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245 lines
7.1 KiB
245 lines
7.1 KiB
/* |
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* Copyright (C) 2005 The Android Open Source Project |
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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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* http://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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*/ |
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#ifndef ANDROID_STRONG_POINTER_H |
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#define ANDROID_STRONG_POINTER_H |
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// --------------------------------------------------------------------------- |
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namespace android { |
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template<typename T> class wp; |
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// --------------------------------------------------------------------------- |
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#define COMPARE(_op_) \ |
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inline bool operator _op_ (const sp<T>& o) const { \ |
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return m_ptr _op_ o.m_ptr; \ |
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} \ |
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inline bool operator _op_ (const T* o) const { \ |
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return m_ptr _op_ o; \ |
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} \ |
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template<typename U> \ |
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inline bool operator _op_ (const sp<U>& o) const { \ |
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return m_ptr _op_ o.m_ptr; \ |
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} \ |
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template<typename U> \ |
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inline bool operator _op_ (const U* o) const { \ |
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return m_ptr _op_ o; \ |
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} \ |
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inline bool operator _op_ (const wp<T>& o) const { \ |
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return m_ptr _op_ o.m_ptr; \ |
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} \ |
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template<typename U> \ |
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inline bool operator _op_ (const wp<U>& o) const { \ |
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return m_ptr _op_ o.m_ptr; \ |
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} |
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// --------------------------------------------------------------------------- |
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template<typename T> |
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class sp { |
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public: |
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inline sp() : m_ptr(0) { } |
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sp(T* other); // NOLINT(implicit) |
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sp(const sp<T>& other); |
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sp(sp<T>&& other); |
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template<typename U> sp(U* other); // NOLINT(implicit) |
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template<typename U> sp(const sp<U>& other); // NOLINT(implicit) |
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template<typename U> sp(sp<U>&& other); // NOLINT(implicit) |
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~sp(); |
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// Assignment |
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sp& operator = (T* other); |
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sp& operator = (const sp<T>& other); |
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sp& operator = (sp<T>&& other); |
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template<typename U> sp& operator = (const sp<U>& other); |
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template<typename U> sp& operator = (sp<U>&& other); |
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template<typename U> sp& operator = (U* other); |
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//! Special optimization for use by ProcessState (and nobody else). |
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void force_set(T* other); |
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// Reset |
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void clear(); |
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// Accessors |
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inline T& operator* () const { return *m_ptr; } |
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inline T* operator-> () const { return m_ptr; } |
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inline T* get() const { return m_ptr; } |
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// Operators |
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COMPARE(==) |
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COMPARE(!=) |
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COMPARE(>) |
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COMPARE(<) |
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COMPARE(<=) |
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COMPARE(>=) |
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private: |
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template<typename Y> friend class sp; |
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template<typename Y> friend class wp; |
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void set_pointer(T* ptr); |
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T* m_ptr; |
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}; |
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// For code size reasons, we do not want this inlined or templated. |
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void sp_report_race(); |
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#undef COMPARE |
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// --------------------------------------------------------------------------- |
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// No user serviceable parts below here. |
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template<typename T> |
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sp<T>::sp(T* other) |
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: m_ptr(other) { |
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if (other) |
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other->incStrong(this); |
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} |
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template<typename T> |
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sp<T>::sp(const sp<T>& other) |
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: m_ptr(other.m_ptr) { |
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if (m_ptr) |
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m_ptr->incStrong(this); |
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} |
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template<typename T> |
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sp<T>::sp(sp<T>&& other) |
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: m_ptr(other.m_ptr) { |
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other.m_ptr = nullptr; |
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} |
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template<typename T> template<typename U> |
