X-Git-Url: http://git.megacz.com/?a=blobdiff_plain;f=ghc%2Frts%2FWeak.c;h=f0103952212399ca567866428f27390ef0015430;hb=6a710247bc1a7b9bced7a4e6f143de91eb4f9552;hp=7cbf989a64ff9f89f2d807573bb34d18fcacb63d;hpb=34a98f40dea6d31ced5213b7810dc39b4989c395;p=ghc-hetmet.git

diff --git a/ghc/rts/Weak.c b/ghc/rts/Weak.c
index 7cbf989..f010395 100644
--- a/ghc/rts/Weak.c
+++ b/ghc/rts/Weak.c
@@ -1,5 +1,4 @@
 /* -----------------------------------------------------------------------------
- * $Id: Weak.c,v 1.16 2000/11/13 14:40:37 simonmar Exp $
  *
  * (c) The GHC Team, 1998-1999
  *
@@ -7,44 +6,21 @@
  *
  * ---------------------------------------------------------------------------*/
 
+#include "PosixSource.h"
+#define COMPILING_RTS_MAIN
 #include "Rts.h"
-#include "RtsAPI.h"
+#include "RtsUtils.h"
 #include "SchedAPI.h"
 #include "RtsFlags.h"
 #include "Weak.h"
 #include "Storage.h"
+#include "Schedule.h"
 #include "Prelude.h"
+#include "RtsAPI.h"
 
 StgWeak *weak_ptr_list;
 
 /*
- * 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
-finalizeWeakPointersNow(void)
-{
-  StgWeak *w;
-  
-  while ((w = weak_ptr_list)) {
-    weak_ptr_list = w->link;
-    if (w->header.info != &stg_DEAD_WEAK_info) {
-	w->header.info = &stg_DEAD_WEAK_info;
-	IF_DEBUG(weak,fprintf(stderr,"Finalising weak pointer at %p -> %p\n", w, w->key));
-	if (w->finalizer != &stg_NO_FINALIZER_closure) {
-	    rts_evalIO(w->finalizer,NULL);
-	}
-    }
-  }
-} 
-
-/*
  * 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 to run the pending finalizers.
@@ -55,44 +31,67 @@ finalizeWeakPointersNow(void)
  * 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.
+ *
+ * Pre-condition: sched_mutex _not_ held.
  */
 
 void
-scheduleFinalizers(StgWeak *list)
+scheduleFinalizers(Capability *cap, StgWeak *list)
 {
     StgWeak *w;
     StgTSO *t;
     StgMutArrPtrs *arr;
     nat n;
 
-    /* count number of finalizers first... */
-    for (n = 0, w = list; w; w = w->link) { 
-	if (w->finalizer != &stg_NO_FINALIZER_closure)
+    // count number of finalizers, and kill all the weak pointers first...
+    n = 0;
+    for (w = list; w; w = w->link) { 
+
+	// Better not be a DEAD_WEAK at this stage; the garbage
+	// collector removes DEAD_WEAKs from the weak pointer list.
+	ASSERT(w->header.info != &stg_DEAD_WEAK_info);
+
+	if (w->finalizer != &stg_NO_FINALIZER_closure) {
 	    n++;
+	}
+
+#ifdef PROFILING
+        // A weak pointer is inherently used, so we do not need to call
+        // LDV_recordDead().
+	//
+        // Furthermore, when PROFILING is turned on, dead weak
+        // pointers are exactly as large as weak pointers, so there is
+        // no need to fill the slop, either.  See stg_DEAD_WEAK_info
+        // in StgMiscClosures.hc.
+#endif
+	SET_HDR(w, &stg_DEAD_WEAK_info, w->header.prof.ccs);
     }
 	
+    // No finalizers to run?
     if (n == 0) return;
 
-    IF_DEBUG(weak,fprintf(stderr,"weak: batching %d finalizers\n", n));
+    IF_DEBUG(weak,debugBelch("weak: batching %d finalizers\n", n));
 
-    arr = (StgMutArrPtrs *)allocate(sizeofW(StgMutArrPtrs) + n);
+    arr = (StgMutArrPtrs *)allocateLocal(cap, sizeofW(StgMutArrPtrs) + n);
+    TICK_ALLOC_PRIM(sizeofW(StgMutArrPtrs), n, 0);
     SET_HDR(arr, &stg_MUT_ARR_PTRS_FROZEN_info, CCS_SYSTEM);
     arr->ptrs = n;
 
-    for (n = 0, w = list; w; w = w->link) {
+    n = 0;
+    for (w = list; w; w = w->link) {
 	if (w->finalizer != &stg_NO_FINALIZER_closure) {
 	    arr->payload[n] = w->finalizer;
 	    n++;
 	}
-	w->header.info = &stg_DEAD_WEAK_info;
     }
 
-    t = createIOThread(RtsFlags.GcFlags.initialStkSize, 
-		       rts_apply(
-			   rts_apply(
+    t = createIOThread(cap, 
+		       RtsFlags.GcFlags.initialStkSize, 
+		       rts_apply(cap,
+			   rts_apply(cap,
 			       (StgClosure *)runFinalizerBatch_closure,
-			       rts_mkInt(n)), 
+			       rts_mkInt(cap,n)), 
 			   (StgClosure *)arr)
 	);
-    scheduleThread(t);
+    scheduleThread(cap,t);
 }