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| // Copyright 2013 The Flutter Authors. All rights reserved. | ||
| // Use of this source code is governed by a BSD-style license that can be | ||
| // found in the LICENSE file. | ||
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| #ifndef FLUTTER_FML_THREADSAFE_UNIQUE_PTR_H_ | ||
| #define FLUTTER_FML_THREADSAFE_UNIQUE_PTR_H_ | ||
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| #include <memory> | ||
| #include <mutex> | ||
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| #include "flutter/fml/macros.h" | ||
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| namespace fml { | ||
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| /// A single-owner smart pointer that allows weak references that can be | ||
| /// accessed on different threads. | ||
| /// This smart-pointer makes the following guarantees: | ||
| /// * There is only ever one threadsafe_unique_ptr per object. | ||
| /// * The object is deleted when ~threadsafe_unique_ptr() is called. | ||
| /// * The object will not be deleted whilst another thread has a lock_ptr. | ||
| /// * The thread that owns the object can access it without a lock. | ||
| /// WARNING: weak_ptr's should only be used to invoke thread-safe methods. | ||
| template <typename T> | ||
| class threadsafe_unique_ptr { | ||
| private: | ||
| struct Data { | ||
| Data(std::unique_ptr<T>&& arg_ptr) : ptr(std::move(arg_ptr)) {} | ||
| std::unique_ptr<T> ptr; | ||
| std::mutex mutex; | ||
| }; | ||
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| public: | ||
| threadsafe_unique_ptr() | ||
| : data_(new Data(std::unique_ptr<T>())), fast_ptr_(nullptr) {} | ||
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| threadsafe_unique_ptr(std::unique_ptr<T>&& ptr) | ||
| : data_(new Data(std::move(ptr))) { | ||
| fast_ptr_ = data_->ptr.get(); | ||
| } | ||
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| threadsafe_unique_ptr(threadsafe_unique_ptr<T>&& ptr) | ||
| : data_(std::move(ptr.data_)), fast_ptr_(std::move(ptr.fast_ptr_)) {} | ||
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| threadsafe_unique_ptr& operator=(threadsafe_unique_ptr&& rvalue) { | ||
| data_ = std::move(rvalue.data_); | ||
| fast_ptr_ = std::move(rvalue.fast_ptr_); | ||
| return *this; | ||
| } | ||
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| ~threadsafe_unique_ptr() { | ||
| if (data_) { | ||
| std::scoped_lock lock(data_->mutex); | ||
| data_->ptr.reset(); | ||
| } | ||
| } | ||
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| T* operator->() const { return fast_ptr_; } | ||
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| T* get() const { return fast_ptr_; } | ||
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| operator bool() const { return fast_ptr_ != nullptr; } | ||
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| class lock_ptr; | ||
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| /// A non-owning smart pointer for a `threadsafe_unique_ptr`. | ||
| class weak_ptr { | ||
| public: | ||
| weak_ptr() {} | ||
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| weak_ptr(std::weak_ptr<Data> weak_ptr) : weak_ptr_(weak_ptr) {} | ||
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| private: | ||
| friend class lock_ptr; | ||
| std::weak_ptr<Data> weak_ptr_; | ||
| }; | ||
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| /// A temporary owning smart pointer for a `threadsafe_unique_ptr`. This | ||
| /// guarantees that the object will not be deleted while in scope. | ||
| class lock_ptr { | ||
| public: | ||
| lock_ptr(const weak_ptr& weak) : strong_ptr_(weak.weak_ptr_.lock()) { | ||
| if (strong_ptr_) { | ||
| lock_ = std::unique_lock(strong_ptr_->mutex); | ||
| } | ||
| } | ||
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| T* operator->() { return strong_ptr_ ? strong_ptr_->ptr.get() : nullptr; } | ||
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| operator bool() const { | ||
| return strong_ptr_ ? static_cast<bool>(strong_ptr_->ptr) : false; | ||
| } | ||
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| private: | ||
| FML_DISALLOW_COPY_AND_ASSIGN(lock_ptr); | ||
| std::shared_ptr<Data> strong_ptr_; | ||
| std::unique_lock<std::mutex> lock_; | ||
| }; | ||
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| weak_ptr GetWeakPtr() const { return weak_ptr(data_); } | ||
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| private: | ||
| FML_DISALLOW_COPY_AND_ASSIGN(threadsafe_unique_ptr); | ||
| std::shared_ptr<Data> data_; | ||
| // Clients that own the threadsafe_unique_ptr can access the pointer directly | ||
| // since there is no risk that it will be deleted whilst being accessed. | ||
| T* fast_ptr_; | ||
| }; | ||
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| } // namespace fml | ||
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| #endif // FLUTTER_FML_THREADSAFE_UNIQUE_PTR_H_ |
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