X-Git-Url: http://git.megacz.com/?a=blobdiff_plain;f=ghc%2Fincludes%2FTSO.h;h=82ecacb867f065f117560e82e4922769dcecba25;hb=e6218fe7eff4e34e1a3c823cd4b7aebe09d2d4fb;hp=747c070d315d8de361851540d5e92fd3434e7089;hpb=03a9ff01812afc81eb5236fd3063cbec44cf469e;p=ghc-hetmet.git

diff --git a/ghc/includes/TSO.h b/ghc/includes/TSO.h
index 747c070..82ecacb 100644
--- a/ghc/includes/TSO.h
+++ b/ghc/includes/TSO.h
@@ -77,6 +77,22 @@ typedef StgTSOStatBuf StgTSOGranInfo;
  */
 typedef StgWord32 StgThreadID;
 
+/* 
+ * Flags for the tso->flags field.
+ *
+ * The TSO_DIRTY flag indicates that this TSO's stack should be
+ * scanned during garbage collection.  The link field of a TSO is
+ * always scanned, so we don't have to dirty a TSO just for linking
+ * it on a different list.
+ *
+ * TSO_DIRTY is set by 
+ *    - schedule(), just before running a thread,
+ *    - raiseAsync(), because it modifies a thread's stack
+ *    - resumeThread(), just before running the thread again
+ * and unset by the garbage collector (only).
+ */
+#define TSO_DIRTY   1
+
 /*
  * Type returned after running a thread.  Values of this type
  * include HeapOverflow, StackOverflow etc.  See Constants.h for the
@@ -117,18 +133,15 @@ typedef union {
  * field.
  */
 
-/* 
- * ToDo: make this structure sensible on a non-32-bit arch.
- */
-
 typedef struct StgTSO_ {
   StgHeader          header;
 
   struct StgTSO_*    link;	     /* Links threads onto blocking queues */
   struct StgTSO_*    global_link;    /* Links all threads together */
   
-  StgWord16           what_next;  /* Values defined in Constants.h */
-  StgWord16           why_blocked;  /* Values defined in Constants.h */
+  StgWord16          what_next;      /* Values defined in Constants.h */
+  StgWord16          why_blocked;    /* Values defined in Constants.h */
+  StgWord32          flags;
   StgTSOBlockInfo    block_info;
   struct StgTSO_*    blocked_exceptions;
   StgThreadID        id;