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 "base/single_thread_task_runner.h"
  11 #include "base/thread_task_runner_handle.h"
  12 #include "device/serial/serial_io_handler.h"
  13
  14 namespace device {
  15
  16 class SerialIoHandlerWin : public SerialIoHandler,
  17                            public base::MessageLoopForIO::IOHandler {
  18  protected:
  19   // SerialIoHandler implementation.
  20   void ReadImpl() override;
  21   void WriteImpl() override;
  22   void CancelReadImpl() override;
  23   void CancelWriteImpl() override;
  24   bool ConfigurePortImpl() override;
  25   bool Flush() const override;
  26   serial::DeviceControlSignalsPtr GetControlSignals() const override;
  27   bool SetControlSignals(
  28       const serial::HostControlSignals& control_signals) override;
  29   serial::ConnectionInfoPtr GetPortInfo() const override;
  30   bool PostOpen() override;
  31
  32  private:
  33   friend class SerialIoHandler;
  34
  35   explicit SerialIoHandlerWin(
  36       scoped_refptr<base::SingleThreadTaskRunner> file_thread_task_runner,
  37       scoped_refptr<base::SingleThreadTaskRunner> ui_thread_task_runner);
  38   ~SerialIoHandlerWin() override;
  39
  40   // base::MessageLoopForIO::IOHandler implementation.
  41   void OnIOCompleted(base::MessageLoopForIO::IOContext* context,
  42                      DWORD bytes_transfered,
  43                      DWORD error) override;
  44
  45   // Context used for asynchronous WaitCommEvent calls.
  46   scoped_ptr<base::MessageLoopForIO::IOContext> comm_context_;
  47
  48   // Context used for overlapped reads.
  49   scoped_ptr<base::MessageLoopForIO::IOContext> read_context_;
  50
  51   // Context used for overlapped writes.
  52   scoped_ptr<base::MessageLoopForIO::IOContext> write_context_;
  53
  54   // Asynchronous event mask state
  55   DWORD event_mask_;
  56
  57   // Indicates if a pending read is waiting on initial data arrival via
  58   // WaitCommEvent, as opposed to waiting on actual ReadFile completion
  59   // after a corresponding WaitCommEvent has completed.
  60   bool is_comm_pending_;
  61
  62   DISALLOW_COPY_AND_ASSIGN(SerialIoHandlerWin);
  63 };
  64
  65 }  // namespace device
  66
  67 #endif  // DEVICE_SERIAL_SERIAL_IO_HANDLER_WIN_H_