From: Ivan Maidanski <ivmai@mail.ru>
Date: Tue, 21 Nov 2017 08:45:30 +0000 (+0300)
Subject: Eliminate TSan warning about data race in make_descriptor
X-Git-Tag: v8.0.0~502
X-Git-Url: https://granicus.if.org/sourcecode?a=commitdiff_plain;h=a3ee14468b807ecf2d6fa279699b7a9879443bdf;p=gc

Eliminate TSan warning about data race in make_descriptor

* typd_mlc.c [THREADS) && AO_HAVE_load_acquire && AO_HAVE_store]
(GC_make_descriptor): Use AO_store for setting
GC_explicit_typing_initialized (to true).
---

diff --git a/typd_mlc.c b/typd_mlc.c
index f62bc5d3..da2ca274 100644
--- a/typd_mlc.c
+++ b/typd_mlc.c
@@ -542,7 +542,12 @@ GC_API GC_descr GC_CALL GC_make_descriptor(const GC_word * bm, size_t len)
 #     endif
       {
         GC_init_explicit_typing();
-        GC_explicit_typing_initialized = TRUE;
+#       if defined(THREADS) && defined(AO_HAVE_load_acquire) \
+           && defined(AO_HAVE_store)
+          AO_store(&GC_explicit_typing_initialized, (AO_t)TRUE);
+#       else
+          GC_explicit_typing_initialized = TRUE;
+#       endif
       }
       UNLOCK();
     }