1// Copyright 2018 The Chromium Authors. All rights reserved.
2// Use of this source code is governed by a BSD-style license that can be
3// found in the LICENSE file.
4
5module mojo_base.mojom;
6
7// Wraps a shared memory handle with additional type information to convey that
8// the handle is only mappable to read-only memory.
9struct ReadOnlySharedMemoryRegion {
10  handle<shared_buffer> buffer;
11};
12
13// Wraps a shared memory handle with additional type information to convey that
14// the handle is mappable to writable memory but can also be converted to
15// a ReadOnlySharedMemoryRegion for sharing with other clients.
16struct WritableSharedMemoryRegion {
17  handle<shared_buffer> buffer;
18};
19
20// Wraps a shared memory handle with additional type information to convey that
21// the handle is always mappable to writable memory by any client which obtains
22// a handle duplicated from this one.
23struct UnsafeSharedMemoryRegion {
24  handle<shared_buffer> buffer;
25};
26