Ticket 4503

[zack leung]

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
>>>
>>>