2fa3693c26
The bulk merge from -bayo to klp-dev should not have been merged to master. Change-Id: I527a03a76f5247e4939a672f27c314dc11cbb854
81 lines
2.7 KiB
C++
81 lines
2.7 KiB
C++
/*
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* Copyright (C) 2013, 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 LATINIME_EXCLUSIVE_OWNERSHIP_POINTER_H
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#define LATINIME_EXCLUSIVE_OWNERSHIP_POINTER_H
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#include "defines.h"
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namespace latinime {
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template<class T>
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class ExclusiveOwnershipPointer {
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public:
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// This instance become an owner of the raw pointer.
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AK_FORCE_INLINE ExclusiveOwnershipPointer(T *const rawPointer)
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: mPointer(rawPointer),
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mSharedOwnerPtr(new (ExclusiveOwnershipPointer<T> *)(this)) {}
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// Move the ownership.
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AK_FORCE_INLINE ExclusiveOwnershipPointer(const ExclusiveOwnershipPointer<T> &pointer)
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: mPointer(pointer.mPointer), mSharedOwnerPtr(pointer.mSharedOwnerPtr) {
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transferOwnership(&pointer);
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}
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AK_FORCE_INLINE ~ExclusiveOwnershipPointer() {
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deletePointersIfHavingOwnership();
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}
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AK_FORCE_INLINE T *get() const {
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return mPointer;
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}
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private:
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// This class allows to copy and ensures only one instance has the ownership of the
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// managed pointer.
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DISALLOW_DEFAULT_CONSTRUCTOR(ExclusiveOwnershipPointer);
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DISALLOW_ASSIGNMENT_OPERATOR(ExclusiveOwnershipPointer);
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void transferOwnership(const ExclusiveOwnershipPointer<T> *const src) {
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if (*mSharedOwnerPtr != src) {
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AKLOGE("Failed to transfer the ownership because src is not the current owner."
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"src: %p, owner: %p", src, *mSharedOwnerPtr);
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ASSERT(false);
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return;
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}
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// Transfer the ownership from src to this instance.
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*mSharedOwnerPtr = this;
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}
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void deletePointersIfHavingOwnership() {
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if (mSharedOwnerPtr && *mSharedOwnerPtr == this) {
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if (mPointer) {
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if (DEBUG_DICT) {
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AKLOGI("Releasing pointer: %p", mPointer);
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}
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delete mPointer;
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}
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delete mSharedOwnerPtr;
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}
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}
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T *mPointer;
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// mSharedOwnerPtr points a shared memory space where the instance which has the ownership is
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// stored.
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ExclusiveOwnershipPointer<T> **mSharedOwnerPtr;
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};
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} // namespace latinime
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#endif /* LATINIME_EXCLUSIVE_OWNERSHIP_POINTER_H */
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