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This is an automatically generated e-mail. To reply, visit:
<a href="https://reviewboard.asterisk.org/r/1184/">https://reviewboard.asterisk.org/r/1184/</a>
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<p style="margin-top: 0;">On April 15th, 2011, 11:10 p.m., <b>Mark Michelson</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;">I like this idea since it makes ao2_containers operate more like how hashtables and dictionaries typically do. That is, you look up an object by its key, not by using another object of the same type. I initially was going to suggest moving towards the entire eradication of OBJ_POINTER, but since some structures may have more complicated hashes than just a single field (and they typically don't store their location information in a sub-struct), this may not be the best idea. The name OBJ_CUSTOM makes sense, but I think it could be improved. Perhaps something like OBJ_KEY or OBJ_HASHKEY would fit, since you are looking up an object by some key value.</pre>
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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;">Thanks a lot for the review, Mark! I like your name suggestion. I'll change it in the next rev.</pre>
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<p style="margin-top: 0;">On April 15th, 2011, 11:10 p.m., <b>Mark Michelson</b> wrote:</p>
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<a href="https://reviewboard.asterisk.org/r/1184/diff/1/?file=16171#file16171line683" 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 search_flags {</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; "> * \brief The data is hashable, but is not an object.</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; "> * This can be used when you want to be able to pass custom data</pre></td>
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<td bgcolor="#c5ffc4" width="50%"><pre style="font-size: 8pt; line-height: 140%; margin: 0; "> * to a hash function that is not a full object, but perhaps just</pre></td>
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<td bgcolor="#c5ffc4" width="50%"><pre style="font-size: 8pt; line-height: 140%; margin: 0; "> * a string.</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; "> OBJ_CUSTOM = (1 << 6),</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'd add a note here stating that OBJ_CUSTOM and OBJ_POINTER are mutually exclusive options.</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;">Will do</pre>
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<p style="margin-top: 0;">On April 15th, 2011, 11:10 p.m., <b>Mark Michelson</b> wrote:</p>
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<a href="https://reviewboard.asterisk.org/r/1184/diff/1/?file=16172#file16172line646" style="color: black; font-weight: bold; text-decoration: underline;">/trunk/main/astobj2.c</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; ">static void *internal_ao2_callback(struct ao2_container *c,</pre></td>
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<td bgcolor="#ffffff" width="50%"><pre style="font-size: 8pt; line-height: 140%; margin: 0; "> * XXX this can be optimized.</pre></td>
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<td bgcolor="#ffffff" width="50%"><pre style="font-size: 8pt; line-height: 140%; margin: 0; "> * XXX this can be optimized.</pre></td>
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<td bgcolor="#ffffff" width="50%"><pre style="font-size: 8pt; line-height: 140%; margin: 0; "> * If we have a hash function and lookup by pointer,</pre></td>
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<td bgcolor="#ffffff" width="50%"><pre style="font-size: 8pt; line-height: 140%; margin: 0; "> * If we have a hash function and lookup by pointer,</pre></td>
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<td bgcolor="#ffffff" width="50%"><pre style="font-size: 8pt; line-height: 140%; margin: 0; "> * run the hash function. Otherwise, scan the whole container</pre></td>
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<td bgcolor="#ffffff" width="50%"><pre style="font-size: 8pt; line-height: 140%; margin: 0; "> * run the hash function. Otherwise, scan the whole container</pre></td>
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<td bgcolor="#ffffff" width="50%"><pre style="font-size: 8pt; line-height: 140%; margin: 0; "> * (this only for the time being. We need to optimize this.)</pre></td>
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<td bgcolor="#ffffff" width="50%"><pre style="font-size: 8pt; line-height: 140%; margin: 0; "> * (this only for the time being. We need to optimize this.)</pre></td>
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<td bgcolor="#ffffff" width="50%"><pre style="font-size: 8pt; line-height: 140%; margin: 0; "> */</pre></td>
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<td bgcolor="#ffffff" width="50%"><pre style="font-size: 8pt; line-height: 140%; margin: 0; "> */</pre></td>
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<td bgcolor="#fdfebc" width="50%"><pre style="font-size: 8pt; line-height: 140%; margin: 0; "> if ((flags & OBJ_POINTER)) /* we know hash can handle this case */</pre></td>
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<td bgcolor="#fdfebc" width="50%"><pre style="font-size: 8pt; line-height: 140%; margin: 0; "> if ((flags & <span class="hl">(</span>OBJ_POINTER<span class="hl"> | OBJ_CUSTOM)</span>)) /* we know hash can handle this case */</pre></td>
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<td bgcolor="#fdfebc" width="50%"><pre style="font-size: 8pt; line-height: 140%; margin: 0; "> start = i = c->hash_fn(arg, flags & OBJ_POINTER) % c->n_buckets;</pre></td>
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<td bgcolor="#fdfebc" width="50%"><pre style="font-size: 8pt; line-height: 140%; margin: 0; "> start = i = c->hash_fn(arg, flags & <span class="hl">(</span>OBJ_POINTER<span class="hl"> | OBJ_CUSTOM)</span>) % c->n_buckets;</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;">Somewhere before here, you should add an ast_assert() to be sure that this hasn't been called with both OBJ_POINTER and OBJ_CUSTOM set.</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;">good idea, will do</pre>
