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/*
timefn.c - portable time measurement functions
Copyright (C) Yann Collet 2023
GPL v2 License
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; either version 2 of the License, or
(at your option) any later version.
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, write to the Free Software Foundation, Inc.,
51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
You can contact the author at :
- LZ4 source repository : https://github.com/lz4/lz4
- LZ4 public forum : https://groups.google.com/forum/#!forum/lz4c
*/
/* === Dependencies === */
#include "timefn.h"
#include <time.h> /* CLOCK_MONOTONIC, TIME_UTC */
/*-****************************************
* Time functions
******************************************/
#if defined(_WIN32) /* Windows */
# include <stdio.h> /* perror */
# include <stdlib.h> /* abort */
# include <windows.h> /* LARGE_INTEGER */
TIME_t TIME_getTime(void)
{
static LARGE_INTEGER ticksPerSecond;
static int init = 0;
if (!init) {
if (!QueryPerformanceFrequency(&ticksPerSecond)) {
perror("timefn::QueryPerformanceFrequency");
abort();
}
init = 1;
}
{
TIME_t r;
LARGE_INTEGER x;
QueryPerformanceCounter(&x);
r.t = (Duration_ns)(x.QuadPart * 1000000000ULL / ticksPerSecond.QuadPart);
return r;
}
}
#elif defined(__APPLE__) && defined(__MACH__)
# include <mach/mach_time.h> /* mach_timebase_info_data_t, mach_timebase_info, mach_absolute_time */
TIME_t TIME_getTime(void)
{
static mach_timebase_info_data_t rate;
static int init = 0;
if (!init) {
mach_timebase_info(&rate);
init = 1;
}
{
TIME_t r;
r.t = mach_absolute_time() * (Duration_ns)rate.numer
/ (Duration_ns)rate.denom;
return r;
}
}
/* POSIX.1-2001 (optional) */
#elif defined(CLOCK_MONOTONIC)
#include <stdlib.h> /* abort */
#include <stdio.h> /* perror */
TIME_t TIME_getTime(void)
{
/* time must be initialized, othersize it may fail msan test.
* No good reason, likely a limitation of timespec_get() for some target */
struct timespec time = { 0, 0 };
if (clock_gettime(CLOCK_MONOTONIC, &time) != 0) {
perror("timefn::clock_gettime(CLOCK_MONOTONIC)");
abort();
}
{ TIME_t r;
r.t = (Duration_ns)time.tv_sec * 1000000000ULL
+ (Duration_ns)time.tv_nsec;
return r;
}
}
/* C11 requires support of timespec_get().
* However, FreeBSD 11 claims C11 compliance while lacking timespec_get().
* Double confirm timespec_get() support by checking the definition of TIME_UTC.
* However, some versions of Android manage to simultaneously define TIME_UTC
* and lack timespec_get() support... */
#elif (defined(__STDC_VERSION__) && (__STDC_VERSION__ >= 201112L) /* C11 */) \
&& defined(TIME_UTC) && !defined(__ANDROID__)
# include <stdio.h> /* perror */
# include <stdlib.h> /* abort */
TIME_t TIME_getTime(void)
{
/* time must be initialized, othersize it may fail msan test */
struct timespec time = { 0, 0 };
if (timespec_get(&time, TIME_UTC) != TIME_UTC) {
perror("timefn::timespec_get(TIME_UTC)");
abort();
}
{
TIME_t r;
r.t = (Duration_ns)time.tv_sec * 1000000000ULL
+ (Duration_ns)time.tv_nsec;
return r;
}
}
#else /* relies on standard C90 (note : clock_t produces wrong measurements \
for multi-threaded workloads) */
TIME_t TIME_getTime(void)
{
TIME_t r;
r.t = (Duration_ns)clock() * 1000000000ULL / CLOCKS_PER_SEC;
return r;
}
# define TIME_MT_MEASUREMENTS_NOT_SUPPORTED
#endif
/* ==== Common functions, valid for all time API ==== */
Duration_ns TIME_span_ns(TIME_t clockStart, TIME_t clockEnd)
{
return clockEnd.t - clockStart.t;
}
Duration_ns TIME_clockSpan_ns(TIME_t clockStart)
{
TIME_t const clockEnd = TIME_getTime();
return TIME_span_ns(clockStart, clockEnd);
}
void TIME_waitForNextTick(void)
{
TIME_t const clockStart = TIME_getTime();
TIME_t clockEnd;
do {
clockEnd = TIME_getTime();
} while (TIME_span_ns(clockStart, clockEnd) == 0);
}
int TIME_support_MT_measurements(void)
{
#if defined(TIME_MT_MEASUREMENTS_NOT_SUPPORTED)
return 0;
#else
return 1;
#endif
}
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