Re: Code questions (strings and other things)

[Dave D. <dde...@es...>]

Ethan Merritt <merritt@u.washington.edu> writes:

>> 
>> In what sense do you mean the memory use code dies dramatically?
>
> If you enable CHECK_HEAP_USE, then gnuplot redefines  free()
> to be an internal function 
> 	# define free(x) checked_free(x)
>
> gp_alloc() allocates extra space and puts a checksum in the allocated
> chunk of memory, which is checked when it is freed.
> If the chuck was allocated directly with malloc() rather than gp_alloc()
> then it doesn't contain this padding, and the attempt to validate this
> "extra" space in the allocated chunk produces a segfault.
>
>> PS:  Why isn't gpfree, gp_free; consistent with gp_alloc, etc.?
>
> I wondered that as well.
>

It was a long time ago, but my guess is I was looking for some
particular leak or scribble, and the code was already using a
gp_alloc() wrapper, but was using free() directly. As a quick hack,
redefining free() was enough for what I was trying to do.


dd
-- 
Dave Denholm              <dde...@es...>       http://www.esmertec.com