Re: [TCLCORE] Making Tcl 9 go (way) faster

[Alexandre F. <ale...@gm...>]

On Thu, Nov 22, 2012 at 10:44 AM, Trevor Davel (Twylite)
<tw...@cr...> wrote:
> Another approach may be to have a class of Tcl_Obj that is intended to be shared between interps, and which has performance penalties associated with its management (alloc, free, modify refCount) but not its use (which gets a bit tricky if another thread tries to free it...).

The problem is that even if you define a "global switch" meaning "when
I'm on, disable the local allocator", you may still need to *refer* to
existing values of unconstrained origin:

      set x [expr {rand()}] ;# <- local alloc
      global_alloc_only {
          set l [list foo ... $x ... ] ;# <- global alloc
      }
      ::thread::send $t2 $l

In this case, $l will only be superficially in the proper pool; some
of its element values will still be in the local one.
This means that global_alloc_only is not enough (hence, in this case,
useless ;) :  we need a DeepCloneToGlobalArea.

-Alex