X-Git-Url: http://git.megacz.com/?a=blobdiff_plain;f=ghc%2Frts%2FWeak.c;h=60325199cc49dba30d7d7c3d830906ed4dda538f;hb=8813f77032fc4898a908fa63f75e21de32a0b072;hp=5f038db6d3dcd9b5161805c4fb2fb2f70d7ee13a;hpb=a6b16f2cac06c9583c362bad0416886a3a7bf85c;p=ghc-hetmet.git

diff --git a/ghc/rts/Weak.c b/ghc/rts/Weak.c
index 5f038db..6032519 100644
--- a/ghc/rts/Weak.c
+++ b/ghc/rts/Weak.c
@@ -1,7 +1,9 @@
 /* -----------------------------------------------------------------------------
- * $Id: Weak.c,v 1.5 1999/02/01 18:05:35 simonm Exp $
+ * $Id: Weak.c,v 1.10 1999/02/26 13:36:14 simonm Exp $
  *
- * Weak pointers / finalisers
+ * (c) The GHC Team, 1998-1999
+ *
+ * Weak pointers / finalizers
  *
  * ---------------------------------------------------------------------------*/
 
@@ -14,59 +16,57 @@
 StgWeak *weak_ptr_list;
 
 /*
- * finaliseWeakPointersNow() is called just before the system is shut
- * down.  It runs the finaliser for each weak pointer still in the
+ * finalizeWeakPointersNow() is called just before the system is shut
+ * down.  It runs the finalizer for each weak pointer still in the
  * system.
+ *
+ * Careful here - rts_evalIO might cause a garbage collection, which
+ * might change weak_ptr_list.  Must re-load weak_ptr_list each time
+ * around the loop.
  */
 
 void
-finaliseWeakPointersNow(void)
+finalizeWeakPointersNow(void)
 {
   StgWeak *w;
-
-  for (w = weak_ptr_list; w; w = w->link) {
+  
+  while ((w = weak_ptr_list)) {
+    weak_ptr_list = w->link;
     IF_DEBUG(weak,fprintf(stderr,"Finalising weak pointer at %p -> %p\n", w, w->key));
     w->header.info = &DEAD_WEAK_info;
-    if (w->finaliser != &NO_FINALISER_info) {
-      rts_evalIO(w->finaliser,NULL);
+    if (w->finalizer != &NO_FINALIZER_closure) {
+      rts_evalIO(w->finalizer,NULL);
     }
   }
 } 
 
 /*
- * scheduleFinalisers() is called on the list of weak pointers found
+ * scheduleFinalizers() is called on the list of weak pointers found
  * to be dead after a garbage collection.  It overwrites each object
- * with DEAD_WEAK, and creates a new thread for the finaliser.
+ * with DEAD_WEAK, and creates a new thread for the finalizer.
+ *
+ * This function is called just after GC.  The weak pointers on the
+ * argument list are those whose keys were found to be not reachable,
+ * however the value and finalizer fields have by now been marked live.
+ * The weak pointer object itself may not be alive - i.e. we may be
+ * looking at either an object in from-space or one in to-space.  It
+ * doesn't really matter either way.
  */
 
 void
-scheduleFinalisers(StgWeak *list)
+scheduleFinalizers(StgWeak *list)
 {
   StgWeak *w;
   
   for (w = list; w; w = w->link) {
     IF_DEBUG(weak,fprintf(stderr,"Finalising weak pointer at %p -> %p\n", w, w->key));
-    if (w->finaliser != &NO_FINALISER_info) {
+    if (w->finalizer != &NO_FINALIZER_closure) {
 #ifdef INTERPRETER
-      createGenThread(RtsFlags.GcFlags.initialStkSize, w->finaliser);
+      createGenThread(RtsFlags.GcFlags.initialStkSize, w->finalizer);
 #else
-      createIOThread(RtsFlags.GcFlags.initialStkSize, w->finaliser);
+      createIOThread(RtsFlags.GcFlags.initialStkSize, w->finalizer);
 #endif
     }
     w->header.info = &DEAD_WEAK_info;
   }
 }
-
-void
-markWeakList(void)
-{
-  StgWeak *w, **last_w;
-
-  last_w = &weak_ptr_list;
-  for (w = weak_ptr_list; w; w = w->link) {
-    w = (StgWeak *)MarkRoot((StgClosure *)w);
-    *last_w = w;
-    last_w = &(w->link);
-  }
-}
-