mirror of
https://github.com/klzgrad/naiveproxy.git
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94 lines
2.0 KiB
C++
94 lines
2.0 KiB
C++
// Copyright 2018 The Chromium Authors. All rights reserved.
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// Use of this source code is governed by a BSD-style license that can be
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// found in the LICENSE file.
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#include "ticks.h"
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#include "base/logging.h"
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#include "build_config.h"
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#if defined(OS_WIN)
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#include <windows.h>
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#elif defined(OS_MACOSX)
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#include <mach/mach_time.h>
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#elif defined(OS_LINUX) || defined(OS_AIX)
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#include <time.h>
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#else
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#error Port.
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#endif
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namespace {
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bool g_initialized;
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#if defined(OS_WIN)
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LARGE_INTEGER g_frequency;
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LARGE_INTEGER g_start;
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#elif defined(OS_MACOSX)
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mach_timebase_info_data_t g_timebase;
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uint64_t g_start;
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#elif defined(OS_LINUX) || defined(OS_AIX)
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uint64_t g_start;
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#else
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#error Port.
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#endif
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constexpr uint64_t kNano = 1'000'000'000;
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void Init() {
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DCHECK(!g_initialized);
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#if defined(OS_WIN)
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QueryPerformanceFrequency(&g_frequency);
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QueryPerformanceCounter(&g_start);
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#elif defined(OS_MACOSX)
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mach_timebase_info(&g_timebase);
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g_start = (mach_absolute_time() * g_timebase.numer) / g_timebase.denom;
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#elif defined(OS_LINUX) || defined(OS_AIX)
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struct timespec ts;
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clock_gettime(CLOCK_MONOTONIC, &ts);
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g_start = static_cast<uint64_t>(ts.tv_sec) * kNano +
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static_cast<uint64_t>(ts.tv_nsec);
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#else
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#error Port.
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#endif
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g_initialized = true;
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}
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} // namespace
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Ticks TicksNow() {
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static bool initialized = []() {
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Init();
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return true;
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}();
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DCHECK(initialized);
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Ticks now;
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#if defined(OS_WIN)
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LARGE_INTEGER t;
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QueryPerformanceCounter(&t);
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now = ((t.QuadPart - g_start.QuadPart) * kNano) / g_frequency.QuadPart;
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#elif defined(OS_MACOSX)
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now =
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((mach_absolute_time() * g_timebase.numer) / g_timebase.denom) - g_start;
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#elif defined(OS_LINUX) || defined(OS_AIX)
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struct timespec ts;
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clock_gettime(CLOCK_MONOTONIC, &ts);
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now = (static_cast<uint64_t>(ts.tv_sec) * kNano +
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static_cast<uint64_t>(ts.tv_nsec)) -
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g_start;
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#else
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#error Port.
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#endif
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return now;
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}
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TickDelta TicksDelta(Ticks new_ticks, Ticks old_ticks) {
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DCHECK(new_ticks >= old_ticks);
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return TickDelta(new_ticks - old_ticks);
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}
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