Hi guys,
I'm writing an apache module in C using EAPI that
comes with mod_ssl.
My module caches info in the array of structs that
is allocated from shared memory resource pool like
so:
/* globals */
static array_header *cache;
static pool *sp;
/* my struct */
typedef struct {
..
char *info;
char *timestamp;
..
} mystruct;
/* module_init function */
static void module_init(server_rec *s, pool *p)
{
sp = ap_make_shared_sub_pool(p);
cache = ap_make_array(sp, 0, sizeof(mystruct));
}
In my request handler I add/read elements from
my cache array. Now the problem is, I need to be able to
delete from my cache array in shared memory "old" elements
(eg. timestamp > N seconds) so that my cache doesnt become
huge and eat-up all my RAM...
Since apache doesnt provide an easy way of popping out
elements from its arrays here is what I tried to do
to achieve that
1) create a temporary array TEMPO
from r->pool and copy in there all the elements
from cache array that I want to keep
2) call ap_clear_pool(sp) on my shared memory pool to
destroy its content.
3) Re-create an empty array in shared memory again
cache = ap_make_array(sp, 0, sizeof(mystruct))
4) Push into my newly recreated array all elements from temporary
array.
Note: In my code I always remember to set and release lockes whenever I
read/write into my shared pool.
Now obviously if my program worked flawlessly I wouldn't we writing this
email ;o)
After about thousand requests my apache children start seg-faulting
and I start getting this error "Ouch! malloc failed in malloc_block()".
Im 100% sure the problem is caused by me tring to free up memory
in shared pool when I re-create my cache array in there, because
if I skip that part and only add elements into my cache my
program works perfectly... of course my available shared memory is getting
smaller and smaller in that case.
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