Suppress a data race report in debug-related GC_n_set_marks

There could be a race between GC_clear_hdr_marks and GC_n_set_marks
but the latter is for a debug purpose.

* reclaim.c [USE_MARK_BYTES] (GC_n_set_marks): Add
GC_ATTR_NO_SANITIZE_THREAD attribute; update comment.

1 files changed, 3 insertions, 0 deletions

diff --git a/reclaim.c b/reclaim.c
index 5b9498c7..7b0e573c 100644
--- a/reclaim.c
+++ b/reclaim.c
@@ -488,6 +488,9 @@ struct Print_stats
 
 /* Return the number of set mark bits in the given header.      */
 /* Remains externally visible as used by GNU GCJ currently.     */
+/* There could be a race between GC_clear_hdr_marks and this    */
+/* function but the latter is for a debug purpose.              */
+GC_ATTR_NO_SANITIZE_THREAD
 unsigned GC_n_set_marks(hdr *hhdr)
 {
     unsigned result = 0;