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This is an automatically generated e-mail. To reply, visit:
<a href="https://reviewboard.asterisk.org/r/2881/">https://reviewboard.asterisk.org/r/2881/</a>
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<a href="https://reviewboard.asterisk.org/r/2881/diff/1/?file=46358#file46358line35" style="color: black; font-weight: bold; text-decoration: underline;">/branches/12/main/sem.c</a>
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(Diff revision 1)
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<td bgcolor="#c5ffc4" width="50%"><pre style="font-size: 8pt; line-height: 140%; margin: 0; "><span class="kt">int</span> <span class="n">ast_sem_init</span><span class="p">(</span><span class="k">struct</span> <span class="n">ast_sem</span> <span class="o">*</span><span class="n">sem</span><span class="p">,</span> <span class="kt">int</span> <span class="n">pshared</span><span class="p">,</span> <span class="kt">unsigned</span> <span class="kt">int</span> <span class="n">value</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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<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">pshared</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="cm">/* Don't need it... yet */</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">errno</span> <span class="o">=</span> <span class="n">ENOSYS</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="o">-</span><span class="mi">1</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="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="n">sem</span><span class="o">-></span><span class="n">count</span> <span class="o">=</span> <span class="n">value</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;">To mirror typical semaphore behavior, you should return an error and set errno to EINVAL if value exceeds SEM_VALUE_MAX;
Also, since semaphore values should never dip below 0, you should probably assert that value >= 0.</pre>
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<a href="https://reviewboard.asterisk.org/r/2881/diff/1/?file=46358#file46358line63" style="color: black; font-weight: bold; text-decoration: underline;">/branches/12/main/sem.c</a>
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(Diff revision 1)
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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">sem</span><span class="o">-></span><span class="n">count</span> <span class="o">==</span> <span class="n">INT_MAX</span><span class="p">)</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;">If it's available, you should probably use SEM_VALUE_MAX here instead of INT_MAX.</pre>
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<p>- Mark</p>
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<p>On September 25th, 2013, 10:13 p.m. UTC, David Lee wrote:</p>
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<div>Review request for Asterisk Developers.</div>
<div>By David Lee.</div>
<p style="color: grey;"><i>Updated Sept. 25, 2013, 10:13 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 patch optimizes taskprocessor to use a semaphore for signaling,
which the OS can do a better job at managing contention and waiting
that we can with a mutex and condition.
The taskprocessor execution was also slightly optimized to reduce the
number of locks taken.
The only observable difference in the taskprocessor implementation is
that when the final reference to the taskprocessor goes away, it will
execute all tasks to completion instead of discarding the unexecuted
tasks.
For systems where unnamed semaphores are not supported, a really
simple semaphore implementation is provided. (Which gives identical
performance as the original taskprocessor implementation).
The way we ended up implementing Stasis caused the threadpool to be a
burden instead of a boost to performance. This was switched to just
use taskprocessors directly for subscriptions.</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;">Unit tests pass.
Same performance test as from https://reviewboard.asterisk.org/r/2873/</pre>
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<h1 style="color: #575012; font-size: 10pt; margin-top: 1.5em;">Diffs</b> </h1>
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<li>/branches/12/main/taskprocessor.c <span style="color: grey">(399869)</span></li>
<li>/branches/12/main/stasis_config.c <span style="color: grey">(399869)</span></li>
<li>/branches/12/main/sem.c <span style="color: grey">(PRE-CREATION)</span></li>
<li>/branches/12/main/stasis.c <span style="color: grey">(399869)</span></li>
<li>/branches/12/include/asterisk/taskprocessor.h <span style="color: grey">(399869)</span></li>
<li>/branches/12/include/asterisk/stasis.h <span style="color: grey">(399869)</span></li>
<li>/branches/12/include/asterisk/sem.h <span style="color: grey">(PRE-CREATION)</span></li>
<li>/branches/12/include/asterisk/autoconfig.h.in <span style="color: grey">(399869)</span></li>
<li>/branches/12/configure <span style="color: grey">(UNKNOWN)</span></li>
<li>/branches/12/configure.ac <span style="color: grey">(399869)</span></li>
<li>/branches/12/configs/stasis.conf.sample <span style="color: grey">(399869)</span></li>
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<p><a href="https://reviewboard.asterisk.org/r/2881/diff/" style="margin-left: 3em;">View Diff</a></p>
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