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// Copyright 2017 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 "base/time/time.h"
#include <magenta/syscalls.h>
#include "base/compiler_specific.h"
namespace base {
namespace {
// Helper function to map an unsigned integer with nanosecond timebase to a
// signed integer with microsecond timebase.
ALWAYS_INLINE int64_t MxTimeToMicroseconds(mx_time_t nanos) {
const mx_time_t micros =
nanos / static_cast<mx_time_t>(base::Time::kNanosecondsPerMicrosecond);
return static_cast<int64_t>(micros);
}
} // namespace
// Time -----------------------------------------------------------------------
// static
Time Time::Now() {
const mx_time_t nanos_since_unix_epoch = mx_time_get(MX_CLOCK_UTC);
CHECK(nanos_since_unix_epoch != 0);
// The following expression will overflow in the year 289938 A.D.:
return Time(MxTimeToMicroseconds(nanos_since_unix_epoch) +
kTimeTToMicrosecondsOffset);
}
// static
Time Time::NowFromSystemTime() {
return Now();
}
// TimeTicks ------------------------------------------------------------------
// static
TimeTicks TimeTicks::Now() {
const mx_time_t nanos_since_boot = mx_time_get(MX_CLOCK_MONOTONIC);
CHECK(nanos_since_boot != 0);
return TimeTicks(MxTimeToMicroseconds(nanos_since_boot));
}
// static
TimeTicks::Clock TimeTicks::GetClock() {
return Clock::FUCHSIA_MX_CLOCK_MONOTONIC;
}
// static
bool TimeTicks::IsHighResolution() {
return true;
}
// static
bool TimeTicks::IsConsistentAcrossProcesses() {
return true;
}
// static
TimeTicks TimeTicks::FromMXTime(mx_time_t nanos_since_boot) {
return TimeTicks(MxTimeToMicroseconds(nanos_since_boot));
}
// static
ThreadTicks ThreadTicks::Now() {
const mx_time_t nanos_since_thread_started = mx_time_get(MX_CLOCK_THREAD);
CHECK(nanos_since_thread_started != 0);
return ThreadTicks(MxTimeToMicroseconds(nanos_since_thread_started));
}
} // namespace base
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