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-rw-r--r--includes/rts/storage/TSO.h3
1 files changed, 3 insertions, 0 deletions
diff --git a/includes/rts/storage/TSO.h b/includes/rts/storage/TSO.h
index 070ecbebaa..d706282796 100644
--- a/includes/rts/storage/TSO.h
+++ b/includes/rts/storage/TSO.h
@@ -231,6 +231,9 @@ typedef struct StgTSO_ {
* setting the stack's mark bit (either the BF_MARKED bit for large objects
* or otherwise its bit in its segment's mark bitmap).
*
+ * To ensure that mutation does not proceed until the stack is fully marked the
+ * mark phase must not set the mark bit until it has finished tracing.
+ *
*/
#define STACK_DIRTY 1