Move test into test/std subdirectory.

git-svn-id: https://llvm.org/svn/llvm-project/libcxx/trunk@224658 91177308-0d34-0410-b5e6-96231b3b80d8

test/std/thread/thread.threads/thread.thread.this/sleep_for.pass.cpp

@@ -0,0 +1,54 @@
+//===----------------------------------------------------------------------===//
+//
+//                     The LLVM Compiler Infrastructure
+//
+// This file is dual licensed under the MIT and the University of Illinois Open
+// Source Licenses. See LICENSE.TXT for details.
+//
+//===----------------------------------------------------------------------===//
+//
+// UNSUPPORTED: libcpp-has-no-threads
+
+// <thread>
+
+// template <class Rep, class Period>
+//   void sleep_for(const chrono::duration<Rep, Period>& rel_time);
+
+#include <thread>
+#include <cstdlib>
+#include <cassert>
+#include <signal.h>
+#include <sys/time.h>
+
+int main()
+{
+    int ec;
+    struct sigaction action;
+    action.sa_handler = [](int) {};
+    sigemptyset(&action.sa_mask);
+    action.sa_flags = 0;
+
+    ec = sigaction(SIGALRM, &action, nullptr);
+    assert(!ec);
+
+    struct itimerval it;
+    it.it_interval = { 0 };
+    it.it_value.tv_sec = 0;
+    it.it_value.tv_usec = 250000;
+    // This will result in a SIGALRM getting fired resulting in the nanosleep
+    // inside sleep_for getting EINTR.
+    ec = setitimer(ITIMER_REAL, &it, nullptr);
+    assert(!ec);
+
+    typedef std::chrono::system_clock Clock;
+    typedef Clock::time_point time_point;
+    typedef Clock::duration duration;
+    std::chrono::milliseconds ms(500);
+    time_point t0 = Clock::now();
+    std::this_thread::sleep_for(ms);
+    time_point t1 = Clock::now();
+    std::chrono::nanoseconds ns = (t1 - t0) - ms;
+    std::chrono::nanoseconds err = 5 * ms / 100;
+    // The time slept is within 5% of 500ms
+    assert(std::abs(ns.count()) < err.count());
+}