mirror of
https://github.com/isar/libmdbx.git
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148 lines
4.5 KiB
C++
148 lines
4.5 KiB
C++
/*
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* Copyright 2017-2022 Leonid Yuriev <leo@yuriev.ru>
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* and other libmdbx authors: please see AUTHORS file.
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted only as authorized by the OpenLDAP
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* Public License.
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*
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* A copy of this license is available in the file LICENSE in the
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* top-level directory of the distribution or, alternatively, at
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* <http://www.OpenLDAP.org/license.html>.
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*/
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#include "test.h"
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namespace chrono {
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#ifndef NSEC_PER_SEC
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#define NSEC_PER_SEC 1000000000u
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#endif /* NSEC_PER_SEC */
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uint32_t ns2fractional(uint32_t ns) {
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assert(ns < NSEC_PER_SEC);
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/* LY: здесь и далее используется "длинное деление", которое
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* для ясности кода оставлено как есть (без ручной оптимизации). Так как
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* GCC, Clang и даже MSVC сами давно умеют конвертировать деление на
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* константу в быструю reciprocal-форму. */
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return uint32_t((uint64_t(ns) << 32) / NSEC_PER_SEC);
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}
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uint32_t fractional2ns(uint32_t fractional) {
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return uint32_t((fractional * uint64_t(NSEC_PER_SEC)) >> 32);
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}
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#ifndef USEC_PER_SEC
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#define USEC_PER_SEC 1000000u
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#endif /* USEC_PER_SEC */
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uint32_t us2fractional(uint32_t us) {
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assert(us < USEC_PER_SEC);
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return uint32_t((uint64_t(us) << 32) / USEC_PER_SEC);
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}
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uint32_t fractional2us(uint32_t fractional) {
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return uint32_t((fractional * uint64_t(USEC_PER_SEC)) >> 32);
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}
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#ifndef MSEC_PER_SEC
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#define MSEC_PER_SEC 1000u
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#endif /* MSEC_PER_SEC */
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uint32_t ms2fractional(uint32_t ms) {
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assert(ms < MSEC_PER_SEC);
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return uint32_t((uint64_t(ms) << 32) / MSEC_PER_SEC);
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}
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uint32_t fractional2ms(uint32_t fractional) {
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return uint32_t((fractional * uint64_t(MSEC_PER_SEC)) >> 32);
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}
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time from_ns(uint64_t ns) {
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time result;
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result.fixedpoint =
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((ns / NSEC_PER_SEC) << 32) | ns2fractional(uint32_t(ns % NSEC_PER_SEC));
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return result;
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}
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time from_us(uint64_t us) {
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time result;
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result.fixedpoint =
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((us / USEC_PER_SEC) << 32) | us2fractional(uint32_t(us % USEC_PER_SEC));
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return result;
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}
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time from_ms(uint64_t ms) {
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time result;
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result.fixedpoint =
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((ms / MSEC_PER_SEC) << 32) | ms2fractional(uint32_t(ms % MSEC_PER_SEC));
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return result;
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}
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#if __GNUC_PREREQ(8, 0) && \
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(defined(__MINGW__) || defined(__MINGW32__) || defined(__MINGW64__))
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#pragma GCC diagnostic push
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#pragma GCC diagnostic ignored "-Wcast-function-type"
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#endif /* GCC/MINGW */
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time now_realtime() {
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#if defined(_WIN32) || defined(_WIN64) || defined(_WINDOWS)
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static void(WINAPI * query_time)(LPFILETIME);
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if (!query_time) {
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query_time = (void(WINAPI *)(LPFILETIME))GetProcAddress(
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GetModuleHandle(TEXT("kernel32.dll")),
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"GetSystemTimePreciseAsFileTime");
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if (!query_time)
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query_time = GetSystemTimeAsFileTime;
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}
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FILETIME filetime;
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query_time(&filetime);
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uint64_t ns100 =
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(uint64_t)filetime.dwHighDateTime << 32 | filetime.dwLowDateTime;
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return from_ns((ns100 - UINT64_C(116444736000000000)) * 100u);
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#else
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struct timespec ts;
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if (unlikely(clock_gettime(CLOCK_REALTIME, &ts)))
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failure_perror("clock_gettime(CLOCK_REALTIME", errno);
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return from_timespec(ts);
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#endif
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}
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time now_monotonic() {
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#if defined(_WIN32) || defined(_WIN64) || defined(_WINDOWS)
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static uint64_t reciprocal;
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static LARGE_INTEGER Frequency;
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if (reciprocal == 0) {
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if (!QueryPerformanceFrequency(&Frequency))
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failure_perror("QueryPerformanceFrequency()", GetLastError());
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reciprocal = (((UINT64_C(1) << 48) + Frequency.QuadPart / 2 + 1) /
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Frequency.QuadPart);
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assert(reciprocal);
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}
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LARGE_INTEGER Counter;
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if (!QueryPerformanceCounter(&Counter))
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failure_perror("QueryPerformanceCounter()", GetLastError());
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time result;
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result.fixedpoint = (Counter.QuadPart / Frequency.QuadPart) << 32;
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uint64_t mod = Counter.QuadPart % Frequency.QuadPart;
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result.fixedpoint += (mod * reciprocal) >> 16;
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return result;
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#else
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struct timespec ts;
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if (unlikely(clock_gettime(CLOCK_MONOTONIC, &ts)))
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failure_perror("clock_gettime(CLOCK_MONOTONIC)", errno);
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return from_timespec(ts);
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#endif
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}
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#if __GNUC_PREREQ(8, 0) && \
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(defined(__MINGW__) || defined(__MINGW32__) || defined(__MINGW64__))
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#pragma GCC diagnostic pop
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#endif /* GCC/MINGW */
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} /* namespace chrono */
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