• State Not Answered
  • Locked Locked
  • Replies 6 replies
  • Subscribers 15 subscribers
  • Views 3650 views
  • Users 0 members are here
Options
Related
How was your experience today?
This discussion has been locked.
You can no longer post new replies to this discussion. If you have a question you can start a new discussion

Memory Pool (malloc/free) Free Space?

Bryan Green

Quite simply, how can I tell how much free memory I have in a memory pool?

I've created a memory pool, initialized it with init_mempool and use malloc & free finctions for memory management.

Is there a simple way to find out how much memory is still available to be allocated?

I have a fairly dynamic application and I would like to insert some degugging triggers if memory gets low.

I thought of simply using malloc to request a block of say 200 bytes and then free it again. Could do this once a second and generate a low memory error if it fails. Seems a bit clunky, is there an easier way that I have missed??

Thanks,
Bryan Green.

Parents
  • 0

    Bryan,

    I haven't tested this, but the following function should do what you want.

    long alloc_ttl, alloc_max;

void available_alloc (void)
{
struct __mp__ MTYP *q;

alloc_ttl = 0;
alloc_max = 0;

q = (struct __mp__ MTYP *) &__mp__;
q = q->next;

while (q)
  {
  alloc_ttl += q->len;
  if (alloc_max < q->len) allox_max = q->len;
  q = q->next;
  }
}

    If you look at the source for malloc, you'll see how it works.

    Jon

Reply
  • 0

    Bryan,

    I haven't tested this, but the following function should do what you want.

    long alloc_ttl, alloc_max;

void available_alloc (void)
{
struct __mp__ MTYP *q;

alloc_ttl = 0;
alloc_max = 0;

q = (struct __mp__ MTYP *) &__mp__;
q = q->next;

while (q)
  {
  alloc_ttl += q->len;
  if (alloc_max < q->len) allox_max = q->len;
  q = q->next;
  }
}

    If you look at the source for malloc, you'll see how it works.

    Jon

Children