VirtualBox

source: vbox/trunk/src/VBox/Runtime/r3/posix/time-posix.cpp@ 64468

Last change on this file since 64468 was 62477, checked in by vboxsync, 8 years ago

(C) 2016

  • Property svn:eol-style set to native
  • Property svn:keywords set to Id Revision
File size: 2.8 KB
Line 
1/* $Id: time-posix.cpp 62477 2016-07-22 18:27:37Z vboxsync $ */
2/** @file
3 * IPRT - Time, POSIX.
4 */
5
6/*
7 * Copyright (C) 2006-2016 Oracle Corporation
8 *
9 * This file is part of VirtualBox Open Source Edition (OSE), as
10 * available from http://www.virtualbox.org. This file is free software;
11 * you can redistribute it and/or modify it under the terms of the GNU
12 * General Public License (GPL) as published by the Free Software
13 * Foundation, in version 2 as it comes in the "COPYING" file of the
14 * VirtualBox OSE distribution. VirtualBox OSE is distributed in the
15 * hope that it will be useful, but WITHOUT ANY WARRANTY of any kind.
16 *
17 * The contents of this file may alternatively be used under the terms
18 * of the Common Development and Distribution License Version 1.0
19 * (CDDL) only, as it comes in the "COPYING.CDDL" file of the
20 * VirtualBox OSE distribution, in which case the provisions of the
21 * CDDL are applicable instead of those of the GPL.
22 *
23 * You may elect to license modified versions of this file under the
24 * terms and conditions of either the GPL or the CDDL or both.
25 */
26
27
28/*********************************************************************************************************************************
29* Header Files *
30*********************************************************************************************************************************/
31#define LOG_GROUP RTLOGGROUP_TIME
32#define RTTIME_INCL_TIMEVAL
33#include <sys/time.h>
34#include <time.h>
35
36#include <iprt/time.h>
37#include "internal/time.h"
38
39
40DECLINLINE(uint64_t) rtTimeGetSystemNanoTS(void)
41{
42#if defined(CLOCK_MONOTONIC) && !defined(RT_OS_L4) && !defined(RT_OS_OS2)
43 /* check monotonic clock first. */
44 static bool s_fMonoClock = true;
45 if (s_fMonoClock)
46 {
47 struct timespec ts;
48 if (!clock_gettime(CLOCK_MONOTONIC, &ts))
49 return (uint64_t)ts.tv_sec * RT_NS_1SEC_64
50 + ts.tv_nsec;
51 s_fMonoClock = false;
52 }
53#endif
54
55 /* fallback to gettimeofday(). */
56 struct timeval tv;
57 gettimeofday(&tv, NULL);
58 return (uint64_t)tv.tv_sec * RT_NS_1SEC_64
59 + (uint64_t)(tv.tv_usec * RT_NS_1US);
60}
61
62
63/**
64 * Gets the current nanosecond timestamp.
65 *
66 * This differs from RTTimeNanoTS in that it will use system APIs and not do any
67 * resolution or performance optimizations.
68 *
69 * @returns nanosecond timestamp.
70 */
71RTDECL(uint64_t) RTTimeSystemNanoTS(void)
72{
73 return rtTimeGetSystemNanoTS();
74}
75
76
77/**
78 * Gets the current millisecond timestamp.
79 *
80 * This differs from RTTimeNanoTS in that it will use system APIs and not do any
81 * resolution or performance optimizations.
82 *
83 * @returns millisecond timestamp.
84 */
85RTDECL(uint64_t) RTTimeSystemMilliTS(void)
86{
87 return rtTimeGetSystemNanoTS() / RT_NS_1MS;
88}
89
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