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 SetBreak() override;
  31   bool ClearBreak() override;
  32   bool PostOpen() override;
  33
  34  private:
  35   friend class SerialIoHandler;
  36
  37   explicit SerialIoHandlerWin(
  38       scoped_refptr<base::SingleThreadTaskRunner> file_thread_task_runner,
  39       scoped_refptr<base::SingleThreadTaskRunner> ui_thread_task_runner);
  40   ~SerialIoHandlerWin() override;
  41
  42   // base::MessageLoopForIO::IOHandler implementation.
  43   void OnIOCompleted(base::MessageLoopForIO::IOContext* context,
  44                      DWORD bytes_transfered,
  45                      DWORD error) override;
  46
  47   // Context used for asynchronous WaitCommEvent calls.
  48   scoped_ptr<base::MessageLoopForIO::IOContext> comm_context_;
  49
  50   // Context used for overlapped reads.
  51   scoped_ptr<base::MessageLoopForIO::IOContext> read_context_;
  52
  53   // Context used for overlapped writes.
  54   scoped_ptr<base::MessageLoopForIO::IOContext> write_context_;
  55
  56   // Asynchronous event mask state
  57   DWORD event_mask_;
  58
  59   // Indicates if a pending read is waiting on initial data arrival via
  60   // WaitCommEvent, as opposed to waiting on actual ReadFile completion
  61   // after a corresponding WaitCommEvent has completed.
  62   bool is_comm_pending_;
  63
  64   DISALLOW_COPY_AND_ASSIGN(SerialIoHandlerWin);
  65 };
  66
  67 }  // namespace device
  68
  69 #endif  // DEVICE_SERIAL_SERIAL_IO_HANDLER_WIN_H_