time-linux.cpp revision 6cf438776892898b86c5c34c92e32fc446b057d2
/* $Id$ */
/** @file
* IPRT - Time, POSIX.
*/
/*
* Copyright (C) 2006-2014 Oracle Corporation
*
* This file is part of VirtualBox Open Source Edition (OSE), as
* available from http://www.virtualbox.org. This file is free software;
* General Public License (GPL) as published by the Free Software
* Foundation, in version 2 as it comes in the "COPYING" file of the
* VirtualBox OSE distribution. VirtualBox OSE is distributed in the
* hope that it will be useful, but WITHOUT ANY WARRANTY of any kind.
*
* The contents of this file may alternatively be used under the terms
* of the Common Development and Distribution License Version 1.0
* (CDDL) only, as it comes in the "COPYING.CDDL" file of the
* VirtualBox OSE distribution, in which case the provisions of the
* CDDL are applicable instead of those of the GPL.
*
* You may elect to license modified versions of this file under the
* terms and conditions of either the GPL or the CDDL or both.
*/
/*******************************************************************************
* Header Files *
*******************************************************************************/
#define LOG_GROUP RTLOGGROUP_TIME
#define RTTIME_INCL_TIMEVAL
#include <time.h>
#include <unistd.h>
#ifndef __NR_clock_gettime
# define __NR_timer_create 259
#endif
{
if (rc >= 0)
return rc;
return -1;
}
/**
* Wrapper around various monotone time sources.
*/
{
static int iWorking = -1;
switch (iWorking)
{
#ifdef CLOCK_MONOTONIC
/*
* Standard clock_gettime()
*/
case 0:
/*
* Syscall clock_gettime().
*/
case 1:
#endif /* CLOCK_MONOTONIC */
/*
* Figure out what's working.
*/
case -1:
{
int rc;
#ifdef CLOCK_MONOTONIC
/*
* Real-Time API.
*/
if (!rc)
{
iWorking = 0;
return 0;
}
if (!rc)
{
iWorking = 1;
return 0;
}
#endif /* CLOCK_MONOTONIC */
/* give up */
iWorking = -2;
break;
}
}
return -1;
}
{
/* check monotonic clock first. */
static bool fMonoClock = true;
if (fMonoClock)
{
if (!mono_clock(&ts))
fMonoClock = false;
}
/* fallback to gettimeofday(). */
}
/**
* Gets the current nanosecond timestamp.
*
* This differs from RTTimeNanoTS in that it will use system APIs and not do any
* resolution or performance optimizations.
*
* @returns nanosecond timestamp.
*/
{
return rtTimeGetSystemNanoTS();
}
/**
* Gets the current millisecond timestamp.
*
* This differs from RTTimeNanoTS in that it will use system APIs and not do any
* resolution or performance optimizations.
*
* @returns millisecond timestamp.
*/
{
return rtTimeGetSystemNanoTS() / RT_NS_1MS;
}