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| 1 // Copyright 2014 The Crashpad Authors. All rights reserved. |
| 2 // |
| 3 // Licensed under the Apache License, Version 2.0 (the "License"); |
| 4 // you may not use this file except in compliance with the License. |
| 5 // You may obtain a copy of the License at |
| 6 // |
| 7 // http://www.apache.org/licenses/LICENSE-2.0 |
| 8 // |
| 9 // Unless required by applicable law or agreed to in writing, software |
| 10 // distributed under the License is distributed on an "AS IS" BASIS, |
| 11 // WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
| 12 // See the License for the specific language governing permissions and |
| 13 // limitations under the License. |
| 14 |
| 15 #include "util/misc/clock.h" |
| 16 |
| 17 #include <sys/types.h> |
| 18 #include <windows.h> |
| 19 |
| 20 namespace { |
| 21 |
| 22 LARGE_INTEGER QpcFrequencyInternal() { |
| 23 LARGE_INTEGER frequency; |
| 24 QueryPerformanceFrequency(&frequency); |
| 25 return frequency; |
| 26 } |
| 27 |
| 28 int64_t QpcFrequency() { |
| 29 static LARGE_INTEGER frequency = QpcFrequencyInternal(); |
| 30 return frequency.QuadPart; |
| 31 } |
| 32 |
| 33 } // namespace |
| 34 |
| 35 namespace crashpad { |
| 36 |
| 37 uint64_t ClockMonotonicNanoseconds() { |
| 38 LARGE_INTEGER time; |
| 39 QueryPerformanceCounter(&time); |
| 40 int64_t frequency = QpcFrequency(); |
| 41 int64_t whole_seconds = time.QuadPart / frequency; |
| 42 int64_t leftover_ticks = time.QuadPart / (whole_seconds * frequency); |
| 43 const int64_t kNanosecondsPerSecond = static_cast<const int64_t>(1E9); |
| 44 return (whole_seconds * kNanosecondsPerSecond) + |
| 45 ((leftover_ticks * kNanosecondsPerSecond) / frequency); |
| 46 } |
| 47 |
| 48 } // namespace crashpad |
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