Mojo: Add a platform interface for shared memory (embedder::PlatformSharedBuffer).

mojo/system/dispatcher.h

 // Copyright 2013 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #ifndef MOJO_SYSTEM_DISPATCHER_H_
 #define MOJO_SYSTEM_DISPATCHER_H_
 
 #include <stddef.h>
 #include <stdint.h>
 
 #include <vector>
 
 #include "base/macros.h"
 #include "base/memory/ref_counted.h"
 #include "base/memory/scoped_ptr.h"
 #include "base/synchronization/lock.h"
 #include "mojo/embedder/platform_handle.h"
 #include "mojo/embedder/platform_handle_vector.h"
 #include "mojo/public/c/system/buffer.h"
 #include "mojo/public/c/system/data_pipe.h"
 #include "mojo/public/c/system/message_pipe.h"
 #include "mojo/public/c/system/types.h"
 #include "mojo/system/handle_signals_state.h"
 #include "mojo/system/memory.h"
 #include "mojo/system/system_impl_export.h"
 
 namespace mojo {
+
+namespace embedder {
+class PlatformSharedBufferMapping;
+}
+
 namespace system {
 
 class Channel;
 class Core;
 class Dispatcher;
 class DispatcherTransport;
 class HandleTable;
 class LocalMessagePipeEndpoint;
 class ProxyMessagePipeEndpoint;
-class RawSharedBufferMapping;
 class TransportData;
 class Waiter;
 
 typedef std::vector<scoped_refptr<Dispatcher> > DispatcherVector;
 
 namespace test {
 
 // Test helper. We need to declare it here so we can friend it.
 MOJO_SYSTEM_IMPL_EXPORT DispatcherTransport
     DispatcherTryStartTransport(Dispatcher* dispatcher);
@@ skipping 58 matching lines @@
   MojoResult BeginReadData(UserPointer<const void*> buffer,
                            UserPointer<uint32_t> buffer_num_bytes,
                            MojoReadDataFlags flags);
   MojoResult EndReadData(uint32_t num_bytes_read);
   // |options| may be null. |new_dispatcher| must not be null, but
   // |*new_dispatcher| should be null (and will contain the dispatcher for the
   // new handle on success).
   MojoResult DuplicateBufferHandle(
       UserPointer<const MojoDuplicateBufferHandleOptions> options,
       scoped_refptr<Dispatcher>* new_dispatcher);
-  MojoResult MapBuffer(uint64_t offset,
-                       uint64_t num_bytes,
-                       MojoMapBufferFlags flags,
-                       scoped_ptr<RawSharedBufferMapping>* mapping);
+  MojoResult MapBuffer(
+      uint64_t offset,
+      uint64_t num_bytes,
+      MojoMapBufferFlags flags,
+      scoped_ptr<embedder::PlatformSharedBufferMapping>* mapping);
 
   // Gets the current handle signals state. (The default implementation simply
   // returns a default-constructed |HandleSignalsState|, i.e., no signals
   // satisfied or satisfiable.) Note: The state is subject to change from other
   // threads.
   HandleSignalsState GetHandleSignalsState() const;
 
   // Adds a waiter to this dispatcher. The waiter will be woken up when this
   // object changes state to satisfy |signals| with context |context|. It will
   // also be woken up when it becomes impossible for the object to ever satisfy
@@ skipping 123 matching lines @@
       UserPointer<uint32_t> buffer_num_bytes,
       MojoReadDataFlags flags);
   virtual MojoResult EndReadDataImplNoLock(uint32_t num_bytes_read);
   virtual MojoResult DuplicateBufferHandleImplNoLock(
       UserPointer<const MojoDuplicateBufferHandleOptions> options,
       scoped_refptr<Dispatcher>* new_dispatcher);
   virtual MojoResult MapBufferImplNoLock(
       uint64_t offset,
       uint64_t num_bytes,
       MojoMapBufferFlags flags,
-      scoped_ptr<RawSharedBufferMapping>* mapping);
+      scoped_ptr<embedder::PlatformSharedBufferMapping>* mapping);
   virtual HandleSignalsState GetHandleSignalsStateImplNoLock() const;
   virtual MojoResult AddWaiterImplNoLock(Waiter* waiter,
                                          MojoHandleSignals signals,
                                          uint32_t context,
                                          HandleSignalsState* signals_state);
   virtual void RemoveWaiterImplNoLock(Waiter* waiter,
                                       HandleSignalsState* signals_state);
 
   // These implement the API used to serialize dispatchers to a |Channel|
   // (described below). They will only be called on a dispatcher that's attached
@@ skipping 117 matching lines @@
 
   Dispatcher* dispatcher_;
 
   // Copy and assign allowed.
 };
 
 }  // namespace system
 }  // namespace mojo
 
 #endif  // MOJO_SYSTEM_DISPATCHER_H_