import RT-Thread@9217865c without bsp, libcpu and components/net

components/libc/cplusplus/cpp11/gcc/__utils.h

@@ -0,0 +1,59 @@
+/*
+ * Copyright (c) 2006-2021, RT-Thread Development Team
+ *
+ * SPDX-License-Identifier: Apache-2.0
+ *
+ * Change Logs:
+ * Date           Author       Notes
+ * 2021-04-27     flybreak     the first version.
+ */
+
+#pragma once
+
+#include <cstdlib>
+#include <system_error>
+#include <chrono>
+#include <ratio>
+
+#include <rtthread.h>
+
+#define RT_USING_CPP_EXCEPTION
+
+inline void throw_system_error(int err, const char *what_msg)
+{
+#ifdef RT_USING_CPP_EXCEPTION
+    throw std::system_error(std::error_code(err, std::system_category()), what_msg);
+#else
+    (void)err;
+    (void)what_msg;
+    ::abort();
+#endif
+}
+
+class tick_clock
+{
+public:
+    typedef clock_t rep;
+    typedef std::ratio<1, RT_TICK_PER_SECOND> period;
+
+    typedef std::chrono::duration<tick_clock::rep, tick_clock::period> duration;
+    typedef std::chrono::time_point<tick_clock> time_point;
+
+    constexpr static bool is_ready = true;
+
+    static time_point now();
+};
+
+class real_time_clock
+{
+public:
+    typedef std::chrono::nanoseconds duration;
+    typedef duration::rep rep;
+    typedef duration::period period;
+    typedef std::chrono::time_point<real_time_clock, duration> time_point;
+
+    static constexpr bool is_steady = true;
+
+    static time_point
+    now() noexcept;
+};