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sp<T>::sp(U* other) |
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: m_ptr(other) { |
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if (other) |
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(static_cast<T*>(other))->incStrong(this); |
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} |
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template<typename T> template<typename U> |
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sp<T>::sp(const sp<U>& other) |
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: m_ptr(other.m_ptr) { |
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if (m_ptr) |
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m_ptr->incStrong(this); |
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} |
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template<typename T> template<typename U> |
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sp<T>::sp(sp<U>&& other) |
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: m_ptr(other.m_ptr) { |
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other.m_ptr = nullptr; |
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} |
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template<typename T> |
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sp<T>::~sp() { |
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if (m_ptr) |
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m_ptr->decStrong(this); |
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} |
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template<typename T> |
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sp<T>& sp<T>::operator =(const sp<T>& other) { |
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// Force m_ptr to be read twice, to heuristically check for data races. |
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T* oldPtr(*const_cast<T* volatile*>(&m_ptr)); |
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T* otherPtr(other.m_ptr); |
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if (otherPtr) otherPtr->incStrong(this); |
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if (oldPtr) oldPtr->decStrong(this); |
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if (oldPtr != *const_cast<T* volatile*>(&m_ptr)) sp_report_race(); |
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m_ptr = otherPtr; |
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return *this; |
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} |
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template<typename T> |
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sp<T>& sp<T>::operator =(sp<T>&& other) { |
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T* oldPtr(*const_cast<T* volatile*>(&m_ptr)); |
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if (oldPtr) oldPtr->decStrong(this); |
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if (oldPtr != *const_cast<T* volatile*>(&m_ptr)) sp_report_race(); |
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m_ptr = other.m_ptr; |
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other.m_ptr = nullptr; |
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return *this; |
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} |
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template<typename T> |
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sp<T>& sp<T>::operator =(T* other) { |
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T* oldPtr(*const_cast<T* volatile*>(&m_ptr)); |
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if (other) other->incStrong(this); |
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if (oldPtr) oldPtr->decStrong(this); |
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if (oldPtr != *const_cast<T* volatile*>(&m_ptr)) sp_report_race(); |
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m_ptr = other; |
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return *this; |
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} |
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template<typename T> template<typename U> |
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sp<T>& sp<T>::operator =(const sp<U>& other) { |
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T* oldPtr(*const_cast<T* volatile*>(&m_ptr)); |
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T* otherPtr(other.m_ptr); |
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if (otherPtr) otherPtr->incStrong(this); |
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if (oldPtr) oldPtr->decStrong(this); |
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if (oldPtr != *const_cast<T* volatile*>(&m_ptr)) sp_report_race(); |
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m_ptr = otherPtr; |
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return *this; |
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} |
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template<typename T> template<typename U> |
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sp<T>& sp<T>::operator =(sp<U>&& other) { |
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T* oldPtr(*const_cast<T* volatile*>(&m_ptr)); |
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if (m_ptr) m_ptr->decStrong(this); |
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if (oldPtr != *const_cast<T* volatile*>(&m_ptr)) sp_report_race(); |
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m_ptr = other.m_ptr; |
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other.m_ptr = nullptr; |
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return *this; |
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} |
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template<typename T> template<typename U> |
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sp<T>& sp<T>::operator =(U* other) { |
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T* oldPtr(*const_cast<T* volatile*>(&m_ptr)); |
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if (other) (static_cast<T*>(other))->incStrong(this); |
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if (oldPtr) oldPtr->decStrong(this); |
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if (oldPtr != *const_cast<T* volatile*>(&m_ptr)) sp_report_race(); |
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m_ptr = other; |
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return *this; |
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} |
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template<typename T> |
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void sp<T>::force_set(T* other) { |
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other->forceIncStrong(this); |
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m_ptr = other; |
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} |
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template<typename T> |
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void sp<T>::clear() { |
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if (m_ptr) { |
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m_ptr->decStrong(this); |
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m_ptr = 0; |
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} |
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} |
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template<typename T> |
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void sp<T>::set_pointer(T* ptr) { |
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m_ptr = ptr; |
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} |
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}; // namespace android |
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// --------------------------------------------------------------------------- |
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#endif // ANDROID_STRONG_POINTER_H
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