[ECOS] Re: thread_create stack base=NULL or size=0?

Grant Edwards grante@visi.com
Thu Apr 16 06:56:00 GMT 2009


On 2009-04-15, Nick Garnett <nickg@ecoscentric.com> wrote:
>  Grant Edwards <grante@visi.com> writes:
>
>> Can somebody explain the behavior of cyg_thread_create when the
>> stack-base is NULL or when a stack-size is 0?
>
> In the original design it was intended that there be an option
> to allow the kernel to malloc all data structures, including
> thread stacks (which may have had a default size, selected by
> zero). This is why the object structure is passed in as the
> last argument, and we return a "handle", which is just a copy
> of the structure address.
>
> Ultimately we decided not to do that and make the user supply
> all memory. However, the API features for this remained, and
> comments were left in the code.

Thanks.  Now I don't feel so bad about not being able to figure
out how that feature was implemented in the C++ source code.

[Though I should know by now not to pay much attention to comments.]

-- 
Grant Edwards                   grante             Yow! You can't hurt me!!
                                  at               I have an ASSUMABLE
                               visi.com            MORTGAGE!!


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