[PATCH 5/9] New probe type: DTrace USDT probes.

Sergio Durigan Junior sergiodj@redhat.com
Fri Oct 10 18:44:00 GMT 2014

On Friday, October 10 2014, Jose E. Marchesi wrote:

>     >     You should free the enablers VEC in the end of the function.  You could
>     >     probably make a cleanup and call it later.
>     >
>     > Hmm, I don't see the need of doing a deep copy of the vector, nor I
>     > remember why I felt it was necessary to do it when I wrote the original
>     > code.
>     >
>     > I changed that to:
>     >
>     > /* Add the vector of enablers to this probe, if any.  */
>     > ret->enablers = enablers;
>     >
>     > But maybe(probably) I am missing something? :?
>     Hm, right.  But if you do that, you will have to adjust
>     dtrace_probe_destroy, because it will be freeing the same 'enablers'
>     over and over...
> Aaah, that was indeed the reason!  A "DOF probe" translates into 0 or
> more gdb probes, and they all share the same vector of enablers.
> Maintaining a copy of the enablers per gdb probe makes it trivial to
> manage its memory.  Otherwise we would need to keep track of which
> enabler vectors are shared by which gdb probes... argh!
> I will roll back to the deep copy approach :)


And then you need that cleanup I mentioned before :-P.

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