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-rw-r--r--base/memory/ref_counted.cc95
1 files changed, 95 insertions, 0 deletions
diff --git a/base/memory/ref_counted.cc b/base/memory/ref_counted.cc
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+++ 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