diff options
Diffstat (limited to 'src/VBox/Runtime/r3/linux/time-linux.cpp')
| -rw-r--r-- | src/VBox/Runtime/r3/linux/time-linux.cpp | 169 |
1 files changed, 169 insertions, 0 deletions
diff --git a/src/VBox/Runtime/r3/linux/time-linux.cpp b/src/VBox/Runtime/r3/linux/time-linux.cpp new file mode 100644 index 00000000..6ceac2de --- /dev/null +++ b/src/VBox/Runtime/r3/linux/time-linux.cpp @@ -0,0 +1,169 @@ +/* $Id: time-linux.cpp $ */ +/** @file + * IPRT - Time, POSIX. + */ + +/* + * Copyright (C) 2006-2023 Oracle and/or its affiliates. + * + * This file is part of VirtualBox base platform packages, as + * available from https://www.virtualbox.org. + * + * 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, in version 3 of the + * License. + * + * 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, see <https://www.gnu.org/licenses>. + * + * The contents of this file may alternatively be used under the terms + * of the Common Development and Distribution License Version 1.0 + * (CDDL), a copy of it is provided in the "COPYING.CDDL" file included + * in the VirtualBox 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. + * + * SPDX-License-Identifier: GPL-3.0-only OR CDDL-1.0 + */ + + +/********************************************************************************************************************************* +* Header Files * +*********************************************************************************************************************************/ +#define LOG_GROUP RTLOGGROUP_TIME +#define RTTIME_INCL_TIMEVAL +#include <sys/time.h> +#include <time.h> +#include <sys/syscall.h> +#include <unistd.h> +#ifndef __NR_clock_gettime +# define __NR_timer_create 259 +# define __NR_clock_gettime (__NR_timer_create+6) +#endif + +#include <iprt/time.h> +#include "internal/time.h" + + +DECLINLINE(int) sys_clock_gettime(clockid_t id, struct timespec *ts) +{ + int rc = syscall(__NR_clock_gettime, id, ts); + if (rc >= 0) + return rc; + return -1; +} + + +/** + * Wrapper around various monotone time sources. + */ +DECLINLINE(int) mono_clock(struct timespec *ts) +{ + static int iWorking = -1; + switch (iWorking) + { +#ifdef CLOCK_MONOTONIC + /* + * Standard clock_gettime() + */ + case 0: + return clock_gettime(CLOCK_MONOTONIC, ts); + + /* + * Syscall clock_gettime(). + */ + case 1: + return sys_clock_gettime(CLOCK_MONOTONIC, ts); + +#endif /* CLOCK_MONOTONIC */ + + + /* + * Figure out what's working. + */ + case -1: + { +#ifdef CLOCK_MONOTONIC + /* + * Real-Time API. + */ + int rc = clock_gettime(CLOCK_MONOTONIC, ts); + if (!rc) + { + iWorking = 0; + return 0; + } + + rc = sys_clock_gettime(CLOCK_MONOTONIC, ts); + if (!rc) + { + iWorking = 1; + return 0; + } +#endif /* CLOCK_MONOTONIC */ + + /* give up */ + iWorking = -2; + break; + } + } + return -1; +} + + +DECLINLINE(uint64_t) rtTimeGetSystemNanoTS(void) +{ + /* check monotonic clock first. */ + static bool fMonoClock = true; + if (fMonoClock) + { + struct timespec ts; + if (!mono_clock(&ts)) + return (uint64_t)ts.tv_sec * RT_NS_1SEC_64 + + ts.tv_nsec; + fMonoClock = false; + } + + /* fallback to gettimeofday(). */ + struct timeval tv; + gettimeofday(&tv, NULL); + return (uint64_t)tv.tv_sec * RT_NS_1SEC_64 + + (uint64_t)(tv.tv_usec * RT_NS_1US); +} + + +/** + * 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. + */ +RTDECL(uint64_t) RTTimeSystemNanoTS(void) +{ + 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. + */ +RTDECL(uint64_t) RTTimeSystemMilliTS(void) +{ + return rtTimeGetSystemNanoTS() / RT_NS_1MS; +} + |