1 files changed, 34 insertions, 0 deletions
diff --git a/compiler-rt/test/tsan/fd_dup_norace.cc b/compiler-rt/test/tsan/fd_dup_norace.cc
new file mode 100644
index 00000000000..8826f90fc48
--- /dev/null
+++ b/compiler-rt/test/tsan/fd_dup_norace.cc
@@ -0,0 +1,34 @@
+// RUN: %clangxx_tsan -O1 %s -o %t && %t 2>&1 | FileCheck %s
+#include <pthread.h>
+#include <stdio.h>
+#include <unistd.h>
+#include <sys/types.h>
+#include <sys/stat.h>
+#include <fcntl.h>
+
+int fds[2];
+
+void *Thread1(void *x) {
+  char buf;
+  read(fds[0], &buf, 1);
+  close(fds[0]);
+  return 0;
+}
+
+void *Thread2(void *x) {
+  close(fds[1]);
+  return 0;
+}
+
+int main() {
+  fds[0] = open("/dev/random", O_RDONLY);
+  fds[1] = dup2(fds[0], 100);
+  pthread_t t[2];
+  pthread_create(&t[0], NULL, Thread1, NULL);
+  pthread_create(&t[1], NULL, Thread2, NULL);
+  pthread_join(t[0], NULL);
+  pthread_join(t[1], NULL);
+  printf("OK\n");
+}
+
+// CHECK-NOT: WARNING: ThreadSanitizer: data race