mirror of
https://github.com/kidfromjupiter/nearby.git
synced 2026-09-14 22:56:12 -04:00
Timothy Hutchins
ff9438a3ed
This is the start of the implementing for the Linux platform. I aim to make this as similar to the Windows platform as possible, although due to the fundamental difference in the two OS's, there will be things that need to be different. As such, I will be using the Windows platform files as a base, and reimplementing the functions with Linux equivalents. I am sure this will have bugs, which by my best attempt will be fixed when found.
69 lines
2.1 KiB
C++
69 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_LINUX_MUTEX_H_
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#define PLATFORM_IMPL_LINUX_MUTEX_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 "internal/platform/implementation/mutex.h"
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namespace nearby {
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namespace linux {
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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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absl::Mutex& GetMutex() { return mutex_; }
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std::recursive_mutex& GetRecursiveMutex() { return recursive_mutex_; }
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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 linux
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} // namespace nearby
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#endif // PLATFORM_IMPL_LINUX_MUTEX_H_
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