53 lines
1.6 KiB
C++
53 lines
1.6 KiB
C++
// Copyright 2010-2017 Google
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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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#include "ortools/base/time_support.h"
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#if !defined(_MSC_VER)
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#include <sys/time.h>
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#else
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#include <windows.h>
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#endif
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#if defined(__APPLE__) && defined(__GNUC__)
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#include <mach/mach_time.h>
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#endif
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#include <ctime>
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namespace absl {
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int64 GetCurrentTimeNanos() {
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#if defined(_MSC_VER)
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const double kSecInNanoSeconds = 1000000000.0;
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LARGE_INTEGER l_freq;
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if (!QueryPerformanceFrequency(&l_freq)) {
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return 0;
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}
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const double freq = static_cast<double>(l_freq.QuadPart) / kSecInNanoSeconds;
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LARGE_INTEGER now;
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QueryPerformanceCounter(&now);
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return static_cast<int64>(now.QuadPart / freq);
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#elif defined(__APPLE__) && defined(__GNUC__)
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int64 time = mach_absolute_time();
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mach_timebase_info_data_t info;
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kern_return_t err = mach_timebase_info(&info);
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return err == 0 ? time * info.numer / info.denom : 0;
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#elif defined(__GNUC__) // Linux
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const int64 kSecondInNanoSeconds = 1000000000;
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struct timespec current;
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clock_gettime(CLOCK_REALTIME, ¤t);
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return current.tv_sec * kSecondInNanoSeconds + current.tv_nsec;
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#endif
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}
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} // namespace absl
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