--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/src/hotspot/os/windows/iphlp_interface.cpp	Thu Jun 28 15:06:55 2018 +0200
@@ -0,0 +1,105 @@
+/*
+ * Copyright (c) 2018, Oracle and/or its affiliates. All rights reserved.
+ * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
+ *
+ * This code is free software; you can redistribute it and/or modify it
+ * under the terms of the GNU General Public License version 2 only, as
+ * published by the Free Software Foundation.
+ *
+ * This code is distributed in the hope that it will be useful, but WITHOUT
+ * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
+ * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
+ * version 2 for more details (a copy is included in the LICENSE file that
+ * accompanied this code).
+ *
+ * You should have received a copy of the GNU General Public License version
+ * 2 along with this work; if not, write to the Free Software Foundation,
+ * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
+ *
+ * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
+ * or visit www.oracle.com if you need additional information or have any
+ * questions.
+ *
+ */
+
+#include "precompiled.hpp"
+#include "iphlp_interface.hpp"
+#include "runtime/os.hpp"
+
+// IPHLP API
+typedef DWORD(WINAPI *GetIfTable2_Fn)(PMIB_IF_TABLE2*);
+typedef DWORD(WINAPI *FreeMibTable_Fn)(PVOID);
+
+// IPHLP statics
+GetIfTable2_Fn IphlpDll::_GetIfTable2 = NULL;
+FreeMibTable_Fn IphlpDll::_FreeMibTable = NULL;
+
+LONG IphlpDll::_critical_section = 0;
+LONG IphlpDll::_initialized = 0;
+LONG IphlpDll::_iphlp_reference_count = 0;
+HMODULE IphlpDll::_hModule = NULL;
+
+void IphlpDll::initialize(void) {
+  _hModule = os::win32::load_Windows_dll("iphlpapi.dll", NULL, 0);
+
+  if (NULL == _hModule) {
+    return;
+  }
+
+  // The 'A' at the end means the ANSI (not the UNICODE) vesions of the methods
+  _GetIfTable2 = (GetIfTable2_Fn)::GetProcAddress(_hModule, "GetIfTable2");
+  _FreeMibTable = (FreeMibTable_Fn)::GetProcAddress(_hModule, "FreeMibTable");
+
+  // interlock is used for fencing
+  InterlockedExchange(&_initialized, 1);
+}
+
+bool IphlpDll::IphlpDetach(void) {
+  LONG prev_ref_count = InterlockedExchangeAdd(&_iphlp_reference_count, -1);
+  BOOL ret = false;
+
+  if (1 == prev_ref_count) {
+    if (_initialized && _hModule != NULL) {
+      ret = FreeLibrary(_hModule);
+      if (ret) {
+        _hModule = NULL;
+        _GetIfTable2 = NULL;
+        _FreeMibTable = NULL;
+        InterlockedExchange(&_initialized, 0);
+      }
+    }
+  }
+  return ret != 0;
+}
+
+bool IphlpDll::IphlpAttach(void) {
+  InterlockedExchangeAdd(&_iphlp_reference_count, 1);
+
+  if (1 == _initialized) {
+    return true;
+  }
+
+  while (InterlockedCompareExchange(&_critical_section, 1, 0) == 1);
+
+  if (0 == _initialized) {
+    initialize();
+  }
+
+  while (InterlockedCompareExchange(&_critical_section, 0, 1) == 0);
+
+  return (_GetIfTable2 != NULL && _FreeMibTable != NULL);
+}
+
+DWORD IphlpDll::GetIfTable2(PMIB_IF_TABLE2* Table) {
+  assert(_initialized && _GetIfTable2 != NULL,
+         "IphlpAttach() not yet called");
+
+  return _GetIfTable2(Table);
+}
+
+DWORD IphlpDll::FreeMibTable(PVOID Memory) {
+  assert(_initialized && _FreeMibTable != NULL,
+         "IphlpAttach() not yet called");
+
+  return _FreeMibTable(Memory);
+}