1 files changed, 95 insertions, 0 deletions
diff --git a/base/memory/ref_counted.cc b/base/memory/ref_counted.cc
new file mode 100644
index 000000000000..31ad5098cd0f
--- /dev/null
+++ b/base/memory/ref_counted.cc
@@ -0,0 +1,95 @@
+// Copyright (c) 2011 The Chromium Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+#include "base/memory/ref_counted.h"
+
+#include "base/logging.h"
+#include "base/threading/thread_collision_warner.h"
+
+namespace base {
+
+namespace subtle {
+
+RefCountedBase::RefCountedBase()
+    : ref_count_(0)
+#ifndef NDEBUG
+    , in_dtor_(false)
+#endif
+    {
+}
+
+RefCountedBase::~RefCountedBase() {
+#ifndef NDEBUG
+  DCHECK(in_dtor_) << "RefCounted object deleted without calling Release()";
+#endif
+}
+
+void RefCountedBase::AddRef() const {
+  // TODO(maruel): Add back once it doesn't assert 500 times/sec.
+  // Current thread books the critical section "AddRelease" without release it.
+  // DFAKE_SCOPED_LOCK_THREAD_LOCKED(add_release_);
+#ifndef NDEBUG
+  DCHECK(!in_dtor_);
+#endif
+  ++ref_count_;
+}
+
+bool RefCountedBase::Release() const {
+  // TODO(maruel): Add back once it doesn't assert 500 times/sec.
+  // Current thread books the critical section "AddRelease" without release it.
+  // DFAKE_SCOPED_LOCK_THREAD_LOCKED(add_release_);
+#ifndef NDEBUG
+  DCHECK(!in_dtor_);
+#endif
+  if (--ref_count_ == 0) {
+#ifndef NDEBUG
+    in_dtor_ = true;
+#endif
+    return true;
+  }
+  return false;
+}
+
+bool RefCountedThreadSafeBase::HasOneRef() const {
+  return AtomicRefCountIsOne(
+      &const_cast<RefCountedThreadSafeBase*>(this)->ref_count_);
+}
+
+RefCountedThreadSafeBase::RefCountedThreadSafeBase() : ref_count_(0) {
+#ifndef NDEBUG
+  in_dtor_ = false;
+#endif
+}
+
+RefCountedThreadSafeBase::~RefCountedThreadSafeBase() {
+#ifndef NDEBUG
+  DCHECK(in_dtor_) << "RefCountedThreadSafe object deleted without "
+                      "calling Release()";
+#endif
+}
+
+void RefCountedThreadSafeBase::AddRef() const {
+#ifndef NDEBUG
+  DCHECK(!in_dtor_);
+#endif
+  AtomicRefCountInc(&ref_count_);
+}
+
+bool RefCountedThreadSafeBase::Release() const {
+#ifndef NDEBUG
+  DCHECK(!in_dtor_);
+  DCHECK(!AtomicRefCountIsZero(&ref_count_));
+#endif
+  if (!AtomicRefCountDec(&ref_count_)) {
+#ifndef NDEBUG
+    in_dtor_ = true;
+#endif
+    return true;
+  }
+  return false;
+}
+
+}  // namespace subtle
+
+}  // namespace base