Imported Upstream version 6.10.0.49

Former-commit-id: 1d6753294b2993e1fbf92de9366bb9544db4189b

external/llvm-project/compiler-rt/test/tsan/benign_race.cc

@@ -0,0 +1,39 @@
+// RUN: %clang_tsan -O1 %s -o %t && %run %t 2>&1 | FileCheck %s
+#include "test.h"
+
+int Global;
+int WTFGlobal;
+
+extern "C" {
+void AnnotateBenignRaceSized(const char *f, int l,
+                             void *mem, unsigned int size, const char *desc);
+void WTFAnnotateBenignRaceSized(const char *f, int l,
+                                void *mem, unsigned int size,
+                                const char *desc);
+}
+
+
+void *Thread(void *x) {
+  Global = 42;
+  WTFGlobal = 142;
+  barrier_wait(&barrier);
+  return 0;
+}
+
+int main() {
+  barrier_init(&barrier, 2);
+  AnnotateBenignRaceSized(__FILE__, __LINE__,
+                          &Global, sizeof(Global), "Race on Global");
+  WTFAnnotateBenignRaceSized(__FILE__, __LINE__,
+                             &WTFGlobal, sizeof(WTFGlobal),
+                             "Race on WTFGlobal");
+  pthread_t t;
+  pthread_create(&t, 0, Thread, 0);
+  barrier_wait(&barrier);
+  Global = 43;
+  WTFGlobal = 143;
+  pthread_join(t, 0);
+  fprintf(stderr, "OK\n");
+}
+
+// CHECK-NOT: WARNING: ThreadSanitizer: data race