src/lib/timekeeper/monotonic_test_clock_base.cc

// Copyright 2018 The Fuchsia 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 "src/lib/timekeeper/monotonic_test_clock_base.h"

#include <algorithm>
#include <type_traits>

namespace timekeeper {
namespace {

// Returns the starting value for the given clock. Ensures that
// |ZX_CLOCK_MONOTONIC| has a starting value of zero.
zx_time_t GetClockStartingValue(zx_clock_t clock_id) {
  return (clock_id - ZX_CLOCK_MONOTONIC) * ZX_HOUR(24);
}
}  // namespace

MonotonicTestClockBase::MonotonicTestClockBase(fit::function<zx_time_t()> clock)
    : clock_(std::move(clock)) {}

MonotonicTestClockBase::~MonotonicTestClockBase() = default;

zx_status_t MonotonicTestClockBase::GetTime(zx_clock_t clock_id, zx_time_t* time) const {
  *time = GetClockStartingValue(clock_id) + GetMonotonicTime();
  return ZX_OK;
}

zx_time_t MonotonicTestClockBase::GetMonotonicTime() const {
  zx_time_t result = std::max(clock_(), last_returned_value_ + 1);
  last_returned_value_ = result;
  return result;
}

}  // namespace timekeeper