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268 lines
7.2 KiB
268 lines
7.2 KiB
/*
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* Copyright (C) 2015 The Android Open Source Project
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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#include "time_utils.h"
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#include <inttypes.h>
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#include <stdio.h>
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#include <limits>
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#include <sstream>
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#include "android-base/stringprintf.h"
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#include "logging.h"
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#if defined(__APPLE__)
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#include <sys/time.h>
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#endif
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namespace art {
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namespace {
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#if !defined(__linux__)
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int GetTimeOfDay(struct timeval* tv, struct timezone* tz) {
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#ifdef _WIN32
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return mingw_gettimeofday(tv, tz);
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#else
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return gettimeofday(tv, tz);
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#endif
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}
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#endif
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} // namespace
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using android::base::StringPrintf;
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std::string PrettyDuration(uint64_t nano_duration, size_t max_fraction_digits) {
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if (nano_duration == 0) {
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return "0";
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} else {
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return FormatDuration(nano_duration, GetAppropriateTimeUnit(nano_duration),
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max_fraction_digits);
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}
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}
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TimeUnit GetAppropriateTimeUnit(uint64_t nano_duration) {
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const uint64_t one_sec = 1000 * 1000 * 1000;
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const uint64_t one_ms = 1000 * 1000;
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const uint64_t one_us = 1000;
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if (nano_duration >= one_sec) {
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return kTimeUnitSecond;
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} else if (nano_duration >= one_ms) {
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return kTimeUnitMillisecond;
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} else if (nano_duration >= one_us) {
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return kTimeUnitMicrosecond;
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} else {
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return kTimeUnitNanosecond;
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}
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}
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uint64_t GetNsToTimeUnitDivisor(TimeUnit time_unit) {
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const uint64_t one_sec = 1000 * 1000 * 1000;
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const uint64_t one_ms = 1000 * 1000;
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const uint64_t one_us = 1000;
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switch (time_unit) {
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case kTimeUnitSecond:
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return one_sec;
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case kTimeUnitMillisecond:
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return one_ms;
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case kTimeUnitMicrosecond:
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return one_us;
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case kTimeUnitNanosecond:
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return 1;
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}
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return 0;
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}
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std::string FormatDuration(uint64_t nano_duration, TimeUnit time_unit,
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size_t max_fraction_digits) {
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const char* unit = nullptr;
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uint64_t divisor = GetNsToTimeUnitDivisor(time_unit);
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switch (time_unit) {
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case kTimeUnitSecond:
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unit = "s";
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break;
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case kTimeUnitMillisecond:
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unit = "ms";
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break;
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case kTimeUnitMicrosecond:
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unit = "us";
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break;
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case kTimeUnitNanosecond:
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unit = "ns";
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break;
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}
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const uint64_t whole_part = nano_duration / divisor;
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uint64_t fractional_part = nano_duration % divisor;
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if (fractional_part == 0) {
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return StringPrintf("%" PRIu64 "%s", whole_part, unit);
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} else {
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static constexpr size_t kMaxDigits = 30;
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size_t avail_digits = kMaxDigits;
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char fraction_buffer[kMaxDigits];
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char* ptr = fraction_buffer;
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uint64_t multiplier = 10;
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// This infinite loops if fractional part is 0.
