Use monotonic clock in synthetic SleepFor test helper

llvm-svn: 273089

1 files changed, 2 insertions, 2 deletions

diff --git a/libcxx/test/support/filesystem_test_helper.hpp b/libcxx/test/support/filesystem_test_helper.hpp
index 8dcf53aee75..fdab4d6153f 100644
--- a/libcxx/test/support/filesystem_test_helper.hpp
+++ b/libcxx/test/support/filesystem_test_helper.hpp
@@ -388,9 +388,9 @@ inline std::error_code GetTestEC() {
 // available in single-threaded mode.
 void SleepFor(std::chrono::seconds dur) {
     using namespace std::chrono;
-    const auto curr_time = system_clock::now();
+    const auto curr_time = steady_clock::now();
     auto wake_time = curr_time + dur;
-    while (system_clock::now() < wake_time)
+    while (steady_clock::now() < wake_time)
         ;
 }