Mojo: More data pipe implementation.

mojo/system/data_pipe_producer_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_DATA_PIPE_PRODUCER_DISPATCHER_H_
+#define MOJO_SYSTEM_DATA_PIPE_PRODUCER_DISPATCHER_H_
+
+#include "base/basictypes.h"
+#include "base/compiler_specific.h"
+#include "base/memory/ref_counted.h"
+#include "mojo/system/dispatcher.h"
+#include "mojo/system/system_impl_export.h"
+
+namespace mojo {
+namespace system {
+
+class DataPipe;
+
+// This is the |Dispatcher| implementation for the producer handle for data
+// pipes (created by the Mojo primitive |MojoCreateDataPipe()|). This class is
+// thread-safe.
+class MOJO_SYSTEM_IMPL_EXPORT DataPipeProducerDispatcher : public Dispatcher {
+ public:
+  DataPipeProducerDispatcher();
+
+  // Must be called before any other methods.
+  void Init(scoped_refptr<DataPipe> data_pipe);
+
+ private:
+  friend class base::RefCountedThreadSafe<DataPipeProducerDispatcher>;
+  virtual ~DataPipeProducerDispatcher();
+
+  // |Dispatcher| implementation/overrides:
+  virtual void CancelAllWaitersNoLock() OVERRIDE;
+  virtual MojoResult CloseImplNoLock() OVERRIDE;
+  virtual MojoResult WriteDataImplNoLock(const void* elements,
+                                         uint32_t* num_elements,
+                                         MojoWriteDataFlags flags) OVERRIDE;
+  virtual MojoResult BeginWriteDataImplNoLock(
+      void** buffer,
+      uint32_t* buffer_num_elements,
+      MojoWriteDataFlags flags) OVERRIDE;
+  virtual MojoResult EndWriteDataImplNoLock(
+      uint32_t num_elements_written) OVERRIDE;
+  virtual MojoResult AddWaiterImplNoLock(Waiter* waiter,
+                                         MojoWaitFlags flags,
+                                         MojoResult wake_result) OVERRIDE;
+  virtual void RemoveWaiterImplNoLock(Waiter* waiter) OVERRIDE;
+  virtual scoped_refptr<Dispatcher>
+      CreateEquivalentDispatcherAndCloseImplNoLock() OVERRIDE;
+
+  // Protected by |lock()|:
+  scoped_refptr<DataPipe> data_pipe_;  // This will be null if closed.
+
+  DISALLOW_COPY_AND_ASSIGN(DataPipeProducerDispatcher);
+};
+
+}  // namespace system
+}  // namespace mojo
+
+#endif  // MOJO_SYSTEM_DATA_PIPE_PRODUCER_DISPATCHER_H_