/3/?file=23869#file23869line1904" style="color: black; font-weight: bold; text-decoration: underline;">/branches/1.8/channels/chan_agent.c</a>
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(Diff revision 3)
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<td colspan="4"><pre style="font-size: 8pt; line-height: 140%; margin: 0; ">static char *agents_show_online(struct ast_cli_entry *e, int cmd, struct ast_cli_args *a)</pre></td>
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<th bgcolor="#b1ebb0" style="border-left: 1px solid #C0C0C0; border-right: 1px solid #C0C0C0;" align="right"><font size="2">1889</font></th>
<td bgcolor="#c5ffc4" width="50%"><pre style="font-size: 8pt; line-height: 140%; margin: 0; "> <span class="n">ast_channel_unref</span><span class="p">(</span><span class="n">owner</span><span class="p">);</span></pre></td>
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<th bgcolor="#b1ebb0" style="border-left: 1px solid #C0C0C0; border-right: 1px solid #C0C0C0;" align="right"><font size="2">1890</font></th>
<td bgcolor="#c5ffc4" width="50%"><pre style="font-size: 8pt; line-height: 140%; margin: 0; "> <span class="n">owner</span> <span class="o">=</span> <span class="nb">NULL</span><span class="p">;</span></pre></td>
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<pre style="margin-left: 2em; white-space: pre-wrap; white-space: -moz-pre-wrap; white-space: -pre-wrap; white-space: -o-pre-wrap; word-wrap: break-word;">owner = ast_channel_unref(owner) here</pre>
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<a href="https://reviewboard.asterisk.org/r/1708/diff/3/?file=23869#file23869line2488" style="color: black; font-weight: bold; text-decoration: underline;">/branches/1.8/channels/chan_agent.c</a>
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(Diff revision 3)
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<td colspan="4"><pre style="font-size: 8pt; line-height: 140%; margin: 0; ">static int agents_data_provider_get(const struct ast_data_search *search,</pre></td>
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<th bgcolor="#b1ebb0" style="border-left: 1px solid #C0C0C0; border-right: 1px solid #C0C0C0;" align="right"><font size="2">2473</font></th>
<td bgcolor="#c5ffc4" width="50%"><pre style="font-size: 8pt; line-height: 140%; margin: 0; "> <span class="n">ast_channel_ref</span><span class="p">(</span><span class="n">p</span><span class="o">-></span><span class="n">owner</span><span class="p">);</span></pre></td>
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<th bgcolor="#b1ebb0" style="border-left: 1px solid #C0C0C0; border-right: 1px solid #C0C0C0;" align="right"><font size="2">2474</font></th>
<td bgcolor="#c5ffc4" width="50%"><pre style="font-size: 8pt; line-height: 140%; margin: 0; "> <span class="n">owner</span> <span class="o">=</span> <span class="n">p</span><span class="o">-></span><span class="n">owner</span><span class="p">;</span></pre></td>
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<pre style="margin-left: 2em; white-space: pre-wrap; white-space: -moz-pre-wrap; white-space: -pre-wrap; white-space: -o-pre-wrap; word-wrap: break-word;">You can just use owner = ast_channel_ref(p->owner)</pre>
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<a href="https://reviewboard.asterisk.org/r/1708/diff/3/?file=23869#file23869line2508" style="color: black; font-weight: bold; text-decoration: underline;">/branches/1.8/channels/chan_agent.c</a>
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(Diff revision 3)
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<td colspan="4"><pre style="font-size: 8pt; line-height: 140%; margin: 0; ">static int agents_data_provider_get(const struct ast_data_search *search,</pre></td>
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<th bgcolor="#b1ebb0" style="border-left: 1px solid #C0C0C0; border-right: 1px solid #C0C0C0;" align="right"><font size="2">2493</font></th>
<td bgcolor="#c5ffc4" width="50%"><pre style="font-size: 8pt; line-height: 140%; margin: 0; "> <span class="n">ast_channel_unref</span><span class="p">(</span><span class="n">owner</span><span class="p">);</span></pre></td>
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<th bgcolor="#b1ebb0" style="border-right: 1px solid #C0C0C0;" align="right"><font size="2"></font></th>
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<th bgcolor="#b1ebb0" style="border-left: 1px solid #C0C0C0; border-right: 1px solid #C0C0C0;" align="right"><font size="2">2494</font></th>
<td bgcolor="#c5ffc4" width="50%"><pre style="font-size: 8pt; line-height: 140%; margin: 0; "> <span class="n">owner</span> <span class="o">=</span> <span class="nb">NULL</span><span class="p">;</span></pre></td>
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<pre style="margin-left: 2em; white-space: pre-wrap; white-space: -moz-pre-wrap; white-space: -pre-wrap; white-space: -o-pre-wrap; word-wrap: break-word;">owner = ast_channel_unref(owner) here</pre>
