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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/ref_counted.h"
6 #include "base/threading/thread_collision_warner.h"
7 
8 namespace base {
9 
10 namespace subtle {
11 
HasOneRef() const12 bool RefCountedThreadSafeBase::HasOneRef() const {
13   return AtomicRefCountIsOne(
14       &const_cast<RefCountedThreadSafeBase*>(this)->ref_count_);
15 }
16 
RefCountedThreadSafeBase()17 RefCountedThreadSafeBase::RefCountedThreadSafeBase() : ref_count_(0) {
18 #ifndef NDEBUG
19   in_dtor_ = false;
20 #endif
21 }
22 
~RefCountedThreadSafeBase()23 RefCountedThreadSafeBase::~RefCountedThreadSafeBase() {
24 #ifndef NDEBUG
25   DCHECK(in_dtor_) << "RefCountedThreadSafe object deleted without "
26                       "calling Release()";
27 #endif
28 }
29 
AddRef() const30 void RefCountedThreadSafeBase::AddRef() const {
31 #ifndef NDEBUG
32   DCHECK(!in_dtor_);
33 #endif
34   AtomicRefCountInc(&ref_count_);
35 }
36 
Release() const37 bool RefCountedThreadSafeBase::Release() const {
38 #ifndef NDEBUG
39   DCHECK(!in_dtor_);
40   DCHECK(!AtomicRefCountIsZero(&ref_count_));
41 #endif
42   if (!AtomicRefCountDec(&ref_count_)) {
43 #ifndef NDEBUG
44     in_dtor_ = true;
45 #endif
46     return true;
47   }
48   return false;
49 }
50 
51 }  // namespace subtle
52 
53 }  // namespace base
54