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<p style="margin-top: 0;">On April 15th, 2011, 11:10 p.m., <b>Mark Michelson</b> wrote:</p>
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<a href="https://reviewboard.asterisk.org/r/1184/diff/1/?file=16172#file16172line804" style="color: black; font-weight: bold; text-decoration: underline;">/trunk/main/astobj2.c</a>
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<td bgcolor="#fdfebc" width="50%"><pre style="font-size: 8pt; line-height: 140%; margin: 0; ">void *__ao2_find_debug(struct ao2_container *c, void *arg, enum search_flags flags, char *tag, char *file, int line, const char *funcname)</pre></td>
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<td bgcolor="#fdfebc" width="50%"><pre style="font-size: 8pt; line-height: 140%; margin: 0; ">void *__ao2_find_debug(struct ao2_container *c,<span class="hl"> const</span> void *arg, enum search_flags flags, char *tag, char *file, int line, const char *funcname)</pre></td>
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<td bgcolor="#ffffff" width="50%"><pre style="font-size: 8pt; line-height: 140%; margin: 0; ">{</pre></td>
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<td bgcolor="#ffffff" width="50%"><pre style="font-size: 8pt; line-height: 140%; margin: 0; ">{</pre></td>
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<td bgcolor="#fdfebc" width="50%"><pre style="font-size: 8pt; line-height: 140%; margin: 0; "> return __ao2_callback_debug(c, flags, c->cmp_fn, arg, tag, file, line, funcname);</pre></td>
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<td bgcolor="#fdfebc" width="50%"><pre style="font-size: 8pt; line-height: 140%; margin: 0; "> return __ao2_callback_debug(c, flags, c->cmp_fn, <span class="hl">(void *) </span>arg, tag, file, line, funcname);</pre></td>
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<td bgcolor="#fdfebc" width="50%"><pre style="font-size: 8pt; line-height: 140%; margin: 0; ">void *__ao2_find(struct ao2_container *c, void *arg, enum search_flags flags)</pre></td>
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<td bgcolor="#fdfebc" width="50%"><pre style="font-size: 8pt; line-height: 140%; margin: 0; ">void *__ao2_find(struct ao2_container *c, <span class="hl">const </span>void *arg, enum search_flags flags)</pre></td>
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<td bgcolor="#fdfebc" width="50%"><pre style="font-size: 8pt; line-height: 140%; margin: 0; "> return __ao2_callback(c, flags, c->cmp_fn, arg);</pre></td>
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<td bgcolor="#fdfebc" width="50%"><pre style="font-size: 8pt; line-height: 140%; margin: 0; "> return __ao2_callback(c, flags, c->cmp_fn, <span class="hl">(void *) </span>arg);</pre></td>
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<td bgcolor="#ffffff" width="50%"><pre style="font-size: 8pt; line-height: 140%; margin: 0; ">}</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'm not sure why you would add the const qualifier just to immediately cast to non-const. The better idea here would be to change to const across the board since the arg should be const, but I know that would mean touching a LOT of files. For now, just revert to taking a non-const.
EDIT: Okay, I see what's up now. You did this because changing to using OBJ_CUSTOM resulted in passing const structures to ao2_find and ao2_callback, and this was necessary in order to compile. I still think the long-term fix of adding const all over is better, but I understand that would be a lot of work for an idea that may get rejected by your reviewers :)</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;">Yep, in your EDIT you described exactly why I did this. If you add const to ao2_callback(), the changes get much more invasive since it affects all ao2_callback() users (and there are a bunch of them). Also, the only place arg ends up being used is to pass it in to the hash function, and its argument is const.</pre>
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<p>- Russell</p>
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<p>On April 15th, 2011, 2:02 p.m., 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 2011-04-15 14:02:18</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;">There is a fairly common pattern making its way through the code base where we put a temporary object on the stack so we can call ao2_find() with OBJ_POINTER. The purpose is so that it can be passed into the object hash function. However, this really seems like a hack and potentially error prone. This patch is a first stab at approach to avoid having to do that.
It adds a new flag, OBJ_CUSTOM, which can be used instead of OBJ_POINTER in these situations. Then, the hash function can know whether it was given an object or some custom data to hash.
The patch also changes some uses of ao2_find() for iax2_user and iax2_peer objects to reflect how OBJ_CUSTOM would be used.</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;">It compiles. I'm just throwing out the idea right now. If people seem to think it makes sense, I will certainly try calls before committing anything.</pre>
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<h1 style="color: #575012; font-size: 10pt; margin-top: 1.5em;">Diffs</b> </h1>
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<li>/trunk/channels/chan_iax2.c <span style="color: grey">(313901)</span></li>
<li>/trunk/include/asterisk/astobj2.h <span style="color: grey">(313901)</span></li>
<li>/trunk/main/astobj2.c <span style="color: grey">(313901)</span></li>
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<p><a href="https://reviewboard.asterisk.org/r/1184/diff/" style="margin-left: 3em;">View Diff</a></p>
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