device/serial/serial_io_handler_win.h

   1 // Copyright 2014 The Chromium Authors. All rights reserved.
   2 // Use of this source code is governed by a BSD-style license that can be
   3 // found in the LICENSE file.
   4
   5 #ifndef DEVICE_SERIAL_SERIAL_IO_HANDLER_WIN_H_
   6 #define DEVICE_SERIAL_SERIAL_IO_HANDLER_WIN_H_
   7
   8 #include "base/memory/scoped_ptr.h"
   9 #include "base/message_loop/message_loop.h"
  10 #include "device/serial/serial_io_handler.h"
  11
  12 namespace device {
  13
  14 class SerialIoHandlerWin : public SerialIoHandler,
  15                            public base::MessageLoopForIO::IOHandler {
  16  protected:
  17   // SerialIoHandler implementation.
  18   virtual void ReadImpl() override;
  19   virtual void WriteImpl() override;
  20   virtual void CancelReadImpl() override;
  21   virtual void CancelWriteImpl() override;
  22   virtual bool ConfigurePortImpl() override;
  23   virtual bool Flush() const override;
  24   virtual serial::DeviceControlSignalsPtr GetControlSignals() const override;
  25   virtual bool SetControlSignals(
  26       const serial::HostControlSignals& control_signals) override;
  27   virtual serial::ConnectionInfoPtr GetPortInfo() const override;
  28   virtual bool PostOpen() override;
  29
  30  private:
  31   friend class SerialIoHandler;
  32
  33   explicit SerialIoHandlerWin(
  34       scoped_refptr<base::MessageLoopProxy> file_thread_message_loop,
  35       scoped_refptr<base::MessageLoopProxy> ui_thread_message_loop);
  36   virtual ~SerialIoHandlerWin();
  37
  38   // base::MessageLoopForIO::IOHandler implementation.
  39   virtual void OnIOCompleted(base::MessageLoopForIO::IOContext* context,
  40                              DWORD bytes_transfered,
  41                              DWORD error) override;
  42
  43   // Context used for asynchronous WaitCommEvent calls.
  44   scoped_ptr<base::MessageLoopForIO::IOContext> comm_context_;
  45
  46   // Context used for overlapped reads.
  47   scoped_ptr<base::MessageLoopForIO::IOContext> read_context_;
  48
  49   // Context used for overlapped writes.
  50   scoped_ptr<base::MessageLoopForIO::IOContext> write_context_;
  51
  52   // Asynchronous event mask state
  53   DWORD event_mask_;
  54
  55   // Indicates if a pending read is waiting on initial data arrival via
  56   // WaitCommEvent, as opposed to waiting on actual ReadFile completion
  57   // after a corresponding WaitCommEvent has completed.
  58   bool is_comm_pending_;
  59
  60   DISALLOW_COPY_AND_ASSIGN(SerialIoHandlerWin);
  61 };
  62
  63 }  // namespace device
  64
  65 #endif  // DEVICE_SERIAL_SERIAL_IO_HANDLER_WIN_H_