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