X-Git-Url: http://git.megacz.com/?a=blobdiff_plain;f=rts%2FSchedule.c;h=3f428141dff7f48641386855c0a25388c79b86d2;hb=a200038f469418fef77d863dc3d1cd0125ec1e82;hp=7f59f09155bd02e18c5dbe3ba6d5d7d468dbf53a;hpb=848dafe81b0b7e3564c09109a2f30b598235c555;p=ghc-hetmet.git

diff --git a/rts/Schedule.c b/rts/Schedule.c
index 7f59f09..3f42814 100644
--- a/rts/Schedule.c
+++ b/rts/Schedule.c
@@ -1912,7 +1912,7 @@ scheduleWaitThread (StgTSO* tso, /*[out]*/HaskellObj* ret, Capability *cap)
  * ------------------------------------------------------------------------- */
 
 #if defined(THREADED_RTS)
-void
+void OSThreadProcAttr
 workerStart(Task *task)
 {
     Capability *cap;
@@ -2192,7 +2192,7 @@ static StgTSO *
 threadStackUnderflow (Task *task STG_UNUSED, StgTSO *tso)
 {
     bdescr *bd, *new_bd;
-    lnat new_tso_size_w, tso_size_w;
+    lnat free_w, tso_size_w;
     StgTSO *new_tso;
 
     tso_size_w = tso_sizeW(tso);
@@ -2207,19 +2207,19 @@ threadStackUnderflow (Task *task STG_UNUSED, StgTSO *tso)
     // while we are moving the TSO:
     lockClosure((StgClosure *)tso);
 
-    new_tso_size_w = round_to_mblocks(tso_size_w/2);
-
-    debugTrace(DEBUG_sched, "thread %ld: reducing TSO size from %lu words to %lu",
-               (long)tso->id, tso_size_w, new_tso_size_w);
+    // this is the number of words we'll free
+    free_w = round_to_mblocks(tso_size_w/2);
 
     bd = Bdescr((StgPtr)tso);
-    new_bd = splitLargeBlock(bd, new_tso_size_w / BLOCK_SIZE_W);
-    new_bd->free = bd->free;
+    new_bd = splitLargeBlock(bd, free_w / BLOCK_SIZE_W);
     bd->free = bd->start + TSO_STRUCT_SIZEW;
 
     new_tso = (StgTSO *)new_bd->start;
     memcpy(new_tso,tso,TSO_STRUCT_SIZE);
-    new_tso->stack_size = new_tso_size_w - TSO_STRUCT_SIZEW;
+    new_tso->stack_size = new_bd->free - new_tso->stack;
+
+    debugTrace(DEBUG_sched, "thread %ld: reducing TSO size from %lu words to %lu",
+               (long)tso->id, tso_size_w, tso_sizeW(new_tso));
 
     tso->what_next = ThreadRelocated;
     tso->_link = new_tso; // no write barrier reqd: same generation