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while (avail_digits > 1 && fractional_part * multiplier < divisor) {
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multiplier *= 10;
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*ptr++ = '0';
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avail_digits--;
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}
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snprintf(ptr, avail_digits, "%" PRIu64, fractional_part);
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fraction_buffer[std::min(kMaxDigits - 1, max_fraction_digits)] = '\0';
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return StringPrintf("%" PRIu64 ".%s%s", whole_part, fraction_buffer, unit);
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}
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}
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std::string GetIsoDate() {
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tm tmbuf;
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int ns;
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#ifdef _WIN32
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time_t now = time(nullptr);
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localtime_s(&tmbuf, &now);
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ns = 0;
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#else
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if (__builtin_available(macOS 10.12, *)) {
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timespec now;
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clock_gettime(CLOCK_REALTIME, &now);
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localtime_r(&now.tv_sec, &tmbuf);
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ns = now.tv_nsec;
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} else {
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time_t now = time(nullptr);
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localtime_r(&now, &tmbuf);
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ns = 0;
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}
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#endif
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char zone[16] = {};
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strftime(zone, sizeof(zone), "%z", &tmbuf);
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return StringPrintf("%04d-%02d-%02d %02d:%02d:%02d.%09d%s",
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tmbuf.tm_year + 1900, tmbuf.tm_mon+1, tmbuf.tm_mday,
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tmbuf.tm_hour, tmbuf.tm_min, tmbuf.tm_sec, ns, zone);
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}
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uint64_t MilliTime() {
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#if defined(__linux__)
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timespec now;
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clock_gettime(CLOCK_MONOTONIC, &now);
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return static_cast<uint64_t>(now.tv_sec) * UINT64_C(1000) + now.tv_nsec / UINT64_C(1000000);
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#else
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timeval now;
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GetTimeOfDay(&now, nullptr);
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return static_cast<uint64_t>(now.tv_sec) * UINT64_C(1000) + now.tv_usec / UINT64_C(1000);
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#endif
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}
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uint64_t MicroTime() {
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#if defined(__linux__)
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timespec now;
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clock_gettime(CLOCK_MONOTONIC, &now);
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return static_cast<uint64_t>(now.tv_sec) * UINT64_C(1000000) + now.tv_nsec / UINT64_C(1000);
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#else
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timeval now;
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GetTimeOfDay(&now, nullptr);
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return static_cast<uint64_t>(now.tv_sec) * UINT64_C(1000000) + now.tv_usec;
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#endif
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}
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uint64_t NanoTime() {
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#if defined(__linux__)
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timespec now;
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clock_gettime(CLOCK_MONOTONIC, &now);
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return static_cast<uint64_t>(now.tv_sec) * UINT64_C(1000000000) + now.tv_nsec;
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#else
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timeval now;
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GetTimeOfDay(&now, nullptr);
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return static_cast<uint64_t>(now.tv_sec) * UINT64_C(1000000000) + now.tv_usec * UINT64_C(1000);
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#endif
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}
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uint64_t ThreadCpuNanoTime() {
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#if defined(__linux__)
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timespec now;
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clock_gettime(CLOCK_THREAD_CPUTIME_ID, &now);
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return static_cast<uint64_t>(now.tv_sec) * UINT64_C(1000000000) + now.tv_nsec;
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#else
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UNIMPLEMENTED(WARNING);
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return -1;
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#endif
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}
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uint64_t ProcessCpuNanoTime() {
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#if defined(__linux__)
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timespec now;
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clock_gettime(CLOCK_PROCESS_CPUTIME_ID, &now);
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return static_cast<uint64_t>(now.tv_sec) * UINT64_C(1000000000) + now.tv_nsec;
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#else
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// We cannot use clock_gettime() here. Return the process wall clock time
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// (using art::NanoTime, which relies on gettimeofday()) as approximation of
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// the process CPU time instead.
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//
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// Note: clock_gettime() is available from macOS 10.12 (Darwin 16), but we try
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// to keep things simple here.
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return NanoTime();
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#endif
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}
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void NanoSleep(uint64_t ns) {
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timespec tm;
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tm.tv_sec = SaturatedTimeT(ns / MsToNs(1000));
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tm.tv_nsec = ns - static_cast<uint64_t>(tm.tv_sec) * MsToNs(1000);
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nanosleep(&tm, nullptr);
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}
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void InitTimeSpec(bool absolute, int clock, int64_t ms, int32_t ns, timespec* ts) {
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if (absolute) {
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#if defined(__linux__)
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clock_gettime(clock, ts);
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#else
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UNUSED(clock);
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timeval tv;
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GetTimeOfDay(&tv, nullptr);
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ts->tv_sec = tv.tv_sec;
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ts->tv_nsec = tv.tv_usec * 1000;
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#endif
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} else {
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ts->tv_sec = 0;
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ts->tv_nsec = 0;
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}
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int64_t end_sec = ts->tv_sec + ms / 1000;
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constexpr int32_t int32_max = std::numeric_limits<int32_t>::max();
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if (UNLIKELY(end_sec >= int32_max)) {
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// Either ms was intended to denote an infinite timeout, or we have a
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// problem. The former generally uses the largest possible millisecond
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// or nanosecond value. Log only in the latter case.
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constexpr int64_t int64_max = std::numeric_limits<int64_t>::max();
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if (ms != int64_max && ms != int64_max / (1000 * 1000)) {
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LOG(INFO) << "Note: end time exceeds INT32_MAX: " << end_sec;
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}
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end_sec = int32_max - 1; // Allow for increment below.
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}
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ts->tv_sec = end_sec;
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ts->tv_nsec = (ts->tv_nsec + (ms % 1000) * 1000000) + ns;
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// Catch rollover.
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if (ts->tv_nsec >= 1000000000L) {
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ts->tv_sec++;
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ts->tv_nsec -= 1000000000L;
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}
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}
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} // namespace art
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