🚀 go-pugleaf

In article <1992Aug7.155554.9342@cs.kuleuven.ac.be> bimbart@cs.kuleuven.ac.be (Bart Demoen) writes:

   [...]

   Garbage collection has to deal with 3 types of permanent variables

	   initialized and active (1)
	   initialized and no longer active (2)
	   not yet initialized (3)

   [...]

   (1) poses no problem

   There are at least three ways to take care of (3):

   1. at the first call, initialize the ones that are not yet active;
      it is the SICStus solution Mats described

As I pointed out in my message, initializing the not yet active ones is
not quite enough.

   [...]

   (2) is dealt with in systems with trimming by making the length of the
       environment somehow available to the gc process, often by storing
       this length in *(CP-1)
   SICStus does not trim environments, so perhaps it doesn't collect all garbage ?

All versions of SICStus Prolog do trim environments as in the original
WAM definition.
--
Mats Carlsson
SICS, PO Box 1263, S-164 28  KISTA, Sweden    Internet: matsc@sics.se
Tel: +46 8 7521543     Ttx: 812 6154 7010 SICS     Fax: +46 8 7517230