mojo/edk/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_EDK_SYSTEM_MAPPING_TABLE_H_
   6 #define MOJO_EDK_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/edk/system/system_impl_export.h"
  16 #include "mojo/public/c/system/types.h"
  17
  18 namespace mojo {
  19
  20 namespace embedder {
  21 class PlatformSharedBufferMapping;
  22 }
  23
  24 namespace system {
  25
  26 class Core;
  27
  28 // Test-only function (defined/used in embedder/test_embedder.cc). Declared here
  29 // so it can be friended.
  30 namespace internal {
  31 bool ShutdownCheckNoLeaks(Core*);
  32 }
  33
  34 // This class provides the (global) table of memory mappings (owned by |Core|),
  35 // which maps mapping base addresses to |PlatformSharedBufferMapping|s.
  36 //
  37 // This class is NOT thread-safe; locking is left to |Core|.
  38 class MOJO_SYSTEM_IMPL_EXPORT MappingTable {
  39  public:
  40   MappingTable();
  41   ~MappingTable();
  42
  43   // Tries to add a mapping. (Takes ownership of the mapping in all cases; on
  44   // failure, it will be destroyed.)
  45   MojoResult AddMapping(
  46       scoped_ptr<embedder::PlatformSharedBufferMapping> mapping);
  47   MojoResult RemoveMapping(uintptr_t address);
  48
  49  private:
  50   friend bool internal::ShutdownCheckNoLeaks(Core*);
  51
  52   typedef base::hash_map<uintptr_t, embedder::PlatformSharedBufferMapping*>
  53       AddressToMappingMap;
  54   AddressToMappingMap address_to_mapping_map_;
  55
  56   DISALLOW_COPY_AND_ASSIGN(MappingTable);
  57 };
  58
  59 }  // namespace system
  60 }  // namespace mojo
  61
  62 #endif  // MOJO_EDK_SYSTEM_MAPPING_TABLE_H_