mojo/system/mapping_table.h

   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/types.h"
  16 #include "mojo/system/system_impl_export.h"
  17
  18 namespace mojo {
  19 namespace system {
  20
  21 class Core;
  22 class RawSharedBufferMapping;
  23
  24 // Test-only function (defined/used in embedder/test_embedder.cc). Declared here
  25 // so it can be friended.
  26 namespace internal {
  27 bool 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|.
  34 class 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_