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This is an automatically generated e-mail. To reply, visit:
<a href="https://reviewboard.asterisk.org/r/1554/">https://reviewboard.asterisk.org/r/1554/</a>
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<p style="margin-top: 0;">On October 31st, 2011, 6:02 p.m., <b>David Vossel</b> wrote:</p>
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<a href="https://reviewboard.asterisk.org/r/1554/diff/1/?file=21542#file21542line729" style="color: black; font-weight: bold; text-decoration: underline;">/trunk/include/asterisk/astobj2.h</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; ">enum _cb_results {</pre></td>
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<td bgcolor="#fdfebc" width="50%"><pre style="font-size: 8pt; line-height: 140%; margin: 0; "> <span class="cm">/*!<span class="ew"> </span></span></pre></td>
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<td bgcolor="#fdfebc" width="50%"><pre style="font-size: 8pt; line-height: 140%; margin: 0; "> <span class="cm">/*!</span></pre></td>
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<td bgcolor="#fdfebc" width="50%"><pre style="font-size: 8pt; line-height: 140%; margin: 0; "><span class="cm"> * \brief <span class="hl">By using</span> th<span class="hl">is flag,</span> the ao2_container <span class="hl">being searched will _NOT_</span></span></pre></td>
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<td bgcolor="#fdfebc" width="50%"><pre style="font-size: 8pt; line-height: 140%; margin: 0; "><span class="cm"> * \brief <span class="hl">Assume</span> th<span class="hl">at</span> the ao2_container <span class="hl">is already locked.</span></span></pre></td>
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<td bgcolor="#fdfebc" width="50%"><pre style="font-size: 8pt; line-height: 140%; margin: 0; "><span class="cm"> * be locked. Only use this flag if the ao2_container is being protected</span></pre></td>
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<td bgcolor="#fdfebc" width="50%"><pre style="font-size: 8pt; line-height: 140%; margin: 0; "><span class="cm"> *</span></pre></td>
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<td bgcolor="#fdfebc" width="50%"><pre style="font-size: 8pt; line-height: 140%; margin: 0; "><span class="cm"> * by another mechanism other that the internal ao2_lock.</span></pre></td>
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<td bgcolor="#fdfebc" width="50%"><pre style="font-size: 8pt; line-height: 140%; margin: 0; "><span class="cm"> * \note For ao2_containers that have mutexes, no locking will</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"> * be done.</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"> *</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"> * \note For ao2_containers that have RWLOCKs, the lock will be</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"> * promoted to write mode as needed. The lock will be returned</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"> * to the original locked state.</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"> *</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"> * \note Only use this flag if the ao2_container is manually</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"> * locked already.</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"> */</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"> */</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">OBJ_NOLOCK</span> <span class="o">=</span> <span class="p">(</span><span class="mi">1</span> <span class="o"><<</span> <span class="mi">5</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">OBJ_NOLOCK</span> <span class="o">=</span> <span class="p">(</span><span class="mi">1</span> <span class="o"><<</span> <span class="mi">5</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="cm">/*!</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">/*!</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 kind of hate this option... Which is okay for me to say because I made it.
It was made to optimize how I was doing the format interface lookup to use read write locks external to the astobj2 container. Now that rw locks are a part of the container itself, lets just get rid of this option all together. It adds some really weird complications to the whole thing now. This flag is used on app_queue as well, for a completely different reason that I am not fond of. That usage should just go away.
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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;">You were just completing the set since the corresponding iterator flag has existed for a very long time.
This flag and the corresponding flag for iterators are needed for RWLOCKs as stated in the note describing the flag above. For an example of how it is used properly see format.c:ast_format_attr_reg_interface().
The flag must be used with RWLOCKs to tell the ao2 code that the thread already holds a lock and so it can detect what lock strength is held.
The use of the OBJ_LOCK flag by app_queue.c is within the rules defined here. I don't see much gain with its use there since I don't think that acquiring a MUTEX lock a second time is that expensive.</pre>
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<p>- rmudgett</p>
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<p>On October 31st, 2011, 3:01 p.m., rmudgett wrote:</p>
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<div>Review request for Asterisk Developers and David Vossel.</div>
<div>By rmudgett.</div>
<p style="color: grey;"><i>Updated Oct. 31, 2011, 3:01 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;">Add the ability to specify what kind of locking an ao2 object has when it is allocated.
The locking could be one of: MUTEX, RWLOCK, or none.
New API:
ao2_t_alloc_options()
ao2_alloc_options()
ao2_t_container_alloc_options()
ao2_container_alloc_options()
ao2_rdlock()
ao2_wrlock()
ao2_tryrdlock()
ao2_trywrlock()
The OBJ_NOLOCK and AO2_ITERATOR_DONTLOCK flags have a slight meaning
change. They no longer mean that the object is protected by an external
mechanism. They mean the lock associated with the object has already been
manually obtained by one of the ao2_lock calls. This change is necessary
for RWLOCK support since they are not reentrant. Also an operation on an
ao2 container may require promoting a read lock to a write lock by
releasing the already held read lock to re-acquire as a write lock.
The changes to format.c and format_cap.c are taking advantange of the new
ao2 locking options to simplify the use of the format capabilities
containers.
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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;">Ran the ao2 unit tests.
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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/lock.h <span style="color: grey">(342867)</span></li>
<li>/trunk/main/astobj2.c <span style="color: grey">(342867)</span></li>
<li>/trunk/main/format.c <span style="color: grey">(342867)</span></li>
<li>/trunk/main/format_cap.c <span style="color: grey">(342867)</span></li>
<li>/trunk/include/asterisk/astobj2.h <span style="color: grey">(342867)</span></li>
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<p><a href="https://reviewboard.asterisk.org/r/1554/diff/" style="margin-left: 3em;">View Diff</a></p>
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