Add a Mojo EDK for Chrome that uses one OS pipe per message pipe.

mojo/edk/system/shared_buffer_dispatcher.h

 // Copyright 2014 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_EDK_SYSTEM_SHARED_BUFFER_DISPATCHER_H_
 #define MOJO_EDK_SYSTEM_SHARED_BUFFER_DISPATCHER_H_
 
 #include "mojo/edk/embedder/platform_shared_buffer.h"
 #include "mojo/edk/system/memory.h"
 #include "mojo/edk/system/simple_dispatcher.h"
 #include "mojo/edk/system/system_impl_export.h"
 #include "mojo/public/cpp/system/macros.h"
 
 namespace mojo {
 
-namespace embedder {
+namespace edk {
 class PlatformSupport;
-}
-
-namespace system {
 
 // TODO(vtl): We derive from SimpleDispatcher, even though we don't currently
 // have anything that's waitable. I want to add a "transferrable" wait flag
 // (which would entail overriding |GetHandleSignalsStateImplNoLock()|, etc.).
 class MOJO_SYSTEM_IMPL_EXPORT SharedBufferDispatcher final
     : public SimpleDispatcher {
  public:
   // The default options to use for |MojoCreateSharedBuffer()|. (Real uses
   // should obtain this via |ValidateCreateOptions()| with a null |in_options|;
   // this is exposed directly for testing convenience.)
   static const MojoCreateSharedBufferOptions kDefaultCreateOptions;
 
   // Validates and/or sets default options for |MojoCreateSharedBufferOptions|.
   // If non-null, |in_options| must point to a struct of at least
   // |in_options->struct_size| bytes. |out_options| must point to a (current)
   // |MojoCreateSharedBufferOptions| and will be entirely overwritten on success
   // (it may be partly overwritten on failure).
   static MojoResult ValidateCreateOptions(
       UserPointer<const MojoCreateSharedBufferOptions> in_options,
       MojoCreateSharedBufferOptions* out_options);
 
   // Static factory method: |validated_options| must be validated (obviously).
   // On failure, |*result| will be left as-is.
   // TODO(vtl): This should probably be made to return a scoped_refptr and have
   // a MojoResult out parameter instead.
   static MojoResult Create(
-      embedder::PlatformSupport* platform_support,
+      PlatformSupport* platform_support,
       const MojoCreateSharedBufferOptions& validated_options,
       uint64_t num_bytes,
       scoped_refptr<SharedBufferDispatcher>* result);
 
   // |Dispatcher| public methods:
   Type GetType() const override;
 
   // The "opposite" of |SerializeAndClose()|. (Typically this is called by
   // |Dispatcher::Deserialize()|.)
   static scoped_refptr<SharedBufferDispatcher> Deserialize(
-      Channel* channel,
       const void* source,
       size_t size,
-      embedder::PlatformHandleVector* platform_handles);
+      PlatformHandleVector* platform_handles);
 
  private:
   static scoped_refptr<SharedBufferDispatcher> CreateInternal(
-      scoped_refptr<embedder::PlatformSharedBuffer> shared_buffer) {
+      scoped_refptr<PlatformSharedBuffer> shared_buffer) {
     return make_scoped_refptr(new SharedBufferDispatcher(shared_buffer.Pass()));
   }
 
   explicit SharedBufferDispatcher(
-      scoped_refptr<embedder::PlatformSharedBuffer> shared_buffer);
+      scoped_refptr<PlatformSharedBuffer> shared_buffer);
   ~SharedBufferDispatcher() override;
 
   // Validates and/or sets default options for
   // |MojoDuplicateBufferHandleOptions|. If non-null, |in_options| must point to
   // a struct of at least |in_options->struct_size| bytes. |out_options| must
   // point to a (current) |MojoDuplicateBufferHandleOptions| and will be
   // entirely overwritten on success (it may be partly overwritten on failure).
   static MojoResult ValidateDuplicateOptions(
       UserPointer<const MojoDuplicateBufferHandleOptions> in_options,
       MojoDuplicateBufferHandleOptions* out_options);
 
   // |Dispatcher| protected methods:
   void CloseImplNoLock() override;
   scoped_refptr<Dispatcher> CreateEquivalentDispatcherAndCloseImplNoLock()
       override;
   MojoResult DuplicateBufferHandleImplNoLock(
       UserPointer<const MojoDuplicateBufferHandleOptions> options,
       scoped_refptr<Dispatcher>* new_dispatcher) override;
   MojoResult MapBufferImplNoLock(
       uint64_t offset,
       uint64_t num_bytes,
       MojoMapBufferFlags flags,
-      scoped_ptr<embedder::PlatformSharedBufferMapping>* mapping) override;
-  void StartSerializeImplNoLock(Channel* channel,
-                                size_t* max_size,
-                                size_t* max_platform_handles) override
-      MOJO_NOT_THREAD_SAFE;
+      scoped_ptr<PlatformSharedBufferMapping>* mapping) override;
+  void StartSerializeImplNoLock(size_t* max_size,
+                                size_t* max_platform_handles) override;
   bool EndSerializeAndCloseImplNoLock(
-      Channel* channel,
       void* destination,
       size_t* actual_size,
-      embedder::PlatformHandleVector* platform_handles) override
-      MOJO_NOT_THREAD_SAFE;
+      PlatformHandleVector* platform_handles) override;
 
-  scoped_refptr<embedder::PlatformSharedBuffer> shared_buffer_
-      MOJO_GUARDED_BY(mutex());
+  scoped_refptr<PlatformSharedBuffer> shared_buffer_;
 
   MOJO_DISALLOW_COPY_AND_ASSIGN(SharedBufferDispatcher);
 };
 
-}  // namespace system
+}  // namespace edk
 }  // namespace mojo
 
 #endif  // MOJO_EDK_SYSTEM_SHARED_BUFFER_DISPATCHER_H_