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// Copyright 2022 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 NativeRecursiveMutex class adds a flag that tracks how many times the
// std::recursive_mutex has been 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_ASSERT.
struct NativeRecursiveMutex {
std::recursive_mutex mutex;
unsigned lock_count = 0;
using NativeRecursiveMutexHandle = std::recursive_mutex&;
} // namespace pw::sync::backend