Memory pool allocator in C without using built-in malloc() and free() functions

[@revanthrajashekar5983]

In the function my_free , heap_small[ALLOC_CNT] and heap_large[ALLOC_CNT], both are OOB. It needs to be ALLOC_CNT - 1.

[@ravishankar7972]

Upon trying this implementation I also found that it is not necessarily the array base address be 32 bytes aligned or 128 bytes. So the mod of address might not necessarily be 0.

[@ravishankar7972]

Doesn’t the update to the bool array or bitmap need to be atomic?

[@karthickNarayanan]

in free function should the ptr be subtracted from base address of addr and then we should do Modulo ?

[@ravishankarnolastname1917]

yes, that's a bug in the code.

[@galalroy]

Possible solution
for (int i = 0; i < ALLOC_CNT; i++) {
if (ptr == (void*)heap_small[i]) {
used_small[i] = false;
break;
}
if (ptr == (void*)heap_large[i]) {
used_large[i] = false;
break;
}
}

[@galalroy]

your my_free func have critical bug if (addr % HEAP_SMALL == 0) never happen