base/memory/ref_counted.cc

   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
   7 #include "base/logging.h"
   8 #include "base/threading/thread_collision_warner.h"
   9
  10 namespace base {
  11
  12 namespace subtle {
  13
  14 RefCountedBase::RefCountedBase()
  15     : ref_count_(0)
  16 #ifndef NDEBUG
  17     , in_dtor_(false)
  18 #endif
  19     {
  20 }
  21
  22 RefCountedBase::~RefCountedBase() {
  23 #ifndef NDEBUG
  24   DCHECK(in_dtor_) << "RefCounted object deleted without calling Release()";
  25 #endif
  26 }
  27
  28 void RefCountedBase::AddRef() const {
  29   // TODO(maruel): Add back once it doesn't assert 500 times/sec.
  30   // Current thread books the critical section "AddRelease" without release it.
  31   // DFAKE_SCOPED_LOCK_THREAD_LOCKED(add_release_);
  32 #ifndef NDEBUG
  33   DCHECK(!in_dtor_);
  34 #endif
  35   ++ref_count_;
  36 }
  37
  38 bool RefCountedBase::Release() const {
  39   // TODO(maruel): Add back once it doesn't assert 500 times/sec.
  40   // Current thread books the critical section "AddRelease" without release it.
  41   // DFAKE_SCOPED_LOCK_THREAD_LOCKED(add_release_);
  42 #ifndef NDEBUG
  43   DCHECK(!in_dtor_);
  44 #endif
  45   if (--ref_count_ == 0) {
  46 #ifndef NDEBUG
  47     in_dtor_ = true;
  48 #endif
  49     return true;
  50   }
  51   return false;
  52 }
  53
  54 bool RefCountedThreadSafeBase::HasOneRef() const {
  55   return AtomicRefCountIsOne(
  56       &const_cast<RefCountedThreadSafeBase*>(this)->ref_count_);
  57 }
  58
  59 RefCountedThreadSafeBase::RefCountedThreadSafeBase() : ref_count_(0) {
  60 #ifndef NDEBUG
  61   in_dtor_ = false;
  62 #endif
  63 }
  64
  65 RefCountedThreadSafeBase::~RefCountedThreadSafeBase() {
  66 #ifndef NDEBUG
  67   DCHECK(in_dtor_) << "RefCountedThreadSafe object deleted without "
  68                       "calling Release()";
  69 #endif
  70 }
  71
  72 void RefCountedThreadSafeBase::AddRef() const {
  73 #ifndef NDEBUG
  74   DCHECK(!in_dtor_);
  75 #endif
  76   AtomicRefCountInc(&ref_count_);
  77 }
  78
  79 bool RefCountedThreadSafeBase::Release() const {
  80 #ifndef NDEBUG
  81   DCHECK(!in_dtor_);
  82   DCHECK(!AtomicRefCountIsZero(&ref_count_));
  83 #endif
  84   if (!AtomicRefCountDec(&ref_count_)) {
  85 #ifndef NDEBUG
  86     in_dtor_ = true;
  87 #endif
  88     return true;
  89   }
  90   return false;
  91 }
  92
  93 }  // namespace subtle
  94
  95 }  // namespace base