Roam Black came up with what looks like a god one too:

http://www.romanblack.com/PICthread.htm

I haven't used it personally yet  but keep the link handy in case I ever
need it.
I have always admired and trusted his code so if anyone has used his
implementation the feedback would be useful.

Cheers
Chris



On 19 April 2013 15:16, Mike <mikerj@clara.net> wrote:

> veegee <veegee <at> veegee.org> writes:
>
> >
> > On 2013-04-18 10:59 AM, Joe Wronski wrote:
> > > Having never worked with any RTOS due to ROM and RAM limitations, I
> find
> > > Protothreads fascinating.    Where my cow-orkers and I had hand craft=
ed
> > > state machines which closely resembled the Protothreads expanded
> macros,
> > > using PT would have made the code more readable and maintainable.  I
> had
> > > never considered using the __LINE__ macro for anything other than
> > > compiler error and warning info.  And I never realized that you could
> > > put the case : argument of a switch within a while loop (Duff's
> Device).
> >
> > Yup, C switches behave somewhat like labels. The cases are valid
> > anywhere within the switch.
> >
> >
>
> Note that using Protothreads vs "hand crafted" state machines has a
> potential disadvantage.  The __LINE__ macro will produce case values that
> will almost certainly me non-consecutive and which quite probably need 16
> bits to represent.  This may prevent the switch statement being implement=
ed
> as a jump table, and the larger data types on an 8 bit micro will slow
> things down and increase memory size.
>
> Cheers
>
> Mike
>
>
>
>
> --
> http://www.piclist.com/techref/piclist PIC/SX FAQ & list archive
> View/change your membership options at
> http://mailman.mit.edu/mailman/listinfo/piclist
>
--=20
http://www.piclist.com/techref/piclist PIC/SX FAQ & list archive
View/change your membership options at
http://mailman.mit.edu/mailman/listinfo/piclist
.