/**************************************************************************
 *
 * Copyright 2008-2010 VMware, Inc.
 * All Rights Reserved.
 *
 * Permission is hereby granted, free of charge, to any person obtaining a
 * copy of this software and associated documentation files (the
 * "Software"), to deal in the Software without restriction, including
 * without limitation the rights to use, copy, modify, merge, publish,
 * distribute, sub license, and/or sell copies of the Software, and to
 * permit persons to whom the Software is furnished to do so, subject to
 * the following conditions:
 *
 * The above copyright notice and this permission notice (including the
 * next paragraph) shall be included in all copies or substantial portions
 * of the Software.
 *
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
 * OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
 * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NON-INFRINGEMENT.
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 * TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE
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/**
 * @file
 * OS independent time-manipulation functions.
 * 
 * @author Jose Fonseca <jfonseca@vmware.com>
 */


#include "pipe/p_config.h"

#if defined(PIPE_OS_UNIX)
#  include <time.h> /* timeval */
#  include <sys/time.h> /* timeval */
#elif defined(PIPE_SUBSYSTEM_WINDOWS_USER)
#  include <windows.h>
#else
#  error Unsupported OS
#endif

#include "os_time.h"


int64_t
os_time_get_nano(void)
{
#if defined(PIPE_OS_LINUX)

   struct timespec tv;
   clock_gettime(CLOCK_MONOTONIC, &tv);
   return tv.tv_nsec + tv.tv_sec*INT64_C(1000000000);

#elif defined(PIPE_OS_UNIX)

   struct timeval tv;
   gettimeofday(&tv, NULL);
   return tv.tv_usec*INT64_C(1000) + tv.tv_sec*INT64_C(1000000000);

#elif defined(PIPE_SUBSYSTEM_WINDOWS_USER)

   static LARGE_INTEGER frequency;
   LARGE_INTEGER counter;
   if(!frequency.QuadPart)
      QueryPerformanceFrequency(&frequency);
   QueryPerformanceCounter(&counter);
   return counter.QuadPart*INT64_C(1000000000)/frequency.QuadPart;

#else

#error Unsupported OS

#endif
}


#if defined(PIPE_SUBSYSTEM_WINDOWS_USER)

void
os_time_sleep(int64_t usecs)
{
   DWORD dwMilliseconds = (usecs + 999) / 1000;
   /* Avoid Sleep(O) as that would cause to sleep for an undetermined duration */
   if (dwMilliseconds) {
      Sleep(dwMilliseconds);
   }
}

#endif