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["Brian A. Knudsen" <brian@...>]

-----Oprindelig meddelelse-----
Fra: owner-lua-l@tecgraf.puc-rio.br
[mailto:owner-lua-l@tecgraf.puc-rio.br] På vegne af Thatcher Ulrich
Sendt: 29. oktober 2002 22:14
Til: Multiple recipients of list
Emne: Re: Garbage collection


On Oct 29, 2002 at 02:53 -0000, tom7ca wrote:
> [snip]

I think David answered your previous points better than I can; I just
want to pick up on the API issue...

> And reference counting is certainly not a good default allocation 
> strategy for Lua because it's inefficient and a pain to use from a C 
> API.  Reference counting is probably the worst part of, for example, 
> the Python implementation.

OK, that may well be true; I haven't used the Python API.

But, it seems to me that the existing Lua reference-locking API is
completely agnostic about how the internal Lua GC operates.  See:

http://www.lua.org/manual/manual.html#5.14

Basically, a C program declares that it is interested in a particular
object, using the lua_ref() call.  lua_ref() returns a integer handle,
for use in retrieving the reference.  The C program calls lua_getref()
with the handle, to put the physical reference to the object on the Lua
stack.  When the C program no longer needs access to that object, it
frees the handle using lua_unref().

No details about the underlying GC implementation are exposed; ref
counting can work just as well as anything else behind this interface.

-- 
Thatcher Ulrich
http://tulrich.com