Re: Properties and readonly objects

Tuesday, 13 April 1999

        Hrvoje Niksic <hniksic(a)srce.hr&gt; writes:

...
 This has been fixed long ago. 
Not good enough. I am pretty sure the x-win-init-sun crash reported
for 21.0.67 is due to this. As I wrote before

...
 	 But purified aggregate objects like lists and vectors can
 	 contain uninterned symbols.  If there are no other non-pure
 	 references to the symbol, then the symbol is not protected
 	 from garbage collection because the collector does not mark
 	 the contents of purified objects. 
This is a good description of the problem

...
 So to protect the symbols,
 	 an impure reference has to be kept for each uninterned symbol
 	 that is referenced by a pure object.  All such symbols are
 	 stored in the hash table pointed to by
 	 Vpure_uninterned_symbol_table, which is itself
 	 staticpro'd. */ 
And this is a good solution

...
       if (NILP (XSYMBOL (obj)->obarray))
 	Fputhash (obj, Qnil, Vpure_uninterned_symbol_table);
       return obj;
     } 
However, this is incomplete. What happens if I unintern it later (as
x-win-init-sun does)? This code needs to set some flag such that
unintern can add it to Vpure_uninterned_symbol_table later.

Jan

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