>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 <j...@rtems.org> Date: Wed, 8 Sept 2021 at 20:30 Subject: Re: Ticket 4503 To: Gedare Bloom <ged...@rtems.org> Cc: zack leung <zakthertems...@gmail.com>, rtems-de...@rtems.org < devel@rtems.org> On Wed, Sep 8, 2021 at 11:02 AM Gedare Bloom <ged...@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 <zakthertems...@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@rtems.org >> http://lists.rtems.org/mailman/listinfo/devel > >
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