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/*
* Copyright (c) Meta Platforms, Inc. and affiliates.
* All rights reserved.
*
* This source code is licensed under both the BSD-style license (found in the
* LICENSE file in the root directory of this source tree) and the GPLv2 (found
* in the COPYING file in the root directory of this source tree).
* You may select, at your option, one of the above-listed licenses.
*/
/* === Dependencies === */
#include "timefn.h"
#include "platform.h" /* set _POSIX_C_SOURCE */
#include <time.h> /* CLOCK_MONOTONIC, TIME_UTC */
/*-****************************************
* Time functions
******************************************/
#if defined(_WIN32) /* Windows */
#include <windows.h> /* LARGE_INTEGER */
#include <stdlib.h> /* abort */
#include <stdio.h> /* perror */
UTIL_time_t UTIL_getTime(void)
{
static LARGE_INTEGER ticksPerSecond;
static int init = 0;
if (!init) {
if (!QueryPerformanceFrequency(&ticksPerSecond)) {
perror("timefn::QueryPerformanceFrequency");
abort();
}
init = 1;
}
{ UTIL_time_t r;
LARGE_INTEGER x;
QueryPerformanceCounter(&x);
r.t = (PTime)(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 */
UTIL_time_t UTIL_getTime(void)
{
static mach_timebase_info_data_t rate;
static int init = 0;
if (!init) {
mach_timebase_info(&rate);
init = 1;
}
{ UTIL_time_t r;
r.t = mach_absolute_time() * (PTime)rate.numer / (PTime)rate.denom;
return r;
}
}
/* POSIX.1-2001 (optional) */
#elif defined(CLOCK_MONOTONIC)
#include <stdlib.h> /* abort */
#include <stdio.h> /* perror */
UTIL_time_t UTIL_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();
}
{ UTIL_time_t r;
r.t = (PTime)time.tv_sec * 1000000000ULL + (PTime)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 simultanously define TIME_UTC
* and lack timespec_get() support... */
#elif (defined (__STDC_VERSION__) && (__STDC_VERSION__ >= 201112L) /* C11 */) \
&& defined(TIME_UTC) && !defined(__ANDROID__)
#include <stdlib.h> /* abort */
#include <stdio.h> /* perror */
UTIL_time_t UTIL_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 (timespec_get(&time, TIME_UTC) != TIME_UTC) {
perror("timefn::timespec_get(TIME_UTC)");
abort();
}
{ UTIL_time_t r;
r.t = (PTime)time.tv_sec * 1000000000ULL + (PTime)time.tv_nsec;
return r;
}
}
#else /* relies on standard C90 (note : clock_t produces wrong measurements for multi-threaded workloads) */
UTIL_time_t UTIL_getTime(void)
{
UTIL_time_t r;
r.t = (PTime)clock() * 1000000000ULL / CLOCKS_PER_SEC;
return r;
}
#define TIME_MT_MEASUREMENTS_NOT_SUPPORTED
#endif
/* ==== Common functions, valid for all time API ==== */
PTime UTIL_getSpanTimeNano(UTIL_time_t clockStart, UTIL_time_t clockEnd)
{
return clockEnd.t - clockStart.t;
}
PTime UTIL_getSpanTimeMicro(UTIL_time_t begin, UTIL_time_t end)
{
return UTIL_getSpanTimeNano(begin, end) / 1000ULL;
}
PTime UTIL_clockSpanMicro(UTIL_time_t clockStart )
{
UTIL_time_t const clockEnd = UTIL_getTime();
return UTIL_getSpanTimeMicro(clockStart, clockEnd);
}
PTime UTIL_clockSpanNano(UTIL_time_t clockStart )
{
UTIL_time_t const clockEnd = UTIL_getTime();
return UTIL_getSpanTimeNano(clockStart, clockEnd);
}
void UTIL_waitForNextTick(void)
{
UTIL_time_t const clockStart = UTIL_getTime();
UTIL_time_t clockEnd;
do {
clockEnd = UTIL_getTime();
} while (UTIL_getSpanTimeNano(clockStart, clockEnd) == 0);
}
int UTIL_support_MT_measurements(void)
{
# if defined(TIME_MT_MEASUREMENTS_NOT_SUPPORTED)
return 0;
# else
return 1;
# endif
}
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