mirror of
https://github.com/isar/libmdbx.git
synced 2024-10-30 11:29:19 +08:00
137 lines
4.0 KiB
C++
137 lines
4.0 KiB
C++
/*
|
|
* Copyright 2017-2021 Leonid Yuriev <leo@yuriev.ru>
|
|
* and other libmdbx authors: please see AUTHORS file.
|
|
* All rights reserved.
|
|
*
|
|
* Redistribution and use in source and binary forms, with or without
|
|
* modification, are permitted only as authorized by the OpenLDAP
|
|
* Public License.
|
|
*
|
|
* A copy of this license is available in the file LICENSE in the
|
|
* top-level directory of the distribution or, alternatively, at
|
|
* <http://www.OpenLDAP.org/license.html>.
|
|
*/
|
|
|
|
#include "test.h"
|
|
|
|
namespace chrono {
|
|
|
|
#ifndef NSEC_PER_SEC
|
|
#define NSEC_PER_SEC 1000000000u
|
|
#endif /* NSEC_PER_SEC */
|
|
|
|
uint32_t ns2fractional(uint32_t ns) {
|
|
assert(ns < NSEC_PER_SEC);
|
|
/* LY: здесь и далее используется "длинное деление", которое
|
|
* для ясности кода оставлено как есть (без ручной оптимизации). Так как
|
|
* GCC, Clang и даже MSVC сами давно умеют конвертировать деление на
|
|
* константу в быструю reciprocal-форму. */
|
|
return ((uint64_t)ns << 32) / NSEC_PER_SEC;
|
|
}
|
|
|
|
uint32_t fractional2ns(uint32_t fractional) {
|
|
return (fractional * (uint64_t)NSEC_PER_SEC) >> 32;
|
|
}
|
|
|
|
#ifndef USEC_PER_SEC
|
|
#define USEC_PER_SEC 1000000u
|
|
#endif /* USEC_PER_SEC */
|
|
uint32_t us2fractional(uint32_t us) {
|
|
assert(us < USEC_PER_SEC);
|
|
return ((uint64_t)us << 32) / USEC_PER_SEC;
|
|
}
|
|
|
|
uint32_t fractional2us(uint32_t fractional) {
|
|
return (fractional * (uint64_t)USEC_PER_SEC) >> 32;
|
|
}
|
|
|
|
#ifndef MSEC_PER_SEC
|
|
#define MSEC_PER_SEC 1000u
|
|
#endif /* MSEC_PER_SEC */
|
|
uint32_t ms2fractional(uint32_t ms) {
|
|
assert(ms < MSEC_PER_SEC);
|
|
return ((uint64_t)ms << 32) / MSEC_PER_SEC;
|
|
}
|
|
|
|
uint32_t fractional2ms(uint32_t fractional) {
|
|
return (fractional * (uint64_t)MSEC_PER_SEC) >> 32;
|
|
}
|
|
|
|
time from_ns(uint64_t ns) {
|
|
time result;
|
|
result.fixedpoint = ((ns / NSEC_PER_SEC) << 32) |
|
|
ns2fractional((uint32_t)(ns % NSEC_PER_SEC));
|
|
return result;
|
|
}
|
|
|
|
time from_us(uint64_t us) {
|
|
time result;
|
|
result.fixedpoint = ((us / USEC_PER_SEC) << 32) |
|
|
us2fractional((uint32_t)(us % USEC_PER_SEC));
|
|
return result;
|
|
}
|
|
|
|
time from_ms(uint64_t ms) {
|
|
time result;
|
|
result.fixedpoint = ((ms / MSEC_PER_SEC) << 32) |
|
|
ms2fractional((uint32_t)(ms % MSEC_PER_SEC));
|
|
return result;
|
|
}
|
|
|
|
time now_realtime() {
|
|
#if defined(_WIN32) || defined(_WIN64) || defined(_WINDOWS)
|
|
static void(WINAPI * query_time)(LPFILETIME);
|
|
if (!query_time) {
|
|
query_time = (void(WINAPI *)(LPFILETIME))GetProcAddress(
|
|
GetModuleHandle(TEXT("kernel32.dll")),
|
|
"GetSystemTimePreciseAsFileTime");
|
|
if (!query_time)
|
|
query_time = GetSystemTimeAsFileTime;
|
|
}
|
|
|
|
FILETIME filetime;
|
|
query_time(&filetime);
|
|
uint64_t ns100 =
|
|
(uint64_t)filetime.dwHighDateTime << 32 | filetime.dwLowDateTime;
|
|
return from_ns((ns100 - UINT64_C(116444736000000000)) * 100u);
|
|
#else
|
|
struct timespec ts;
|
|
if (unlikely(clock_gettime(CLOCK_REALTIME, &ts)))
|
|
failure_perror("clock_gettime(CLOCK_REALTIME", errno);
|
|
|
|
return from_timespec(ts);
|
|
#endif
|
|
}
|
|
|
|
time now_monotonic() {
|
|
#if defined(_WIN32) || defined(_WIN64) || defined(_WINDOWS)
|
|
static uint64_t reciprocal;
|
|
static LARGE_INTEGER Frequency;
|
|
if (reciprocal == 0) {
|
|
if (!QueryPerformanceFrequency(&Frequency))
|
|
failure_perror("QueryPerformanceFrequency()", GetLastError());
|
|
reciprocal = (((UINT64_C(1) << 48) + Frequency.QuadPart / 2 + 1) /
|
|
Frequency.QuadPart);
|
|
assert(reciprocal);
|
|
}
|
|
|
|
LARGE_INTEGER Counter;
|
|
if (!QueryPerformanceCounter(&Counter))
|
|
failure_perror("QueryPerformanceCounter()", GetLastError());
|
|
|
|
time result;
|
|
result.fixedpoint = (Counter.QuadPart / Frequency.QuadPart) << 32;
|
|
uint64_t mod = Counter.QuadPart % Frequency.QuadPart;
|
|
result.fixedpoint += (mod * reciprocal) >> 16;
|
|
return result;
|
|
#else
|
|
struct timespec ts;
|
|
if (unlikely(clock_gettime(CLOCK_MONOTONIC, &ts)))
|
|
failure_perror("clock_gettime(CLOCK_MONOTONIC)", errno);
|
|
|
|
return from_timespec(ts);
|
|
#endif
|
|
}
|
|
|
|
} /* namespace chrono */
|