mapping_table.h revision e5d81f57cb97b3b6b7fccc9c5610d21eb81db09d 
1// Copyright 2014 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
5#ifndef MOJO_SYSTEM_MAPPING_TABLE_H_
6#define MOJO_SYSTEM_MAPPING_TABLE_H_
7
8#include <stdint.h>
9
10#include <vector>
11
12#include "base/containers/hash_tables.h"
13#include "base/macros.h"
14#include "base/memory/scoped_ptr.h"
15#include "mojo/public/c/system/core.h"
16#include "mojo/system/system_impl_export.h"
17
18namespace mojo {
19namespace system {
20
21class CoreImpl;
22class RawSharedBufferMapping;
23
24// Test-only function (defined/used in embedder/test_embedder.cc). Declared here
25// so it can be friended.
26namespace internal {
27bool ShutdownCheckNoLeaks(CoreImpl*);
28}
29
30// This class provides the (global) table of memory mappings (owned by
31// |CoreImpl|), which maps mapping base addresses to
32// |RawSharedBuffer::Mapping|s.
33//
34// This class is NOT thread-safe; locking is left to |CoreImpl|.
35class MOJO_SYSTEM_IMPL_EXPORT MappingTable {
36 public:
37  MappingTable();
38  ~MappingTable();
39
40  // Tries to add a mapping. (Takes ownership of the mapping in all cases; on
41  // failure, it will be destroyed.)
42  MojoResult AddMapping(scoped_ptr<RawSharedBufferMapping> mapping);
43  MojoResult RemoveMapping(void* address);
44
45 private:
46  friend bool internal::ShutdownCheckNoLeaks(CoreImpl*);
47
48  typedef base::hash_map<uintptr_t, RawSharedBufferMapping*>
49      AddressToMappingMap;
50  AddressToMappingMap address_to_mapping_map_;
51
52  DISALLOW_COPY_AND_ASSIGN(MappingTable);
53};
54
55}  // namespace system
56}  // namespace mojo
57
58#endif  // MOJO_SYSTEM_MAPPING_TABLE_H_
59