mapping_table.h revision a02191e04bc25c4935f804f2c080ae28663d096d 
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 Core;
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(Core*);
28}
29
30// This class provides the (global) table of memory mappings (owned by |Core|),
31// which maps mapping base addresses to |RawSharedBuffer::Mapping|s.
32//
33// This class is NOT thread-safe; locking is left to |Core|.
34class MOJO_SYSTEM_IMPL_EXPORT MappingTable {
35 public:
36  MappingTable();
37  ~MappingTable();
38
39  // Tries to add a mapping. (Takes ownership of the mapping in all cases; on
40  // failure, it will be destroyed.)
41  MojoResult AddMapping(scoped_ptr<RawSharedBufferMapping> mapping);
42  MojoResult RemoveMapping(void* address);
43
44 private:
45  friend bool internal::ShutdownCheckNoLeaks(Core*);
46
47  typedef base::hash_map<uintptr_t, RawSharedBufferMapping*>
48      AddressToMappingMap;
49  AddressToMappingMap address_to_mapping_map_;
50
51  DISALLOW_COPY_AND_ASSIGN(MappingTable);
52};
53
54}  // namespace system
55}  // namespace mojo
56
57#endif  // MOJO_SYSTEM_MAPPING_TABLE_H_
58