[M3devel] solaris RTThread__Transfer?

[Tony Hosking]

Sorry, I had mis-remembered that code as using swapcontext, which it  
clearly does not.

I seem to recall that the longjmp emulation was necessary for some  
reason, but I forget why right now.  Was Transfer being called from  
some place as if it was a longjmp?

Hmm...

It's been 10 years since I wrote that code for the Solaris port... ;-)

On 2 Feb 2009, at 01:11, Jay wrote:

>
> SOLgnu/SOLsun have this:
>
> void RTThread__Transfer (ucontext_t *from, ucontext_t *to)
> {
>  if (getcontext(from) == 0) {
>    to->uc_mcontext.gregs[REG_O0] = (greg_t)1; /* emulate longjmp  
> return */
>    setcontext(to);  /* fire it up */
>  }
> }
>
> Two questions:
> The longjmp emulation is unnecessary, right? (and platform specific)
> getcontext + setcontext could just be swapcontext, right?
>
>
> Specifically, the "entire function" could "just" be: (yeah yeah,  
> only a slight reduction).
>
>
> void RTThread__Transfer (ucontext_t *from, ucontext_t *to)
> {
>  swapcontext(from, to);
> }
>
>
> or even
>
>
> RTThread.i3
> PROCEDURE Transfer(...);
>
>
> Yes, I notice the error checking, but a) why would it ever fail b)  
> is that really complete anyway?
> Just silently ignore the error?
>
>
> ?
> - Jay