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/*
* Copyright 2013 MongoDB, Inc.
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
#ifdef __APPLE__
# include <mach/clock.h>
# include <mach/mach.h>
# include <mach/mach_time.h>
# include <sys/time.h>
#endif
#include "bson-config.h"
#include "bson-compat.h"
#if defined(BSON_HAVE_CLOCK_GETTIME)
# include <time.h>
# include <sys/time.h>
#endif
#include "bson-clock.h"
/*
*--------------------------------------------------------------------------
*
* bson_gettimeofday --
*
* A wrapper around gettimeofday() with fallback support for Windows.
*
* Returns:
* 0 if successful.
*
* Side effects:
* @tv is set.
*
*--------------------------------------------------------------------------
*/
int
bson_gettimeofday (struct timeval *tv) /* OUT */
{
#if defined(_WIN32)
# if defined(_MSC_VER)
# define DELTA_EPOCH_IN_MICROSEC 11644473600000000Ui64
# else
# define DELTA_EPOCH_IN_MICROSEC 11644473600000000ULL
# endif
FILETIME ft;
uint64_t tmp = 0;
/*
* The const value is shamelessy stolen from
* http://www.boost.org/doc/libs/1_55_0/boost/chrono/detail/inlined/win/chrono.hpp
*
* File times are the number of 100 nanosecond intervals elapsed since
* 12:00 am Jan 1, 1601 UTC. I haven't check the math particularly hard
*
* ... good luck
*/
if (tv) {
GetSystemTimeAsFileTime (&ft);
/* pull out of the filetime into a 64 bit uint */
tmp |= ft.dwHighDateTime;
tmp <<= 32;
tmp |= ft.dwLowDateTime;
/* convert from 100's of nanosecs to microsecs */
tmp /= 10;
/* adjust to unix epoch */
tmp -= DELTA_EPOCH_IN_MICROSEC;
tv->tv_sec = (long)(tmp / 1000000UL);
tv->tv_usec = (long)(tmp % 1000000UL);
}
return 0;
#else
return gettimeofday (tv, NULL);
#endif
}
/*
*--------------------------------------------------------------------------
*
* bson_get_monotonic_time --
*
* Returns the monotonic system time, if available. A best effort is
* made to use the monotonic clock. However, some systems may not
* support such a feature.
*
* Returns:
* The monotonic clock in microseconds.
*
* Side effects:
* None.
*
*--------------------------------------------------------------------------
*/
int64_t
bson_get_monotonic_time (void)
{
#if defined(BSON_HAVE_CLOCK_GETTIME) && defined(CLOCK_MONOTONIC)
struct timespec ts;
clock_gettime (CLOCK_MONOTONIC, &ts);
return ((ts.tv_sec * 1000000UL) + (ts.tv_nsec / 1000UL));
#elif defined(__APPLE__)
static mach_timebase_info_data_t info = { 0 };
static double ratio = 0.0;
if (!info.denom) {
// the value from mach_absolute_time () * info.numer / info.denom
// is in nano seconds. So we have to divid by 1000.0 to get micro seconds
mach_timebase_info (&info);
ratio = (double)info.numer / (double)info.denom / 1000.0;
}
return mach_absolute_time () * ratio;
#elif defined(_WIN32)
/* Despite it's name, this is in milliseconds! */
int64_t ticks = GetTickCount64 ();
return (ticks * 1000L);
#else
# warning "Monotonic clock is not yet supported on your platform."
struct timeval tv;
bson_gettimeofday (&tv);
return (tv.tv_sec * 1000000UL) + tv.tv_usec;
#endif
}
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