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Re: A beginner is playing with memory pools


Matthieu.GIRARDIN@fr.thalesgroup.com wrote:
Hello everybody,

Sorry to disturb you. I can imagine you're busy as I am but I've a lack of
knowledge about memory pool.
So if someone would answer my questions, it would be great. Thanks by
advance.

I want to use cyg_mempool_fix_create().
Do I need to allocate a memory zone with a malloc BEFORE to use this
function ?

Yes you need to already have the space to use preallocated and pass it in. But tt seems wasteful to use malloc for this though! Just static char mempool[100*1024]; or something will do.


If I must do it, I think the parametre called "base" might be the address of
this zone, no ?
And if I must allocate BEFORE, what the existing reason of the parametre
size ?

So it knows how big that area that's been allocated is of course!


Another thing, what's the last parametre ? I didn't understand because we
use a cyg-handle_t in the other associated functions (cyg_mempool_fix_alloc
...)

It's the space for the memory pool metadata. For example, do something like:


static cyg_mempool_fix mymempool;
static char mempoolspace[100*1024];
static cyg_handle_t h;

cyg_mempool_fix_create( mempoolspace, sizeof(mempoolspace), 64, &h, &mymempool);

I'm sorry but I've not enough documentation to understand all this ecos
object ...

Yes it accidently wasn't included in a documentation rewrite. This may help: http://ecos.sourceware.org/ecos/docs-1.3.1/ref/ecos-ref.9.html#36601


Jifl
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