[common/c-host] move agnostic code into common library

common/include/common/time.h

@@ -0,0 +1,45 @@
+/*
+Looking Glass - KVM FrameRelay (KVMFR) Client
+Copyright (C) 2017-2020 Geoffrey McRae <geoff@hostfission.com>
+https://looking-glass.hostfission.com
+
+This program is free software; you can redistribute it and/or modify it under
+the terms of the GNU General Public License as published by the Free Software
+Foundation; either version 2 of the License, or (at your option) any later
+version.
+
+This program 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 for more details.
+
+You should have received a copy of the GNU General Public License along with
+this program; if not, write to the Free Software Foundation, Inc., 59 Temple
+Place, Suite 330, Boston, MA 02111-1307 USA
+*/
+
+#pragma once
+
+#include <stdint.h>
+
+#if defined(_WIN32)
+#include <windows.h>
+#else
+#include <time.h>
+#endif
+
+static inline uint64_t getMicrotime()
+{
+#if defined(_WIN32)
+  static LARGE_INTEGER freq = { 0 };
+  if (!freq.QuadPart)
+    QueryPerformanceFrequency(&freq);
+
+  LARGE_INTEGER time;
+  QueryPerformanceCounter(&time);
+  return time.QuadPart / (freq.QuadPart / 1000000LL);
+#else
+  struct timespec time;
+  clock_gettime(CLOCK_MONOTONIC, &time);
+  return (uint64_t)time.tv_sec * 1000000LL + time.tv_nsec / 1000LL;
+#endif
+}