Re: stumped by scm_car/scm_cdr

[Marius Vollmer]

Han-Wen Nienhuys <address@hidden> writes:

> address@hidden writes:
>> Han-Wen Nienhuys <address@hidden> writes:
>> 
>> > I've added a check to scm_cell/scm_double_cell that calls abort() if
>> > GC is running.
>> 
>> Well, OK.  Another idea is to set the freelists to NULL during GC
>> explicitely, thus causing scm_cell etc to call scm_gc_for_newcell
>> immediately, and scm_gc_for_newcell could then check whether the GC is
>> already running.  That would not make scm_cell etc slower for the
>> usual case that the GC is in fact not running.  Could you try that
>> variant?
>
> I tried to look at this, but scm_i_freelist is now a thread-specific
> variable. I'm unsure if and how they should all be set to null or
> SCM_EOL.

Only the scm_i_freelist of the thread actually doing the garbage
collection needs to be set, I think.  All other threads are stopped at
that time and can't allocate storage.