1 files changed, 38 insertions, 0 deletions
diff --git a/test/tsan/ignore_malloc.cc b/test/tsan/ignore_malloc.cc
new file mode 100644
index 000000000000..0f1fb5e3dfdc
--- /dev/null
+++ b/test/tsan/ignore_malloc.cc
@@ -0,0 +1,38 @@
+// RUN: %clang_tsan -O1 %s -o %t && %run %t 2>&1 | FileCheck %s
+#include <pthread.h>
+#include <stdlib.h>
+#include <stdio.h>
+#include <unistd.h>
+
+extern "C" {
+void AnnotateIgnoreReadsBegin(const char *f, int l);
+void AnnotateIgnoreReadsEnd(const char *f, int l);
+void AnnotateIgnoreWritesBegin(const char *f, int l);
+void AnnotateIgnoreWritesEnd(const char *f, int l);
+}
+
+int *g;
+
+void *Thread(void *a) {
+  int *p = 0;
+  while ((p = __atomic_load_n(&g, __ATOMIC_RELAXED)) == 0)
+    usleep(100);
+  *p = 42;
+  return 0;
+}
+
+int main() {
+  pthread_t t;
+  pthread_create(&t, 0, Thread, 0);
+  AnnotateIgnoreWritesBegin(__FILE__, __LINE__);
+  int *p = new int(0);
+  AnnotateIgnoreWritesEnd(__FILE__, __LINE__);
+  __atomic_store_n(&g, p, __ATOMIC_RELAXED);
+  pthread_join(t, 0);
+  delete p;
+  fprintf(stderr, "OK\n");
+  return 0;
+}
+
+// CHECK-NOT: WARNING: ThreadSanitizer: data race
+// CHECK: OK