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<p style="margin-top: 0;">On February 14th, 2012, 11:16 a.m., <b>rmudgett</b> wrote:</p>
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<a href="https://reviewboard.asterisk.org/r/1719/diff/2/?file=23940#file23940line47" style="color: black; font-weight: bold; text-decoration: underline;">/branches/1.8/include/asterisk/res_odbc.h</a>
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<td colspan="4"><pre style="font-size: 8pt; line-height: 140%; margin: 0; ">enum {</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_<span class="hl">mutex</span>_t</span> <span class="n">lock</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_<span class="hl">rwlock</span>_t</span> <span class="n">lock</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 odbc_obj is an ao2 object, the lock should have been removed and the ao2 object lock should have been used instead. On trunk this would be a good candidate to convert to using the ao2 rwlock when I ever get around to merging that feature. :)</pre>
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<p>On February 14th, 2012, 1:22 p.m., <b>Tilghman Lesher</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;">It was actually kept this way to keep the API consistent across major releases. In any case, this change should not happen in the 1.8 branch, to keep the release API consistent. This review should be updated to apply only to trunk.</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;">For now I've converted it to use ao2_lock. If you think we should hold off until you have ao2_rwlock merged into trunk, we can do that too, but it seems to be working as it is right now, at least for the situations I've been testing.</pre>
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<p style="margin-top: 0;">On February 14th, 2012, 11:16 a.m., <b>rmudgett</b> wrote:</p>
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<a href="https://reviewboard.asterisk.org/r/1719/diff/2/?file=23941#file23941line555" style="color: black; font-weight: bold; text-decoration: underline;">/branches/1.8/res/res_odbc.c</a>
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<td colspan="4"><pre style="font-size: 8pt; line-height: 140%; margin: 0; ">int ast_odbc_clear_cache(const char *database, const char *tablename)</pre></td>
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<td bgcolor="#ffffff" width="50%"><pre style="font-size: 8pt; line-height: 140%; margin: 0; "> <span class="k">if</span> <span class="p">(</span><span class="n">obj</span><span class="p">)</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="k">if</span> <span class="p">(</span><span class="n">obj</span><span class="p">)</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_odbc_release_obj</span><span class="p">(</span><span class="n">obj</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_odbc_release_obj</span><span class="p">(</span><span class="n">obj</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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<pre style="white-space: pre-wrap; white-space: -moz-pre-wrap; white-space: -pre-wrap; white-space: -o-pre-wrap; word-wrap: break-word;">obj is never NULL here</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;">Got it.</pre>
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<p style="margin-top: 0;">On February 14th, 2012, 11:16 a.m., <b>rmudgett</b> wrote:</p>
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<a href="https://reviewboard.asterisk.org/r/1719/diff/2/?file=23941#file23941line628" style="color: black; font-weight: bold; text-decoration: underline;">/branches/1.8/res/res_odbc.c</a>
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<td colspan="4"><pre style="font-size: 8pt; line-height: 140%; margin: 0; ">SQLHSTMT ast_odbc_direct_execute(struct odbc_obj *obj, SQLHSTMT (*exec_cb)(struct odbc_obj *obj, void *data), void *data)</pre></td>
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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;">got it.</pre>
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<p style="margin-top: 0;">On February 14th, 2012, 11:16 a.m., <b>rmudgett</b> wrote:</p>
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<a href="https://reviewboard.asterisk.org/r/1719/diff/2/?file=23941#file23941line763" style="color: black; font-weight: bold; text-decoration: underline;">/branches/1.8/res/res_odbc.c</a>
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<td colspan="2"><pre style="font-size: 8pt; line-height: 140%; margin: 0; ">int ast_odbc_sanity_check(struct odbc_obj *obj)</pre></td>
<td colspan="2"><pre style="font-size: 8pt; line-height: 140%; margin: 0; ">static int __ast_odbc_sanity_check(struct odbc_obj *obj, int wrlock)</pre></td>
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<td bgcolor="#c5ffc4" 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><span class="n">wrlock</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="cm">/* Bah, need to upgrade to a write lock */</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_rwlock_unlock</span><span class="p">(</span><span class="o">&</span><span class="n">obj</span><span class="o">-></span><span class="n">lock</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_rwlock_wrlock</span><span class="p">(</span><span class="o">&</span><span class="n">obj</span><span class="o">-></span><span class="n">lock</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="cm">/* If the connection is back up once we have the write lock, we</span></pre></td>
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<td bgcolor="#c5ffc4" width="50%"><pre style="font-size: 8pt; line-height: 140%; margin: 0; "><span class="cm"> * don't need to disconnect and reconnect. */</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">do_reconnect</span> <span class="o">=</span> <span class="p">(</span><span class="o">!</span><span class="n">obj</span><span class="o">-></span><span class="n">up</span> <span class="o">&&</span> <span class="o">!</span><span class="n">obj</span><span class="o">-></span><span class="n">tx</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="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;">There is no memory that the wrlock is held on the object. There are a few cases where the sanity check is already wrlocked from the last time the sanity check was called. So upgrading from a wrlock to a wrlock is rather pointless.