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<a href="https://reviewboard.asterisk.org/r/1708/diff/3/?file=23869#file23869line2521" style="color: black; font-weight: bold; text-decoration: underline;">/branches/1.8/channels/chan_agent.c</a>
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(Diff revision 3)
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<td colspan="4"><pre style="font-size: 8pt; line-height: 140%; margin: 0; ">static int agents_data_provider_get(const struct ast_data_search *search,</pre></td>
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<th bgcolor="#b1ebb0" style="border-left: 1px solid #C0C0C0; border-right: 1px solid #C0C0C0;" align="right"><font size="2">2506</font></th>
<td bgcolor="#c5ffc4" width="50%"><pre style="font-size: 8pt; line-height: 140%; margin: 0; "> <span class="n">ast_channel_unref</span><span class="p">(</span><span class="n">owner</span><span class="p">);</span></pre></td>
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<th bgcolor="#b1ebb0" style="border-left: 1px solid #C0C0C0; border-right: 1px solid #C0C0C0;" align="right"><font size="2">2507</font></th>
<td bgcolor="#c5ffc4" width="50%"><pre style="font-size: 8pt; line-height: 140%; margin: 0; "> <span class="n">owner</span> <span class="o">=</span> <span class="nb">NULL</span><span class="p">;</span></pre></td>
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<pre style="margin-left: 2em; white-space: pre-wrap; white-space: -moz-pre-wrap; white-space: -pre-wrap; white-space: -o-pre-wrap; word-wrap: break-word;">owner = ast_channel_unref(owner) here</pre>
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<a href="https://reviewboard.asterisk.org/r/1708/diff/3/?file=23869#file23869line2537" style="color: black; font-weight: bold; text-decoration: underline;">/branches/1.8/channels/chan_agent.c</a>
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<td colspan="4"><pre style="font-size: 8pt; line-height: 140%; margin: 0; ">static int agents_data_provider_get(const struct ast_data_search *search,</pre></td>
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<th bgcolor="#b1ebb0" style="border-left: 1px solid #C0C0C0; border-right: 1px solid #C0C0C0;" align="right"><font size="2">2522</font></th>
<td bgcolor="#c5ffc4" width="50%"><pre style="font-size: 8pt; line-height: 140%; margin: 0; "> <span class="n">ast_channel_unref</span><span class="p">(</span><span class="n">owner</span><span class="p">);</span></pre></td>
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<th bgcolor="#b1ebb0" style="border-left: 1px solid #C0C0C0; border-right: 1px solid #C0C0C0;" align="right"><font size="2">2523</font></th>
<td bgcolor="#c5ffc4" width="50%"><pre style="font-size: 8pt; line-height: 140%; margin: 0; "> <span class="n">owner</span> <span class="o">=</span> <span class="nb">NULL</span><span class="p">;</span></pre></td>
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<pre style="margin-left: 2em; white-space: pre-wrap; white-space: -moz-pre-wrap; white-space: -pre-wrap; white-space: -o-pre-wrap; word-wrap: break-word;">owner = ast_channel_unref(owner) here</pre>
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<p>- Matt</p>
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<p>On February 2nd, 2012, 9:01 a.m., jrose wrote:</p>
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<div>Review request for Asterisk Developers, Mark Michelson, rmudgett, and Matt Jordan.</div>
<div>By jrose.</div>
<p style="color: grey;"><i>Updated Feb. 2, 2012, 9:01 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;">Also adds locking to a number of other functions which are calling ast_bridged_channel (which is documented as requiring a lock for safe running, which was the purpose of irroot's original locking patch in action_agents.
Unlike the other patch on reviewboard right now, this opts to enforce locking order instead of using deadlock avoidance.
Celebrity endorsement: "This looks incredibly sane to me." - MMichelson</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;">Not much I'm afraid to say. I can't reproduce the issue since it involves real world use over a period of time. I'll ask Alex Villacís Lasso to give it a shot though.</pre>
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<b style="color: #575012; font-size: 10pt; margin-top: 1.5em;">Bugs: </b>
<a href="https://issues.asterisk.org/jira/browse/ASTERISK-19285">ASTERISK-19285</a>
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<h1 style="color: #575012; font-size: 10pt; margin-top: 1.5em;">Diffs</b> </h1>
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<li>/branches/1.8/channels/chan_agent.c <span style="color: grey">(353685)</span></li>
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<p><a href="https://reviewboard.asterisk.org/r/1708/diff/" style="margin-left: 3em;">View Diff</a></p>
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