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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 <zircon/syscalls.h>
#include "base/compiler_specific.h"
#include "base/numerics/checked_math.h"
#include "base/time/time_override.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 ZxTimeToMicroseconds(zx_time_t nanos) {
const zx_time_t micros =
nanos / static_cast<zx_time_t>(base::Time::kNanosecondsPerMicrosecond);
return static_cast<int64_t>(micros);
}
} // namespace
// Time -----------------------------------------------------------------------
namespace subtle {
Time TimeNowIgnoringOverride() {
const zx_time_t nanos_since_unix_epoch = zx_clock_get(ZX_CLOCK_UTC);
CHECK(nanos_since_unix_epoch != 0);
// The following expression will overflow in the year 289938 A.D.:
return Time() + TimeDelta::FromMicroseconds(
ZxTimeToMicroseconds(nanos_since_unix_epoch) +
Time::kTimeTToMicrosecondsOffset);
}
Time TimeNowFromSystemTimeIgnoringOverride() {
// Just use TimeNowIgnoringOverride() because it returns the system time.
return TimeNowIgnoringOverride();
}
} // namespace subtle
// TimeTicks ------------------------------------------------------------------
namespace subtle {
TimeTicks TimeTicksNowIgnoringOverride() {
const zx_time_t nanos_since_boot = zx_clock_get(ZX_CLOCK_MONOTONIC);
CHECK(nanos_since_boot != 0);
return TimeTicks() +
TimeDelta::FromMicroseconds(ZxTimeToMicroseconds(nanos_since_boot));
}
} // namespace subtle
// static
TimeTicks::Clock TimeTicks::GetClock() {
return Clock::FUCHSIA_ZX_CLOCK_MONOTONIC;
}
// static
bool TimeTicks::IsHighResolution() {
return true;
}
// static
bool TimeTicks::IsConsistentAcrossProcesses() {
return true;
}
// static
TimeTicks TimeTicks::FromZxTime(zx_time_t nanos_since_boot) {
return TimeTicks(ZxTimeToMicroseconds(nanos_since_boot));
}
zx_time_t TimeTicks::ToZxTime() const {
CheckedNumeric<zx_time_t> result(base::Time::kNanosecondsPerMicrosecond);
result *= us_;
return result.ValueOrDie();
}
// ThreadTicks ----------------------------------------------------------------
namespace subtle {
ThreadTicks ThreadTicksNowIgnoringOverride() {
const zx_time_t nanos_since_thread_started = zx_clock_get(ZX_CLOCK_THREAD);
CHECK(nanos_since_thread_started != 0);
return ThreadTicks() + TimeDelta::FromMicroseconds(
ZxTimeToMicroseconds(nanos_since_thread_started));
}
} // namespace subtle
} // namespace base
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