[mojo] Ports EDK

mojo/edk/system/data_pipe_consumer_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_DATA_PIPE_CONSUMER_DISPATCHER_H_
 #define MOJO_EDK_SYSTEM_DATA_PIPE_CONSUMER_DISPATCHER_H_
 
 #include <stddef.h>
 #include <stdint.h>
 
+#include "base/macros.h"
 #include "base/memory/ref_counted.h"
+#include "base/memory/scoped_ptr.h"
+#include "base/synchronization/lock.h"
+#include "mojo/edk/embedder/platform_handle_vector.h"
+#include "mojo/edk/embedder/platform_shared_buffer.h"
+#include "mojo/edk/embedder/scoped_platform_handle.h"
 #include "mojo/edk/system/awakable_list.h"
 #include "mojo/edk/system/dispatcher.h"
-#include "mojo/edk/system/raw_channel.h"
+#include "mojo/edk/system/ports/port_ref.h"
 #include "mojo/edk/system/system_impl_export.h"
-#include "mojo/public/cpp/system/macros.h"
 
 namespace mojo {
 namespace edk {
 
-// This is the |Dispatcher| implementation for the consumer handle for data
-// pipes (created by the Mojo primitive |MojoCreateDataPipe()|). This class is
+struct DataPipeControlMessage;
+class NodeController;
+
+// This is the Dispatcher implementation for the consumer handle for data
+// pipes created by the Mojo primitive MojoCreateDataPipe(). This class is
 // thread-safe.
 class MOJO_SYSTEM_IMPL_EXPORT DataPipeConsumerDispatcher final
-    : public Dispatcher, public RawChannel::Delegate {
+    : public Dispatcher {
  public:
-  static scoped_refptr<DataPipeConsumerDispatcher> Create(
-      const MojoCreateDataPipeOptions& options) {
-    return make_scoped_refptr(new DataPipeConsumerDispatcher(options));
-  }
+  DataPipeConsumerDispatcher(
+      NodeController* node_controller,
+      const ports::PortRef& control_port,
+      scoped_refptr<PlatformSharedBuffer> shared_ring_buffer,
+      const MojoCreateDataPipeOptions& options,
+      bool initialized,
+      uint64_t pipe_id);
 
-  // Must be called before any other methods.
-  void Init(ScopedPlatformHandle message_pipe,
-            char* serialized_read_buffer, size_t serialized_read_buffer_size);
+  // Dispatcher:
+  Type GetType() const override;
+  MojoResult Close() override;
+  MojoResult ReadData(void* elements,
+                      uint32_t* num_bytes,
+                      MojoReadDataFlags flags) override;
+  MojoResult BeginReadData(const void** buffer,
+                           uint32_t* buffer_num_bytes,
+                           MojoReadDataFlags flags) override;
+  MojoResult EndReadData(uint32_t num_bytes_read) override;
+  HandleSignalsState GetHandleSignalsState() const override;
+  MojoResult AddAwakable(Awakable* awakable,
+                         MojoHandleSignals signals,
+                         uintptr_t context,
+                         HandleSignalsState* signals_state) override;
+  void RemoveAwakable(Awakable* awakable,
+                      HandleSignalsState* signals_state) override;
+  void StartSerialize(uint32_t* num_bytes,
+                      uint32_t* num_ports,
+                      uint32_t* num_handles) override;
+  bool EndSerialize(void* destination,
+                    ports::PortName* ports,
+                    PlatformHandle* handles) override;
+  bool BeginTransit() override;
+  void CompleteTransitAndClose() override;
+  void CancelTransit() override;
 
-  // |Dispatcher| public methods:
-  Type GetType() const override;
-
-  // The "opposite" of |SerializeAndClose()|. (Typically this is called by
-  // |Dispatcher::Deserialize()|.)
   static scoped_refptr<DataPipeConsumerDispatcher>
-  Deserialize(const void* source,
-              size_t size,
-              PlatformHandleVector* platform_handles);
+  Deserialize(const void* data,
+              size_t num_bytes,
+              const ports::PortName* ports,
+              size_t num_ports,
+              PlatformHandle* handles,
+              size_t num_handles);
 
  private:
-  DataPipeConsumerDispatcher(const MojoCreateDataPipeOptions& options);
+  class PortObserverThunk;
+  friend class PortObserverThunk;
+
   ~DataPipeConsumerDispatcher() override;
 
