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129 lines
4.0 KiB
129 lines
4.0 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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#ifndef ART_LIBARTBASE_BASE_TIME_UTILS_H_
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#define ART_LIBARTBASE_BASE_TIME_UTILS_H_
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#ifdef _WIN32
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#include <stdio.h> // Needed for correct macro definitions.
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#endif
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#include <time.h>
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#include <cstdint>
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#include <string>
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namespace art {
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enum TimeUnit {
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kTimeUnitNanosecond,
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kTimeUnitMicrosecond,
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kTimeUnitMillisecond,
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kTimeUnitSecond,
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};
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// Constants for common time periods.
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constexpr unsigned int kOneMinuteInSeconds = 60;
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constexpr unsigned int kOneHourInSeconds = 60 * kOneMinuteInSeconds;
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// Returns a human-readable time string which prints every nanosecond while trying to limit the
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// number of trailing zeros. Prints using the largest human readable unit up to a second.
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// e.g. "1ms", "1.000000001s", "1.001us"
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std::string PrettyDuration(uint64_t nano_duration, size_t max_fraction_digits = 3);
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// Format a nanosecond time to specified units.
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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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// Get the appropriate unit for a nanosecond duration.
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TimeUnit GetAppropriateTimeUnit(uint64_t nano_duration);
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// Get the divisor to convert from a nanoseconds to a time unit.
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uint64_t GetNsToTimeUnitDivisor(TimeUnit time_unit);
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// Returns the current date in ISO yyyy-mm-dd hh:mm:ss format.
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std::string GetIsoDate();
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// Returns the monotonic time since some unspecified starting point in milliseconds.
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uint64_t MilliTime();
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// Returns the monotonic time since some unspecified starting point in microseconds.
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uint64_t MicroTime();
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// Returns the monotonic time since some unspecified starting point in nanoseconds.
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uint64_t NanoTime();
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// Returns the thread-specific CPU-time clock in nanoseconds or -1 if unavailable.
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uint64_t ThreadCpuNanoTime();
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// Returns the process CPU-time clock in nanoseconds or -1 if unavailable.
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uint64_t ProcessCpuNanoTime();
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// Converts the given number of nanoseconds to milliseconds.
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static constexpr uint64_t NsToMs(uint64_t ns) {
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return ns / 1000 / 1000;
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}
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// Converts the given number of nanoseconds to microseconds.
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static constexpr uint64_t NsToUs(uint64_t ns) {
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return ns / 1000;
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}
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// Converts the given number of milliseconds to nanoseconds
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static constexpr uint64_t MsToNs(uint64_t ms) {
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return ms * 1000 * 1000;
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}
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// Converts the given number of milliseconds to microseconds
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static constexpr uint64_t MsToUs(uint64_t ms) {
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return ms * 1000;
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}
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static constexpr uint64_t UsToNs(uint64_t us) {
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return us * 1000;
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}
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static constexpr uint64_t SecondsToMs(uint64_t seconds) {
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return seconds * 1000;
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}
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static constexpr time_t SaturatedTimeT(int64_t secs) {
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if (sizeof(time_t) < sizeof(int64_t)) {
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return static_cast<time_t>(std::min(secs,
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static_cast<int64_t>(std::numeric_limits<time_t>::max())));
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} else {
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return secs;
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}
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}
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#if defined(__APPLE__)
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#ifndef CLOCK_REALTIME
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// No clocks to specify on OS/X < 10.12, fake value to pass to routines that require a clock.
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#define CLOCK_REALTIME 0xebadf00d
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#endif
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#endif
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// Sleep for the given number of nanoseconds, a bad way to handle contention.
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void NanoSleep(uint64_t ns);
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// Initialize a timespec to either a relative time (ms,ns), or to the absolute
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// time corresponding to the indicated clock value plus the supplied offset.
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void InitTimeSpec(bool absolute, int clock, int64_t ms, int32_t ns, timespec* ts);
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} // namespace art
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#endif // ART_LIBARTBASE_BASE_TIME_UTILS_H_
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