1 files changed, 48 insertions, 0 deletions

diff --git a/libcxx/test/thread/thread.mutex/thread.mutex.requirements/thread.mutex.class/lock.pass.cpp b/libcxx/test/thread/thread.mutex/thread.mutex.requirements/thread.mutex.class/lock.pass.cpp
new file mode 100644
index 00000000000..d017b68f0be
--- /dev/null
+++ b/libcxx/test/thread/thread.mutex/thread.mutex.requirements/thread.mutex.class/lock.pass.cpp
@@ -0,0 +1,48 @@
+//===----------------------------------------------------------------------===//
+//
+// ΚΚΚΚΚΚΚΚΚΚΚΚΚΚΚΚΚΚΚΚThe LLVM Compiler Infrastructure
+//
+// This file is distributed under the University of Illinois Open Source
+// License. See LICENSE.TXT for details.
+//
+//===----------------------------------------------------------------------===//
+
+// <mutex>
+
+// class mutex;
+
+// void lock();
+
+#include <mutex>
+#include <thread>
+#include <cstdlib>
+#include <cassert>
+
+#include <iostream>
+
+std::mutex m;
+
+typedef std::chrono::system_clock Clock;
+typedef Clock::time_point time_point;
+typedef Clock::duration duration;
+typedef std::chrono::milliseconds ms;
+typedef std::chrono::nanoseconds ns;
+
+void f()
+{
+    time_point t0 = Clock::now();
+    m.lock();
+    time_point t1 = Clock::now();
+    m.unlock();
+    ns d = t1 - t0 - ms(250);
+    assert(d < ns(2500000));  // within 2.5ms
+}
+
+int main()
+{
+    m.lock();
+    std::thread t(f);
+    std::this_thread::sleep_for(ms(250));
+    m.unlock();
+    t.join();
+}