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-rw-r--r--test/tsan/Darwin/gcd-semaphore-norace.mm29
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diff --git a/test/tsan/Darwin/gcd-semaphore-norace.mm b/test/tsan/Darwin/gcd-semaphore-norace.mm
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index 000000000000..cd52a79ca65a
--- /dev/null
+++ b/test/tsan/Darwin/gcd-semaphore-norace.mm
@@ -0,0 +1,29 @@
+// RUN: %clang_tsan %s -o %t -framework Foundation
+// RUN: %run %t 2>&1
+
+#import <Foundation/Foundation.h>
+
+long global;
+
+int main() {
+ NSLog(@"Hello world.");
+
+ global = 42;
+
+ dispatch_semaphore_t sem = dispatch_semaphore_create(0);
+ dispatch_async(dispatch_get_global_queue(DISPATCH_QUEUE_PRIORITY_DEFAULT, 0), ^{
+
+ global = 43;
+ dispatch_semaphore_signal(sem);
+ });
+
+ dispatch_semaphore_wait(sem, DISPATCH_TIME_FOREVER);
+ global = 44;
+
+ NSLog(@"Done.");
+ return 0;
+}
+
+// CHECK: Hello world.
+// CHECK: Done.
+// CHECK-NOT: WARNING: ThreadSanitizer