A wrlock/unlock helper function could be created that sets a wrlock_held flag on the object when the wrlock is obtained and clears the flag when the lock is released.
Using the wrlock_held flag would remove the need for the different ast_odbc_sanity_check calls.</pre>
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<p>On February 14th, 2012, 1:21 p.m., <b>Tilghman Lesher</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;">That's a good point, and I like that approach.</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'll keep this in mind if we go back to read/write locks later.</pre>
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<p style="margin-top: 0;">On February 14th, 2012, 11:16 a.m., <b>rmudgett</b> wrote:</p>
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<a href="https://reviewboard.asterisk.org/r/1719/diff/2/?file=23941#file23941line1534" style="color: black; font-weight: bold; text-decoration: underline;">/branches/1.8/res/res_odbc.c</a>
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<td colspan="4"><pre style="font-size: 8pt; line-height: 140%; margin: 0; ">struct odbc_obj *ast_odbc_retrieve_transaction_obj(struct ast_channel *chan, const char *objname)</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_log</span><span class="p">(</span><span class="n">LOG_WARNING</span><span class="p">,</span> <span class="s">"Unable to deallocate database handle? %d errno=%d %s</span><span class="se">\n</span><span class="s">"</span><span class="p">,</span> <span class="n">res</span><span class="p">,</span> <span class="p">(</span><span class="kt">int</span><span class="p">)</span><span class="n">err</span><span class="p">,</span> <span class="n">msg</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_log</span><span class="p">(</span><span class="n">LOG_WARNING</span><span class="p">,</span> <span class="s">"Unable to deallocate database handle<span class="hl"> %p</span>? %d errno=%d %s</span><span class="se">\n</span><span class="s">"</span><span class="p"><span class="hl">,</span></span><span class="hl"> </span><span class="n"><span class="hl">obj</span></span><span class="o"><span class="hl">-></span></span><span class="n"><span class="hl">con</span></span><span class="p">,</span> <span class="n">res</span><span class="p">,</span> <span class="p">(</span><span class="kt">int</span><span class="p">)</span><span class="n">err</span><span class="p">,</span> <span class="n">msg</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;">obj->con should be just con here because we set obj->con to NULL earlier.</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 February 14th, 2012, 11:16 a.m., <b>rmudgett</b> wrote:</p>
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<a href="https://reviewboard.asterisk.org/r/1719/diff/2/?file=23941#file23941line1552" style="color: black; font-weight: bold; text-decoration: underline;">/branches/1.8/res/res_odbc.c</a>
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<td colspan="4"><pre style="font-size: 8pt; line-height: 140%; margin: 0; ">struct odbc_obj *ast_odbc_retrieve_transaction_obj(struct ast_channel *chan, const char *objname)</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_mutex_lock</span><span class="p">(</span><span class="o">&</span><span class="n">obj</span><span class="o">-></span><span class="n">lock</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">SQLHDBC</span> <span class="n">con</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;">I wonder if con needs to be initialized to NULL for safety or does SQLAllocHandle always set the con value?</pre>
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<p>On February 14th, 2012, 1:23 p.m., <b>Tilghman Lesher</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;">As long as it was handed a valid env handle (for which allocation succeeds as long as it can calloc()), then SQLAllocHandle will always initialize con. If SQLAllocHandle on the env can't calloc(), then we're going to fail spectacularly anyway.</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'm guessing there isn't any harm in initializing it to NULL anyway.</pre>
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<p>- jrose</p>
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<p>On February 24th, 2012, 2:02 p.m., jrose wrote:</p>
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<div>Review request for Asterisk Developers, Mark Michelson, Tilghman Lesher, rmudgett, and wdoekes.</div>
<div>By jrose.</div>
<p style="color: grey;"><i>Updated Feb. 24, 2012, 2:02 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 is a continuation of wdoekes patch seen in https://reviewboard.asterisk.org/r/1622/
This adds Tilghman Lesher's suggested changes.</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 started by confirming that the segfault could be easily reproduced with wdoekes' setup mentioned in the issue report.
After finishing the changes to the patch, I confirmed that following the same steps no longer produced the segfault, undid the patch to double check that I was doing it right, and then decided it was safe to post this review.</pre>
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<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-19011">ASTERISK-19011</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/res/res_odbc.c <span style="color: grey">(356521)</span></li>
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<p><a href="https://reviewboard.asterisk.org/r/1719/diff/" style="margin-left: 3em;">View Diff</a></p>
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