1 files changed, 38 insertions, 0 deletions
diff --git a/test/tsan/libdispatch/source-serial.c b/test/tsan/libdispatch/source-serial.c
new file mode 100644
index 000000000..3f22c4404
--- /dev/null
+++ b/test/tsan/libdispatch/source-serial.c
@@ -0,0 +1,38 @@
+// RUN: %clang_tsan %s -o %t
+// RUN: %run %t 2>&1 | FileCheck %s --implicit-check-not='ThreadSanitizer'
+
+#include <dispatch/dispatch.h>
+
+#include <stdio.h>
+
+long global;
+
+int main(int argc, const char *argv[]) {
+  fprintf(stderr, "Hello world.\n");
+
+  dispatch_queue_t q = dispatch_queue_create("my.queue", DISPATCH_QUEUE_SERIAL);
+  dispatch_source_t timer = dispatch_source_create(DISPATCH_SOURCE_TYPE_TIMER, 0, 0, q);
+  long long interval_ms = 10;
+  dispatch_source_set_timer(timer, dispatch_time(DISPATCH_TIME_NOW, 0), interval_ms * NSEC_PER_MSEC, 0);
+
+  dispatch_semaphore_t sem = dispatch_semaphore_create(0);
+  dispatch_source_set_event_handler(timer, ^{
+    fprintf(stderr, "timer\n");
+    global++;
+
+    if (global > 50) {
+      dispatch_semaphore_signal(sem);
+      dispatch_suspend(timer);
+    }
+  });
+  dispatch_resume(timer);
+
+  dispatch_semaphore_wait(sem, DISPATCH_TIME_FOREVER);
+
+  fprintf(stderr, "Done.\n");
+}
+
+// CHECK: Hello world.
+// CHECK: timer
+// CHECK: Done.
+// CHECK-NOT: timer