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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 
     12 bool RefCountedThreadSafeBase::HasOneRef() const {
     13   return AtomicRefCountIsOne(
     14       &const_cast<RefCountedThreadSafeBase*>(this)->ref_count_);
     15 }
     16 
     17 RefCountedThreadSafeBase::RefCountedThreadSafeBase() : ref_count_(0) {
     18 #ifndef NDEBUG
     19   in_dtor_ = false;
     20 #endif
     21 }
     22 
     23 RefCountedThreadSafeBase::~RefCountedThreadSafeBase() {
     24 #ifndef NDEBUG
     25   DCHECK(in_dtor_) << "RefCountedThreadSafe object deleted without "
     26                       "calling Release()";
     27 #endif
     28 }
     29 
     30 void RefCountedThreadSafeBase::AddRef() const {
     31 #ifndef NDEBUG
     32   DCHECK(!in_dtor_);
     33 #endif
     34   AtomicRefCountInc(&ref_count_);
     35 }
     36 
     37 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