src/ipcz/buffer_id.h

// 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.

#ifndef IPCZ_SRC_IPCZ_BUFFER_ID_H_
#define IPCZ_SRC_IPCZ_BUFFER_ID_H_

#include <cstdint>

#include "util/strong_alias.h"

namespace ipcz {

// Identifies a shared memory buffer scoped to a NodeLink and owned by its
// NodeLinkMemory via a BufferPool. New BufferIds are allocated atomically by
// either side of the NodeLink.
using BufferId = StrongAlias<class BufferIdTag, uint64_t>;

constexpr BufferId kInvalidBufferId{~0};

}  // namespace ipcz

#endif  // IPCZ_SRC_IPCZ_BUFFER_ID_H_