Adds asio library and Storage Module

lib/asio-1.18.0/include/asio/detail/gcc_x86_fenced_block.hpp

@@ -0,0 +1,99 @@
+//
+// detail/gcc_x86_fenced_block.hpp
+// ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+//
+// Copyright (c) 2003-2020 Christopher M. Kohlhoff (chris at kohlhoff dot com)
+//
+// Distributed under the Boost Software License, Version 1.0. (See accompanying
+// file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)
+//
+
+#ifndef ASIO_DETAIL_GCC_X86_FENCED_BLOCK_HPP
+#define ASIO_DETAIL_GCC_X86_FENCED_BLOCK_HPP
+
+#if defined(_MSC_VER) && (_MSC_VER >= 1200)
+# pragma once
+#endif // defined(_MSC_VER) && (_MSC_VER >= 1200)
+
+#include "asio/detail/config.hpp"
+
+#if defined(__GNUC__) && (defined(__i386__) || defined(__x86_64__))
+
+#include "asio/detail/noncopyable.hpp"
+
+#include "asio/detail/push_options.hpp"
+
+namespace asio {
+namespace detail {
+
+class gcc_x86_fenced_block
+  : private noncopyable
+{
+public:
+  enum half_t { half };
+  enum full_t { full };
+
+  // Constructor for a half fenced block.
+  explicit gcc_x86_fenced_block(half_t)
+  {
+  }
+
+  // Constructor for a full fenced block.
+  explicit gcc_x86_fenced_block(full_t)
+  {
+    lbarrier();
+  }
+
+  // Destructor.
+  ~gcc_x86_fenced_block()
+  {
+    sbarrier();
+  }
+
+private:
+  static int barrier()
+  {
+    int r = 0, m = 1;
+    __asm__ __volatile__ (
+        "xchgl %0, %1" :
+        "=r"(r), "=m"(m) :
+        "0"(1), "m"(m) :
+        "memory", "cc");
+    return r;
+  }
+
+  static void lbarrier()
+  {
+#if defined(__SSE2__)
+# if (__GNUC__ >= 4) && !defined(__INTEL_COMPILER) && !defined(__ICL)
+    __builtin_ia32_lfence();
+# else // (__GNUC__ >= 4) && !defined(__INTEL_COMPILER) && !defined(__ICL)
+    __asm__ __volatile__ ("lfence" ::: "memory");
+# endif // (__GNUC__ >= 4) && !defined(__INTEL_COMPILER) && !defined(__ICL)
+#else // defined(__SSE2__)
+    barrier();
+#endif // defined(__SSE2__)
+  }
+
+  static void sbarrier()
+  {
+#if defined(__SSE2__)
+# if (__GNUC__ >= 4) && !defined(__INTEL_COMPILER) && !defined(__ICL)
+    __builtin_ia32_sfence();
+# else // (__GNUC__ >= 4) && !defined(__INTEL_COMPILER) && !defined(__ICL)
+    __asm__ __volatile__ ("sfence" ::: "memory");
+# endif // (__GNUC__ >= 4) && !defined(__INTEL_COMPILER) && !defined(__ICL)
+#else // defined(__SSE2__)
+    barrier();
+#endif // defined(__SSE2__)
+  }
+};
+
+} // namespace detail
+} // namespace asio
+
+#include "asio/detail/pop_options.hpp"
+
+#endif // defined(__GNUC__) && (defined(__i386__) || defined(__x86_64__))
+
+#endif // ASIO_DETAIL_GCC_X86_FENCED_BLOCK_HPP