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// Copyright 2022 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 <atomic>
#include "ipcz/ipcz.h"
#include "util/ref_counted.h"
namespace ipcz {
// A RefCountedFragment is an object allocated within a shared Fragment from
// NodeLinkMemory, and which is automatially freed when its last reference is
// released. Consumers can hold onto references to RefCountedFragment objects
// by holding a FragmentRef.
struct IPCZ_ALIGN(4) RefCountedFragment {
enum { kAdoptExistingRef };
enum { kUnmanagedRef };
int32_t ref_count_for_testing() const { return ref_count_; }
// Increments the reference count for this object.
void AddRef();
// Releases a reference and returns the previous reference count. If this
// returns 1, the underlying Fragment can be safely freed.
int32_t ReleaseRef();
std::atomic<int32_t> ref_count_{1};
} // namespace ipcz