Ticket 4503

[zack leung]

bump

On Mon, 18 Oct 2021 at 23:58, zack leung <zakthertemsdev at gmail.com> wrote:

> bump
>
>
> On Sat, 25 Sept 2021 at 00:26, zack leung <zakthertemsdev at gmail.com>
> wrote:
>
>> bump
>>
>> On Thu, 9 Sept 2021 at 02:17, zack leung <zakthertemsdev at gmail.com>
>> wrote:
>>
>>> >Thanks! I guess i'm really unsure about how the pointer relates to the
>>> amount of memory that you can use. I assume the Malloc keeps track of the
>>> sections being used in the heap. Does this function Allocate 2 blocks since
>>> the pointer is set to
>>>
>>> (uintptr_t) next_block + HEAP_ALLOC_BONUS - alloc_begin;
>>>
>>> >(I know it's a bit naive to assume this given my first question)
>>>
>>> think the method is _Heap_Size_of_alloc_area. It may need a wrapper
>>> added to the protected heap wrapper for safety. I don't know if it has one.
>>> It should be the equivalent functionality.
>>> > How would i implement a wrapper and what safety measures need to be
>>> implemented. So far it's checking if :  the block is not in the heap and if
>>> it's been previously used. Is the usable memory in the heap calculated by:
>>> the size of the block * # of blocks?
>>>
>>> Thanks, Zack
>>>
>>> ---------- Forwarded message ---------
>>> From: Joel Sherrill <joel at rtems.org>
>>> Date: Wed, 8 Sept 2021 at 20:30
>>> Subject: Re: Ticket 4503
>>> To: Gedare Bloom <gedare at rtems.org>
>>> Cc: zack leung <zakthertemsdev at gmail.com>, rtems-devel at rtems.org <
>>> devel at rtems.org>
>>>
>>>
>>>
>>>
>>> On Wed, Sep 8, 2021 at 11:02 AM Gedare Bloom <gedare at rtems.org> wrote:
>>>
>>>> Hi Zack,
>>>>
>>>> https://devel.rtems.org/ticket/4503
>>>>
>>>> The malloc implementation exists in the score as the Heap Manager.
>>>> search for "Heap_" within cpukit to get some ideas where to look.
>>>>
>>>
>>> I think the method is _Heap_Size_of_alloc_area. It may need a wrapper
>>> added to the protected heap wrapper for safety. I don't know if it has one.
>>> It should be the equivalent functionality.
>>>
>>> newlib's malloc.h will need looking at to make sure we provide the right
>>> methods.
>>>
>>>
>>>
>>>>
>>>> @Joel are these two tickets duplicates?
>>>> https://devel.rtems.org/ticket/4503
>>>> https://devel.rtems.org/ticket/4271
>>>>
>>>
>>> Yes. Closed #4271 and merged comments.
>>>
>>> --joel
>>>
>>>
>>>>
>>>>
>>>> -Gedare
>>>>
>>>> On Tue, Sep 7, 2021 at 7:14 PM zack leung <zakthertemsdev at gmail.com>
>>>> wrote:
>>>>
>>>>> I was wondering about ticket 4503. I was wondering where The required
>>>>> functionality should be in the underlying score/ capability used can be
>>>>> found to write this function. Also how does this relate  to
>>>>>
>>>>> Add common malloc family extension method malloc_usable_size()
>>>>> <https://devel.rtems.org/ticket/4271>?
>>>>> Thanks
>>>>> Zack
>>>>> _______________________________________________
>>>>> devel mailing list
>>>>> devel at rtems.org
>>>>> http://lists.rtems.org/mailman/listinfo/devel
>>>>
>>>>