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https://github.com/kidfromjupiter/nearby.git
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70 lines
2.1 KiB
C++
70 lines
2.1 KiB
C++
// Copyright 2021 Google LLC
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//
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// Licensed under the Apache License, Version 2.0 (the "License");
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// you may not use this file except in compliance with the License.
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// You may obtain a copy of the License at
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//
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// https://www.apache.org/licenses/LICENSE-2.0
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//
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// Unless required by applicable law or agreed to in writing, software
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// distributed under the License is distributed on an "AS IS" BASIS,
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// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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// See the License for the specific language governing permissions and
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// limitations under the License.
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#ifndef PLATFORM_IMPL_WINDOWS_MUTEX_H_
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#define PLATFORM_IMPL_WINDOWS_MUTEX_H_
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#include <windows.h>
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#include <stdio.h>
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#include <synchapi.h>
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#include <memory>
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#include <mutex> // NOLINT
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#include "absl/memory/memory.h"
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#include "absl/synchronization/mutex.h"
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#include "platform/api/mutex.h"
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namespace location {
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namespace nearby {
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namespace windows {
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// A lock is a tool for controlling access to a shared resource by multiple
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// threads.
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// https://docs.oracle.com/javase/8/docs/api/java/util/concurrent/locks/Lock.html
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class ABSL_LOCKABLE Mutex : public api::Mutex {
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public:
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explicit Mutex(Mode mode) : mode_(mode) {}
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~Mutex() override = default;
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Mutex(Mutex&&) = delete;
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Mutex& operator=(Mutex&&) = delete;
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Mutex(const Mutex&) = delete;
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Mutex& operator=(const Mutex&) = delete;
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void Lock() ABSL_EXCLUSIVE_LOCK_FUNCTION() override {
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if (mode_ == Mode::kRegularNoCheck) mutex_.ForgetDeadlockInfo();
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if (mode_ == Mode::kRegular || mode_ == Mode::kRegularNoCheck) {
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mutex_.Lock();
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} else {
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recursive_mutex_.lock();
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}
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}
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void Unlock() ABSL_UNLOCK_FUNCTION() override {
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if (mode_ == Mode::kRegular || mode_ == Mode::kRegularNoCheck) {
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mutex_.Unlock();
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} else {
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recursive_mutex_.unlock();
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}
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}
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private:
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friend class ConditionVariable;
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absl::Mutex mutex_;
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std::recursive_mutex recursive_mutex_; // The actual mutex allocation
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Mode mode_;
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};
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} // namespace windows
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} // namespace nearby
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} // namespace location
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#endif // PLATFORM_IMPL_WINDOWS_MUTEX_H_
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