Revert "Move mojo edk into mojo/edk"

mojo/edk/system/message_pipe_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_EDK_SYSTEM_MESSAGE_PIPE_DISPATCHER_H_
-#define MOJO_EDK_SYSTEM_MESSAGE_PIPE_DISPATCHER_H_
-
-#include "base/macros.h"
-#include "base/memory/ref_counted.h"
-#include "mojo/edk/system/dispatcher.h"
-#include "mojo/edk/system/memory.h"
-#include "mojo/edk/system/system_impl_export.h"
-
-namespace mojo {
-namespace system {
-
-class ChannelEndpoint;
-class MessagePipe;
-class MessagePipeDispatcherTransport;
-
-// This is the |Dispatcher| implementation for message pipes (created by the
-// Mojo primitive |MojoCreateMessagePipe()|). This class is thread-safe.
-class MOJO_SYSTEM_IMPL_EXPORT MessagePipeDispatcher : public Dispatcher {
- public:
-  // The default options to use for |MojoCreateMessagePipe()|. (Real uses
-  // should obtain this via |ValidateCreateOptions()| with a null |in_options|;
-  // this is exposed directly for testing convenience.)
-  static const MojoCreateMessagePipeOptions kDefaultCreateOptions;
-
-  MessagePipeDispatcher(
-      const MojoCreateMessagePipeOptions& /*validated_options*/);
-
-  // Validates and/or sets default options for |MojoCreateMessagePipeOptions|.
-  // 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)
-  // |MojoCreateMessagePipeOptions| and will be entirely overwritten on success
-  // (it may be partly overwritten on failure).
-  static MojoResult ValidateCreateOptions(
-      UserPointer<const MojoCreateMessagePipeOptions> in_options,
-      MojoCreateMessagePipeOptions* out_options);
-
-  // Must be called before any other methods. (This method is not thread-safe.)
-  void Init(scoped_refptr<MessagePipe> message_pipe, unsigned port);
-
-  // |Dispatcher| public methods:
-  virtual Type GetType() const override;
-
-  // Creates a |MessagePipe| with a local endpoint (at port 0) and a proxy
-  // endpoint, and creates/initializes a |MessagePipeDispatcher| (attached to
-  // the message pipe, port 0).
-  // TODO(vtl): This currently uses |kDefaultCreateOptions|, which is okay since
-  // there aren't any options, but eventually options should be plumbed through.
-  static scoped_refptr<MessagePipeDispatcher> CreateRemoteMessagePipe(
-      scoped_refptr<ChannelEndpoint>* channel_endpoint);
-
-  // The "opposite" of |SerializeAndClose()|. (Typically this is called by
-  // |Dispatcher::Deserialize()|.)
-  static scoped_refptr<MessagePipeDispatcher> Deserialize(Channel* channel,
-                                                          const void* source,
-                                                          size_t size);
-
- private:
-  friend class MessagePipeDispatcherTransport;
-
-  virtual ~MessagePipeDispatcher();
-
-  // Gets a dumb pointer to |message_pipe_|. This must be called under the
-  // |Dispatcher| lock (that it's a dumb pointer is okay since it's under lock).
-  // This is needed when sending handles across processes, where nontrivial,
-  // invasive work needs to be done.
-  MessagePipe* GetMessagePipeNoLock() const;
-  // Similarly for the port.
-  unsigned GetPortNoLock() const;
-
-  // |Dispatcher| protected methods:
-  virtual void CancelAllWaitersNoLock() override;
-  virtual void CloseImplNoLock() override;
-  virtual scoped_refptr<Dispatcher>
-  CreateEquivalentDispatcherAndCloseImplNoLock() override;
-  virtual MojoResult WriteMessageImplNoLock(
-      UserPointer<const void> bytes,
-      uint32_t num_bytes,
-      std::vector<DispatcherTransport>* transports,
-      MojoWriteMessageFlags flags) override;
-  virtual MojoResult ReadMessageImplNoLock(UserPointer<void> bytes,
-                                           UserPointer<uint32_t> num_bytes,
-                                           DispatcherVector* dispatchers,
-                                           uint32_t* num_dispatchers,
-                                           MojoReadMessageFlags flags) override;
-  virtual HandleSignalsState GetHandleSignalsStateImplNoLock() const override;
-  virtual MojoResult AddWaiterImplNoLock(
-      Waiter* waiter,
-      MojoHandleSignals signals,
-      uint32_t context,
-      HandleSignalsState* signals_state) override;
-  virtual void RemoveWaiterImplNoLock(
-      Waiter* waiter,
-      HandleSignalsState* signals_state) override;
-  virtual void StartSerializeImplNoLock(Channel* channel,
-                                        size_t* max_size,
-                                        size_t* max_platform_handles) override;
-  virtual bool EndSerializeAndCloseImplNoLock(
-      Channel* channel,
-      void* destination,
-      size_t* actual_size,
-      embedder::PlatformHandleVector* platform_handles) override;
-
-  // Protected by |lock()|:
-  scoped_refptr<MessagePipe> message_pipe_;  // This will be null if closed.
-  unsigned port_;
-
-  DISALLOW_COPY_AND_ASSIGN(MessagePipeDispatcher);
-};
-
-class MessagePipeDispatcherTransport : public DispatcherTransport {
- public:
-  explicit MessagePipeDispatcherTransport(DispatcherTransport transport);
-
-  MessagePipe* GetMessagePipe() {
-    return message_pipe_dispatcher()->GetMessagePipeNoLock();
-  }
-  unsigned GetPort() { return message_pipe_dispatcher()->GetPortNoLock(); }
-
- private:
-  MessagePipeDispatcher* message_pipe_dispatcher() {
-    return static_cast<MessagePipeDispatcher*>(dispatcher());
-  }
-
-  // Copy and assign allowed.
-};
-
-}  // namespace system
-}  // namespace mojo
-
-#endif  // MOJO_EDK_SYSTEM_MESSAGE_PIPE_DISPATCHER_H_