-  void InitOnIO();
-  void CloseOnIO();
+  void InitializeNoLock();
+  MojoResult CloseNoLock();
+  HandleSignalsState GetHandleSignalsStateNoLock() const;
+  void NotifyRead(uint32_t num_bytes);
+  void OnPortStatusChanged();
+  void UpdateSignalsStateNoLock();
 
-  // |Dispatcher| protected methods:
-  void CancelAllAwakablesNoLock() override;
-  void CloseImplNoLock() override;
-  scoped_refptr<Dispatcher> CreateEquivalentDispatcherAndCloseImplNoLock()
-      override;
-  MojoResult ReadDataImplNoLock(void* elements,
-                                uint32_t* num_bytes,
-                                MojoReadDataFlags flags) override;
-  MojoResult BeginReadDataImplNoLock(const void** buffer,
-                                     uint32_t* buffer_num_bytes,
-                                     MojoReadDataFlags flags) override;
-  MojoResult EndReadDataImplNoLock(uint32_t num_bytes_read) override;
-  HandleSignalsState GetHandleSignalsStateImplNoLock() const override;
-  MojoResult AddAwakableImplNoLock(Awakable* awakable,
-                                   MojoHandleSignals signals,
-                                   uintptr_t context,
-                                   HandleSignalsState* signals_state) override;
-  void RemoveAwakableImplNoLock(Awakable* awakable,
-                                HandleSignalsState* signals_state) override;
-  void StartSerializeImplNoLock(size_t* max_size,
-                                size_t* max_platform_handles) override;
-  bool EndSerializeAndCloseImplNoLock(
-      void* destination,
-      size_t* actual_size,
-      PlatformHandleVector* platform_handles) override;
-  void TransportStarted() override;
-  void TransportEnded() override;
-  bool IsBusyNoLock() const override;
+  const MojoCreateDataPipeOptions options_;
+  NodeController* const node_controller_;
+  const ports::PortRef control_port_;
+  const uint64_t pipe_id_;
 
-  // |RawChannel::Delegate methods:
-  void OnReadMessage(
-    const MessageInTransit::View& message_view,
-    ScopedPlatformHandleVectorPtr platform_handles) override;
-  void OnError(Error error) override;
+  // Guards access to the fields below.
+  mutable base::Lock lock_;
 
-  // See comment in MessagePipeDispatcher for this method.
-  void SerializeInternal();
-
-  MojoCreateDataPipeOptions options_;
-
-  // Protected by |lock()|:
-  RawChannel* channel_;  // This will be null if closed.
-
-  // Queue of incoming messages.
-  std::vector<char> data_;
   AwakableList awakable_list_;
 
-  // If DispatcherTransport is created. Must be set before lock() is called to
-  // avoid deadlocks with RawChannel calling us.
-  base::Lock started_transport_;
+  scoped_refptr<PlatformSharedBuffer> shared_ring_buffer_;
+  scoped_ptr<PlatformSharedBufferMapping> ring_buffer_mapping_;
+  ScopedPlatformHandle buffer_handle_for_transit_;
 
-  bool calling_init_;
+  bool in_two_phase_read_ = false;
+  uint32_t two_phase_max_bytes_read_ = 0;
 
-  bool in_two_phase_read_;
-  uint32_t two_phase_max_bytes_read_;
-  // If we get data from the channel while we're in two-phase read, we can't
-  // resize data_ since it's being used. So instead we store it temporarly.
-  std::vector<char> data_received_during_two_phase_read_;
+  bool in_transit_ = false;
+  bool is_closed_ = false;
+  bool peer_closed_ = false;
+  bool transferred_ = false;
 
-  bool error_;
+  uint32_t read_offset_ = 0;
+  uint32_t bytes_available_ = 0;
 
-  bool serialized_;
-  std::vector<char> serialized_read_buffer_;
-  ScopedPlatformHandle serialized_platform_handle_;
-
-  MOJO_DISALLOW_COPY_AND_ASSIGN(DataPipeConsumerDispatcher);
+  DISALLOW_COPY_AND_ASSIGN(DataPipeConsumerDispatcher);
 };
 
 }  // namespace edk
 }  // namespace mojo
 
 #endif  // MOJO_EDK_SYSTEM_DATA_PIPE_CONSUMER_DISPATCHER_H_