100 lines
3.1 KiB
C++
100 lines
3.1 KiB
C++
/*
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Copyright (c) 2005-2021 Intel Corporation
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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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http://www.apache.org/licenses/LICENSE-2.0
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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 __TBB_tick_count_H
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#define __TBB_tick_count_H
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#include <chrono>
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#include "detail/_namespace_injection.h"
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namespace tbb {
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namespace detail {
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namespace d1 {
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//! Absolute timestamp
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/** @ingroup timing */
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class tick_count {
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public:
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using clock_type = typename std::conditional<std::chrono::high_resolution_clock::is_steady,
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std::chrono::high_resolution_clock, std::chrono::steady_clock>::type;
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//! Relative time interval.
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class interval_t : public clock_type::duration {
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public:
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//! Construct a time interval representing zero time duration
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interval_t() : clock_type::duration(clock_type::duration::zero()) {}
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//! Construct a time interval representing sec seconds time duration
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explicit interval_t( double sec )
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: clock_type::duration(std::chrono::duration_cast<clock_type::duration>(std::chrono::duration<double>(sec))) {}
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//! Return the length of a time interval in seconds
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double seconds() const {
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return std::chrono::duration_cast<std::chrono::duration<double>>(*this).count();
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}
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//! Extract the intervals from the tick_counts and subtract them.
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friend interval_t operator-( const tick_count& t1, const tick_count& t0 );
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//! Add two intervals.
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friend interval_t operator+( const interval_t& i, const interval_t& j ) {
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return interval_t(std::chrono::operator+(i, j));
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}
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//! Subtract two intervals.
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friend interval_t operator-( const interval_t& i, const interval_t& j ) {
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return interval_t(std::chrono::operator-(i, j));
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}
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private:
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explicit interval_t( clock_type::duration value_ ) : clock_type::duration(value_) {}
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};
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tick_count() = default;
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//! Return current time.
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static tick_count now() {
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return clock_type::now();
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}
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//! Subtract two timestamps to get the time interval between
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friend interval_t operator-( const tick_count& t1, const tick_count& t0 ) {
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return tick_count::interval_t(t1.my_time_point - t0.my_time_point);
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}
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//! Return the resolution of the clock in seconds per tick.
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static double resolution() {
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return static_cast<double>(interval_t::period::num) / interval_t::period::den;
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}
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private:
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clock_type::time_point my_time_point;
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tick_count( clock_type::time_point tp ) : my_time_point(tp) {}
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};
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} // namespace d1
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} // namespace detail
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inline namespace v1 {
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using detail::d1::tick_count;
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} // namespace v1
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} // namespace tbb
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#endif /* __TBB_tick_count_H */
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