On Wed, 14 Aug 2019 at 15:08, Les Newell <les.new...@fastmail.co.uk> wrote:
> I am working on a hal module that may need a variable amount of memory > depending on it's configuration. Is it acceptable to use malloc in a hal > module? Should I use hal_malloc or is that specifically for pins? As I understand it, hal_malloc is meant for allocating shared memory. If your module does not need to share data then I think that conventional malloc can be used. However I don't see much evidence that it is in any hal components, but it is in some of the hal drivers. (I don't have access to a Linuxcnc repository at the moment other than github, and that has the worst search in the world, so I can't easily check properly). hal_malloc itself has a comment: https://github.com/LinuxCNC/linuxcnc/blob/1db55cf2187a654e378f771050ac5e825533e316/src/hal/hal.h#L192 During EXTRA_SETUP you can use extra_arg to get the instance index being processed. It may be that extra_arg is also passed to EXTRA_CLEANUP for the same reason. -- atp "A motorcycle is a bicycle with a pandemonium attachment and is designed for the especial use of mechanical geniuses, daredevils and lunatics." — George Fitch, Atlanta Constitution Newspaper, 1916 _______________________________________________ Emc-developers mailing list Emc-developers@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-developers
