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// Copyright 2020 The Pigweed Authors
// Licensed under the Apache License, Version 2.0 (the "License"); you may not
// use this file except in compliance with the License. You may obtain a copy of
// the License at
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
// WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
// License for the specific language governing permissions and limitations under
// the License.
#pragma once
#include <mutex>
namespace pw::sync::backend {
// The NativeMutex class adds a flag that tracks whether the std::timed_mutex is
// locked. The C++ standard states that misusing a mutex is undefined behavior,
// so library implementations may simply ignore misuse. This ensures misuse hits
// a PW_CHECK.
struct NativeMutex {
// The locked state is tracked in a variable. This function asserts if the
// state is inconsistent (e.g. unlocking an unlocked mutex).
void SetLockedState(bool new_state);
std::timed_mutex mutex;
bool locked = false;
using NativeMutexHandle = std::timed_mutex&;
} // namespace pw::sync::backend