[asterisk-dev] [Code Review]: Resolve odbc segfaults by adding shared locks around usage of odbc handle in res_odbc

[wdoekes]

> On Feb. 8, 2012, 2:33 a.m., wdoekes wrote:
> > /branches/1.8/include/asterisk/res_odbc.h, line 160
> > <https://reviewboard.asterisk.org/r/1719/diff/1/?file=23900#file23900line160>
> >
> >     +1 on the _wrlocked suffix. It beats '2' any single day.
> 
> Tilghman Lesher wrote:
>     I don't really agree with that.  The problem comes to any new developer who sees a host of different APIs and wonders which one is the latest.  Adding a '2' makes it very clear that it's a later version of the function.  I'd also prefer if the underlying 2-argument function were exposed, instead of hiding it (and thus permitting new users to pass either 1 or 0 themselves), instead of doubling the number of APIs they need to remember.

If you put it like that, sure. But that only makes sense if your second preference is met; exposing the lock_type integer. And in this case, we'd have to know which integer means what (was 0 unlocked or readlocked?), which means adding defines or enums which we have to keep track of.

Having said that, I wonder why the function is exposed at all. No one outside res_odbc is using it, except perhaps 3rd party callers? And I believe you already pointed out that we're already breaking things for them: they won't have the read-lock on it at all.


- wdoekes


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On Feb. 8, 2012, 8:47 a.m., jrose wrote:
> 
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> 
> (Updated Feb. 8, 2012, 8:47 a.m.)
> 
> 
> Review request for Asterisk Developers, Mark Michelson, Tilghman Lesher, rmudgett, and wdoekes.
> 
> 
> Summary
> -------
> 
> This is a continuation of wdoekes patch seen in https://reviewboard.asterisk.org/r/1622/
> This adds Tilghman Lesher's suggested changes.
> 
> 
> This addresses bug ASTERISK-19011.
>     https://issues.asterisk.org/jira/browse/ASTERISK-19011
> 
> 
> Diffs
> -----
> 
>   /branches/1.8/res/res_odbc.c 354164 
>   /branches/1.8/include/asterisk/res_odbc.h 354164 
> 
> Diff: https://reviewboard.asterisk.org/r/1719/diff
> 
> 
> Testing
> -------
> 
> 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.
> 
> 
> Thanks,
> 
> jrose
> 
>

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