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comparison: gfx/layers/AtomicRefCountedWithFinalize.h
gfx/layers/AtomicRefCountedWithFinalize.h
- branch
- TOR_BUG_9701
- changeset 8
- 97036ab72558
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| -1:000000000000 | 0:1543d94f1dc5 |
|---|---|
| 1 /* -*- Mode: C++; tab-width: 20; indent-tabs-mode: nil; c-basic-offset: 2 -*- | |
| 2 * This Source Code Form is subject to the terms of the Mozilla Public | |
| 3 * License, v. 2.0. If a copy of the MPL was not distributed with this | |
| 4 * file, You can obtain one at http://mozilla.org/MPL/2.0/. */ | |
| 5 | |
| 6 #ifndef MOZILLA_ATOMICREFCOUNTEDWITHFINALIZE_H_ | |
| 7 #define MOZILLA_ATOMICREFCOUNTEDWITHFINALIZE_H_ | |
| 8 | |
| 9 #include "mozilla/RefPtr.h" | |
| 10 #include "mozilla/NullPtr.h" | |
| 11 | |
| 12 namespace mozilla { | |
| 13 | |
| 14 template<typename T> | |
| 15 class AtomicRefCountedWithFinalize | |
| 16 { | |
| 17 protected: | |
| 18 AtomicRefCountedWithFinalize() | |
| 19 : mRecycleCallback(nullptr) | |
| 20 , mRefCount(0) | |
| 21 {} | |
| 22 | |
| 23 ~AtomicRefCountedWithFinalize() {} | |
| 24 | |
| 25 public: | |
| 26 void AddRef() { | |
| 27 MOZ_ASSERT(mRefCount >= 0); | |
| 28 ++mRefCount; | |
| 29 } | |
| 30 | |
| 31 void Release() { | |
| 32 MOZ_ASSERT(mRefCount > 0); | |
| 33 // Read mRecycleCallback early so that it does not get set to | |
| 34 // deleted memory, if the object is goes away. | |
| 35 RecycleCallback recycleCallback = mRecycleCallback; | |
| 36 int currCount = --mRefCount; | |
| 37 if (0 == currCount) { | |
| 38 // Recycle listeners must call ClearRecycleCallback | |
| 39 // before releasing their strong reference. | |
| 40 MOZ_ASSERT(mRecycleCallback == nullptr); | |
| 41 #ifdef DEBUG | |
| 42 mRefCount = detail::DEAD; | |
| 43 #endif | |
| 44 T* derived = static_cast<T*>(this); | |
| 45 derived->Finalize(); | |
| 46 delete derived; | |
| 47 } else if (1 == currCount && recycleCallback) { | |
| 48 T* derived = static_cast<T*>(this); | |
| 49 recycleCallback(derived, mClosure); | |
| 50 } | |
| 51 } | |
| 52 | |
| 53 typedef void (*RecycleCallback)(T* aObject, void* aClosure); | |
| 54 /** | |
| 55 * Set a callback responsible for recycling this object | |
| 56 * before it is finalized. | |
| 57 */ | |
| 58 void SetRecycleCallback(RecycleCallback aCallback, void* aClosure) | |
| 59 { | |
| 60 mRecycleCallback = aCallback; | |
| 61 mClosure = aClosure; | |
| 62 } | |
| 63 void ClearRecycleCallback() { SetRecycleCallback(nullptr, nullptr); } | |
| 64 | |
| 65 private: | |
| 66 RecycleCallback mRecycleCallback; | |
| 67 void *mClosure; | |
| 68 Atomic<int> mRefCount; | |
| 69 }; | |
| 70 | |
| 71 } | |
| 72 | |
| 73 #endif |
