root/chrome/browser/extensions/api/serial/serial_io_handler_win.h

INCLUDED FROM

// 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 CHROME_BROWSER_EXTENSIONS_API_SERIAL_SERIAL_IO_HANDLER_WIN_H_
#define CHROME_BROWSER_EXTENSIONS_API_SERIAL_SERIAL_IO_HANDLER_WIN_H_

#include "base/memory/scoped_ptr.h"
#include "base/message_loop/message_loop.h"
#include "chrome/browser/extensions/api/serial/serial_io_handler.h"

namespace extensions {

class SerialIoHandlerWin : public SerialIoHandler,
                           public base::MessageLoopForIO::IOHandler {
 protected:
  // SerialIoHandler implementation.
  virtual void InitializeImpl() OVERRIDE;
  virtual void ReadImpl() OVERRIDE;
  virtual void WriteImpl() OVERRIDE;
  virtual void CancelReadImpl() OVERRIDE;
  virtual void CancelWriteImpl() OVERRIDE;

 private:
  friend class SerialIoHandler;

  SerialIoHandlerWin();
  virtual ~SerialIoHandlerWin();

  // base::MessageLoopForIO::IOHandler implementation.
  virtual void OnIOCompleted(base::MessageLoopForIO::IOContext* context,
                             DWORD bytes_transfered,
                             DWORD error) OVERRIDE;

  // Context used for asynchronous WaitCommEvent calls.
  scoped_ptr<base::MessageLoopForIO::IOContext> comm_context_;

  // Context used for overlapped reads.
  scoped_ptr<base::MessageLoopForIO::IOContext> read_context_;

  // Context used for overlapped writes.
  scoped_ptr<base::MessageLoopForIO::IOContext> write_context_;

  // Asynchronous event mask state
  DWORD event_mask_;

  // Indicates if a pending read is waiting on initial data arrival via
  // WaitCommEvent, as opposed to waiting on actual ReadFile completion
  // after a corresponding WaitCommEvent has completed.
  bool is_comm_pending_;

  DISALLOW_COPY_AND_ASSIGN(SerialIoHandlerWin);
};

}  // namespace extensions

#endif  // CHROME_BROWSER_EXTENSIONS_API_SERIAL_SERIAL_IO_HANDLER_WIN_H_