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This is an automatically generated e-mail. To reply, visit:
<a href="https://reviewboard.asterisk.org/r/3424/">https://reviewboard.asterisk.org/r/3424/</a>
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<p style="margin-top: 0;">On April 10th, 2014, 3:35 p.m. EDT, <b>Mark Michelson</b> wrote:</p>
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<a href="https://reviewboard.asterisk.org/r/3424/diff/2/?file=57155#file57155line1067" style="color: black; font-weight: bold; text-decoration: underline;">/trunk/apps/app_mixmonitor.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 mixmonitor_exec(struct ast_channel *chan, const char *data)</pre></td>
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<td bgcolor="#c5ffc4" width="50%"><pre style="font-size: 8pt; line-height: 140%; margin: 0; "></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="k">if</span> <span class="p">(</span><span class="n">ast_module_check</span><span class="p">(</span><span class="s">"func_periodic_hook"</span><span class="p">))</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;">Suggestion:
Instead of doing ast_module_check(), use ast_custom_function_find() to find the PERIODIC_HOOK function. I have a couple of reasons for this:
1) Currently, if func_periodic_hook.so is loaded, it also means that PERIODIC_HOOK is registered, but that assumption may not always hold.
2) More importantly, getting the ast_custom_function allows for you to bump the module refcount for func_periodic_hook.so so that the module cannot be unloaded while there is an active mixmonitor. You can decrement the module refcount when the mixmonitor is destroyed.</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 started looking at this, but I'm not sure the alternative is better. They both have downsides. ast_custom_function_find() may be worse.
Re: #1, you're right, but ...
Re: #2, the module ref count is now always incremented on func_periodic_hook.so when PERIODIC_HOOK() is active. Also, it looks like ast_custom_function_find() isn't safe. There is a race condition between finding a function and incrementing the module ref count where the module could be unloaded and cause a crash. At least with ast_module_check(), ast_func_read() may fail, but it's handled gracefully without crashing.</pre>
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<p>- Russell</p>
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<p>On April 8th, 2014, 7:49 p.m. EDT, Russell Bryant wrote:</p>
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<div>Review request for Asterisk Developers.</div>
<div>By Russell Bryant.</div>
<p style="color: grey;"><i>Updated April 8, 2014, 7:49 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;">Add an option to enable a periodic beep to be played into a call if it
is being recorded. If enabled, it uses the PERIODIC_HOOK() function
internally to play the 'beep' prompt into the call at a specified
interval.
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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;">exten => 103,1,Answer()
same => n,MixMonitor(test.gsm,B(5))
same => n,MusicOnHold()
exten => 104,1,Answer()
same => n,MixMonitor(test.gsm,B)
same => n,MusicOnHold()
exten => 105,1,Answer()
same => n,MixMonitor(test.gsm,B(3))
same => n,StartMusicOnHold()
same => n,Wait(15)
same => n,StopMusicOnHold()
same => n,StopMixMonitor()
same => n,Wait(5)
same => n,Hangup()
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<h1 style="color: #575012; font-size: 10pt; margin-top: 1.5em;">Diffs</b> </h1>
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<li>/trunk/main/app.c <span style="color: grey">(412023)</span></li>
<li>/trunk/include/asterisk/app.h <span style="color: grey">(412023)</span></li>
<li>/trunk/funcs/func_periodic_hook.c <span style="color: grey">(412023)</span></li>
<li>/trunk/apps/app_mixmonitor.c <span style="color: grey">(412023)</span></li>
<li>/trunk/CHANGES <span style="color: grey">(412023)</span></li>
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<p><a href="https://reviewboard.asterisk.org/r/3424/diff/" style="margin-left: 3em;">View Diff</a></p>
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