1 /* -----------------------------------------------------------------------------
2 * $Id: Weak.c,v 1.9 1999/02/26 12:43:58 simonm Exp $
4 * (c) The GHC Team, 1998-1999
6 * Weak pointers / finalizers
8 * ---------------------------------------------------------------------------*/
16 StgWeak *weak_ptr_list;
19 * finalizeWeakPointersNow() is called just before the system is shut
20 * down. It runs the finalizer for each weak pointer still in the
23 * Careful here - rts_evalIO might cause a garbage collection, which
24 * might change weak_ptr_list. Must re-load weak_ptr_list each time
29 finalizeWeakPointersNow(void)
33 while ((w = weak_ptr_list)) {
34 weak_ptr_list = w->link;
35 IF_DEBUG(weak,fprintf(stderr,"Finalising weak pointer at %p -> %p\n", w, w->key));
36 w->header.info = &DEAD_WEAK_info;
37 if (w->finalizer != &NO_FINALIZER_closure) {
38 rts_evalIO(w->finalizer,NULL);
44 * scheduleFinalizers() is called on the list of weak pointers found
45 * to be dead after a garbage collection. It overwrites each object
46 * with DEAD_WEAK, and creates a new thread for the finalizer.
50 scheduleFinalizers(StgWeak *list)
54 for (w = list; w; w = w->link) {
55 IF_DEBUG(weak,fprintf(stderr,"Finalising weak pointer at %p -> %p\n", w, w->key));
56 if (w->finalizer != &NO_FINALIZER_closure) {
58 createGenThread(RtsFlags.GcFlags.initialStkSize, w->finalizer);
60 createIOThread(RtsFlags.GcFlags.initialStkSize, w->finalizer);
63 w->header.info = &DEAD_WEAK_info;
72 last_w = &weak_ptr_list;
73 for (w = weak_ptr_list; w; w = w->link) {
74 w = (StgWeak *)MarkRoot((StgClosure *)w);