1 files changed, 43 insertions, 0 deletions
diff --git a/test/tsan/Darwin/workerthreads.mm b/test/tsan/Darwin/workerthreads.mm
new file mode 100644
index 000000000000..18369fd62dd3
--- /dev/null
+++ b/test/tsan/Darwin/workerthreads.mm
@@ -0,0 +1,43 @@
+// RUN: %clang_tsan %s -o %t -framework Foundation
+// RUN: %deflake %run %t 2>&1 | FileCheck %s
+
+#import <Foundation/Foundation.h>
+
+#import "../test.h"
+
+long global;
+
+int main() {
+  fprintf(stderr, "Hello world.\n");
+  print_address("addr=", 1, &global);
+  barrier_init(&barrier, 2);
+
+  global = 42;
+  dispatch_async(dispatch_get_global_queue(DISPATCH_QUEUE_PRIORITY_DEFAULT, 0), ^{
+    global = 43;
+    barrier_wait(&barrier);
+  });
+
+  dispatch_async(dispatch_get_global_queue(DISPATCH_QUEUE_PRIORITY_DEFAULT, 0), ^{
+    barrier_wait(&barrier);
+    global = 44;
+
+    dispatch_sync(dispatch_get_main_queue(), ^{
+      CFRunLoopStop(CFRunLoopGetCurrent());
+    });
+  });
+
+  CFRunLoopRun();
+  fprintf(stderr, "Done.\n");
+}
+
+// CHECK: Hello world.
+// CHECK: WARNING: ThreadSanitizer: data race
+// CHECK: Write of size 8
+// CHECK: Previous write of size 8
+// CHECK: Location is global
+// CHECK: Thread {{.*}} is a GCD worker thread
+// CHECK-NOT: failed to restore the stack
+// CHECK: Thread {{.*}} is a GCD worker thread
+// CHECK-NOT: failed to restore the stack
+// CHECK: Done.