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// Copyright 2021 Google LLC
//
// 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
//
// https://www.apache.org/licenses/LICENSE-2.0
//
// 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.
#ifndef PLATFORM_IMPL_WINDOWS_MUTEX_H_
#define PLATFORM_IMPL_WINDOWS_MUTEX_H_
#include <windows.h>
#include <stdio.h>
#include <synchapi.h>
#include <memory>
#include <mutex> // NOLINT
#include "absl/memory/memory.h"
#include "absl/synchronization/mutex.h"
#include "platform/api/mutex.h"
namespace location {
namespace nearby {
namespace windows {
// A lock is a tool for controlling access to a shared resource by multiple
// threads.
// https://docs.oracle.com/javase/8/docs/api/java/util/concurrent/locks/Lock.html
class ABSL_LOCKABLE Mutex : public api::Mutex {
public:
explicit Mutex(Mode mode) : mode_(mode) {}
~Mutex() override = default;
Mutex(Mutex&&) = delete;
Mutex& operator=(Mutex&&) = delete;
Mutex(const Mutex&) = delete;
Mutex& operator=(const Mutex&) = delete;
void Lock() ABSL_EXCLUSIVE_LOCK_FUNCTION() override {
if (mode_ == Mode::kRegularNoCheck) mutex_.ForgetDeadlockInfo();
if (mode_ == Mode::kRegular || mode_ == Mode::kRegularNoCheck) {
mutex_.Lock();
} else {
recursive_mutex_.lock();
}
}
void Unlock() ABSL_UNLOCK_FUNCTION() override {
if (mode_ == Mode::kRegular || mode_ == Mode::kRegularNoCheck) {
mutex_.Unlock();
} else {
recursive_mutex_.unlock();
}
}
private:
friend class ConditionVariable;
absl::Mutex mutex_;
std::recursive_mutex recursive_mutex_; // The actual mutex allocation
Mode mode_;
};
} // namespace windows
} // namespace nearby
} // namespace location
#endif // PLATFORM_IMPL_WINDOWS_MUTEX_H_