1 files changed, 30 insertions, 0 deletions
diff --git a/lib/tsan/lit_tests/sleep_sync.cc b/lib/tsan/lit_tests/sleep_sync.cc
new file mode 100644
index 000000000000..c3d47d311749
--- /dev/null
+++ b/lib/tsan/lit_tests/sleep_sync.cc
@@ -0,0 +1,30 @@
+// RUN: %clangxx_tsan -O1 %s -o %t && %t 2>&1 | FileCheck %s
+#include <pthread.h>
+#include <unistd.h>
+
+int X = 0;
+
+void MySleep() {
+  sleep(1);
+}
+
+void *Thread(void *p) {
+  MySleep();  // Assume the main thread has done the write.
+  X = 42;
+  return 0;
+}
+
+int main() {
+  pthread_t t;
+  pthread_create(&t, 0, Thread, 0);
+  X = 43;
+  pthread_join(t, 0);
+  return 0;
+}
+
+// CHECK: WARNING: ThreadSanitizer: data race
+// ...
+// CHECK:   As if synchronized via sleep:
+// CHECK-NEXT:     #0 sleep
+// CHECK-NEXT:     #1 MySleep
+// CHECK-NEXT:     #2 Thread