[M3commit] CVS Update: cm3

[Tony Hosking]

It is precise re traced refs.  That's the lowest frame that can hold a traced reference.

On 22 Nov 2009, at 16:53, Jay K wrote:

> The end of the stack isn't precise:
>  
> C:\dev2\cm3.release_branch_cm3_5_8\m3-libs\m3core\src\thread\POSIX\ThreadPosix.m3(1058):    self.stackbase := ADR(xx);
>  
> "stack" here:
>  
> void
> ProcessContext(Context *c, void *stack,
>         void (*p) (void *start, void *stop))
> {
>   if (stack < c->uc.uc_stack.ss_sp)
>     p(stack, c->uc.uc_stack.ss_sp);
>   else
>     p(c->uc.uc_stack.ss_sp, stack);
> #ifdef __APPLE__
>   p(&(c->uc.uc_mcontext[0]), &(c->uc.uc_mcontext[1]));
> #else
>   p(&c[0], &c[1]);
> #endif
> }
> 
>  - Jay
> 
>  
> > From: hosking at cs.purdue.edu
> > Date: Sun, 22 Nov 2009 13:41:26 -0500
> > To: jkrell at elego.de
> > CC: m3commit at elegosoft.com
> > Subject: Re: [M3commit] CVS Update: cm3
> > 
> > > Note that ThreadPosix.m3 could also implement such precise stackbase.
> > 
> > ThreadPosix *does* implement a precise stack base. It's obtained from the ucontext set in the thread switch routine (swapcontext).
> > 
> > > ThreadPThread.m3 probably often could, like with the functions on OpenBSD (broken) and FreeBSD, etc.
> > 

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