// Copyright 2018 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.

// Note:
//   1. This file is copied from
//      "src/platform2/media_perception/mojom/shared_memory.mojom" in the CrOS
//      repo.
//   2. On chromium, we must use the standard version, i.e.,
//      "mojo/public/mojom/base/shared_memory.mojom" in the chromium repo and
//      must not sync this file to chromium.

module mojo_base.mojom;

// Wraps a shared memory handle with additional type information to convey that
// the handle is only mappable to read-only memory.
[Stable]
struct ReadOnlySharedMemoryRegion {
  handle<shared_buffer> buffer;
};

// Wraps a shared memory handle with additional type information to convey that
// the handle is mappable to writable memory but can also be converted to
// a ReadOnlySharedMemoryRegion for sharing with other clients.
[Stable]
struct WritableSharedMemoryRegion {
  handle<shared_buffer> buffer;
};

// Wraps a shared memory handle with additional type information to convey that
// the handle is always mappable to writable memory by any client which obtains
// a handle duplicated from this one.
[Stable]
struct UnsafeSharedMemoryRegion {
  handle<shared_buffer> buffer;
};