Revert "Move mojo edk into mojo/edk"

mojo/edk/system/message_pipe.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_H_
-#define MOJO_EDK_SYSTEM_MESSAGE_PIPE_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/edk/system/dispatcher.h"
-#include "mojo/edk/system/handle_signals_state.h"
-#include "mojo/edk/system/memory.h"
-#include "mojo/edk/system/message_in_transit.h"
-#include "mojo/edk/system/message_pipe_endpoint.h"
-#include "mojo/edk/system/system_impl_export.h"
-#include "mojo/public/c/system/message_pipe.h"
-#include "mojo/public/c/system/types.h"
-
-namespace mojo {
-namespace system {
-
-class ChannelEndpoint;
-class Waiter;
-
-// |MessagePipe| is the secondary object implementing a message pipe (see the
-// explanatory comment in core.cc). It is typically owned by the dispatcher(s)
-// corresponding to the local endpoints. This class is thread-safe.
-class MOJO_SYSTEM_IMPL_EXPORT MessagePipe
-    : public base::RefCountedThreadSafe<MessagePipe> {
- public:
-  // Creates a |MessagePipe| with two new |LocalMessagePipeEndpoint|s.
-  static MessagePipe* CreateLocalLocal();
-
-  // Creates a |MessagePipe| with a |LocalMessagePipeEndpoint| on port 0 and a
-  // |ProxyMessagePipeEndpoint| on port 1. |*channel_endpoint| is set to the
-  // (newly-created) |ChannelEndpoint| for the latter.
-  static MessagePipe* CreateLocalProxy(
-      scoped_refptr<ChannelEndpoint>* channel_endpoint);
-
-  // Creates a |MessagePipe| with a |ProxyMessagePipeEndpoint| on port 0 and a
-  // |LocalMessagePipeEndpoint| on port 1. |*channel_endpoint| is set to the
-  // (newly-created) |ChannelEndpoint| for the former.
-  // Note: This is really only needed in tests (outside of tests, this
-  // configuration arises from a local message pipe having its port 0
-  // "converted" using |ConvertLocalToProxy()|).
-  static MessagePipe* CreateProxyLocal(
-      scoped_refptr<ChannelEndpoint>* channel_endpoint);
-
-  // Gets the other port number (i.e., 0 -> 1, 1 -> 0).
-  static unsigned GetPeerPort(unsigned port);
-
-  // Gets the type of the endpoint (used for assertions, etc.).
-  MessagePipeEndpoint::Type GetType(unsigned port);
-
-  // These are called by the dispatcher to implement its methods of
-  // corresponding names. In all cases, the port |port| must be open.
-  void CancelAllWaiters(unsigned port);
-  void Close(unsigned port);
-  // Unlike |MessagePipeDispatcher::WriteMessage()|, this does not validate its
-  // arguments.
-  MojoResult WriteMessage(unsigned port,
-                          UserPointer<const void> bytes,
-                          uint32_t num_bytes,
-                          std::vector<DispatcherTransport>* transports,
-                          MojoWriteMessageFlags flags);
-  MojoResult ReadMessage(unsigned port,
-                         UserPointer<void> bytes,
-                         UserPointer<uint32_t> num_bytes,
-                         DispatcherVector* dispatchers,
-                         uint32_t* num_dispatchers,
-                         MojoReadMessageFlags flags);
-  HandleSignalsState GetHandleSignalsState(unsigned port) const;
-  MojoResult AddWaiter(unsigned port,
-                       Waiter* waiter,
-                       MojoHandleSignals signals,
-                       uint32_t context,
-                       HandleSignalsState* signals_state);
-  void RemoveWaiter(unsigned port,
-                    Waiter* waiter,
-                    HandleSignalsState* signals_state);
-
-  // This is called by the dispatcher to convert a local endpoint to a proxy
-  // endpoint.
-  scoped_refptr<ChannelEndpoint> ConvertLocalToProxy(unsigned port);
-
-  // This is used by |Channel| to enqueue messages (typically to a
-  // |LocalMessagePipeEndpoint|). Unlike |WriteMessage()|, |port| is the
-  // *destination* port.
-  MojoResult EnqueueMessage(unsigned port,
-                            scoped_ptr<MessageInTransit> message);
-
- private:
-  MessagePipe();
-
-  friend class base::RefCountedThreadSafe<MessagePipe>;
-  virtual ~MessagePipe();
-
-  // This is used internally by |WriteMessage()| and by |EnqueueMessage()|.
-  // |transports| may be non-null only if it's nonempty and |message| has no
-  // dispatchers attached.
-  MojoResult EnqueueMessageInternal(
-      unsigned port,
-      scoped_ptr<MessageInTransit> message,
-      std::vector<DispatcherTransport>* transports);
-
-  // Helper for |EnqueueMessageInternal()|. Must be called with |lock_| held.
-  MojoResult AttachTransportsNoLock(
-      unsigned port,
-      MessageInTransit* message,
-      std::vector<DispatcherTransport>* transports);
-
-  // Used by |EnqueueMessageInternal()| to handle control messages that are
-  // actually meant for us.
-  MojoResult HandleControlMessage(unsigned port,
-                                  scoped_ptr<MessageInTransit> message);
-
-  base::Lock lock_;  // Protects the following members.
-  scoped_ptr<MessagePipeEndpoint> endpoints_[2];
-
-  DISALLOW_COPY_AND_ASSIGN(MessagePipe);
-};
-
-}  // namespace system
-}  // namespace mojo
-
-#endif  // MOJO_EDK_SYSTEM_MESSAGE_PIPE_H_