57 lines
1.8 KiB
C++
57 lines
1.8 KiB
C++
// Copyright 2014 The Crashpad Authors
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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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#include "util/misc/clock.h"
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#include <windows.h>
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#include <sys/types.h>
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namespace {
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LARGE_INTEGER QpcFrequencyInternal() {
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LARGE_INTEGER frequency;
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QueryPerformanceFrequency(&frequency);
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return frequency;
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}
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int64_t QpcFrequency() {
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static LARGE_INTEGER frequency = QpcFrequencyInternal();
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return frequency.QuadPart;
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}
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} // namespace
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namespace crashpad {
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uint64_t ClockMonotonicNanoseconds() {
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LARGE_INTEGER time;
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QueryPerformanceCounter(&time);
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int64_t frequency = QpcFrequency();
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int64_t whole_seconds = time.QuadPart / frequency;
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int64_t leftover_ticks = time.QuadPart % frequency;
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constexpr int64_t kNanosecondsPerSecond = static_cast<const int64_t>(1E9);
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return (whole_seconds * kNanosecondsPerSecond) +
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((leftover_ticks * kNanosecondsPerSecond) / frequency);
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}
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void SleepNanoseconds(uint64_t nanoseconds) {
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// This is both inaccurate (will be way too long for short sleeps) and
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// incorrect (can sleep for less than requested). But it's what's available
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// without implementing a busy loop.
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constexpr uint64_t kNanosecondsPerMillisecond = static_cast<uint64_t>(1E6);
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Sleep(static_cast<DWORD>(nanoseconds / kNanosecondsPerMillisecond));
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}
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} // namespace crashpad
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