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| 1 // Copyright (c) 2011 The Chromium Authors. All rights reserved. | |
| 2 // Use of this source code is governed by a BSD-style license that can be | |
| 3 // found in the LICENSE file. | |
| 4 | |
| 5 #include "base/memory/weak_ptr.h" | |
| 6 | |
| 7 namespace base { | |
| 8 namespace internal { | |
| 9 | |
| 10 WeakReference::Flag::Flag() : is_valid_(true) { | |
| 11 // Flags only become bound when checked for validity, or invalidated, | |
| 12 // so that we can check that later validity/invalidation operations on | |
| 13 // the same Flag take place on the same sequenced thread. | |
| 14 sequence_checker_.DetachFromSequence(); | |
| 15 } | |
| 16 | |
| 17 void WeakReference::Flag::Invalidate() { | |
| 18 // The flag being invalidated with a single ref implies that there are no | |
| 19 // weak pointers in existence. Allow deletion on other thread in this case. | |
| 20 DCHECK(sequence_checker_.CalledOnValidSequencedThread() || HasOneRef()) | |
| 21 << "WeakPtrs must be invalidated on the same sequenced thread."; | |
| 22 is_valid_ = false; | |
| 23 } | |
| 24 | |
| 25 bool WeakReference::Flag::IsValid() const { | |
| 26 DCHECK(sequence_checker_.CalledOnValidSequencedThread()) | |
| 27 << "WeakPtrs must be checked on the same sequenced thread."; | |
| 28 return is_valid_; | |
| 29 } | |
| 30 | |
| 31 WeakReference::Flag::~Flag() { | |
| 32 } | |
| 33 | |
| 34 WeakReference::WeakReference() { | |
| 35 } | |
| 36 | |
| 37 WeakReference::WeakReference(const Flag* flag) : flag_(flag) { | |
| 38 } | |
| 39 | |
| 40 WeakReference::~WeakReference() { | |
| 41 } | |
| 42 | |
| 43 bool WeakReference::is_valid() const { return flag_.get() && flag_->IsValid(); } | |
| 44 | |
| 45 WeakReferenceOwner::WeakReferenceOwner() { | |
| 46 } | |
| 47 | |
| 48 WeakReferenceOwner::~WeakReferenceOwner() { | |
| 49 Invalidate(); | |
| 50 } | |
| 51 | |
| 52 WeakReference WeakReferenceOwner::GetRef() const { | |
| 53 // If we hold the last reference to the Flag then create a new one. | |
| 54 if (!HasRefs()) | |
| 55 flag_ = new WeakReference::Flag(); | |
| 56 | |
| 57 return WeakReference(flag_.get()); | |
| 58 } | |
| 59 | |
| 60 void WeakReferenceOwner::Invalidate() { | |
| 61 if (flag_.get()) { | |
| 62 flag_->Invalidate(); | |
| 63 flag_ = NULL; | |
| 64 } | |
| 65 } | |
| 66 | |
| 67 WeakPtrBase::WeakPtrBase() { | |
| 68 } | |
| 69 | |
| 70 WeakPtrBase::~WeakPtrBase() { | |
| 71 } | |
| 72 | |
| 73 WeakPtrBase::WeakPtrBase(const WeakReference& ref) : ref_(ref) { | |
| 74 } | |
| 75 | |
| 76 } // namespace internal | |
| 77 } // namespace base | |
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