device/serial/serial_io_handler_posix.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_POSIX_H_
   6 #define DEVICE_SERIAL_SERIAL_IO_HANDLER_POSIX_H_
   7
   8 #include "base/message_loop/message_loop.h"
   9 #include "base/single_thread_task_runner.h"
  10 #include "base/thread_task_runner_handle.h"
  11 #include "device/serial/serial_io_handler.h"
  12
  13 namespace device {
  14
  15 class SerialIoHandlerPosix : public SerialIoHandler,
  16                              public base::MessageLoopForIO::Watcher {
  17  protected:
  18   // SerialIoHandler impl.
  19   void ReadImpl() override;
  20   void WriteImpl() override;
  21   void CancelReadImpl() override;
  22   void CancelWriteImpl() override;
  23   bool ConfigurePortImpl() override;
  24   bool Flush() const override;
  25   serial::DeviceControlSignalsPtr GetControlSignals() const override;
  26   bool SetControlSignals(
  27       const serial::HostControlSignals& control_signals) override;
  28   serial::ConnectionInfoPtr GetPortInfo() const override;
  29   void RequestAccess(
  30       const std::string& port,
  31       scoped_refptr<base::SingleThreadTaskRunner> file_task_runner,
  32       scoped_refptr<base::SingleThreadTaskRunner> ui_task_runner) override;
  33
  34  private:
  35   friend class SerialIoHandler;
  36
  37   SerialIoHandlerPosix(
  38       scoped_refptr<base::SingleThreadTaskRunner> file_thread_task_runner,
  39       scoped_refptr<base::SingleThreadTaskRunner> ui_thread_task_runner);
  40   ~SerialIoHandlerPosix() override;
  41
  42   // base::MessageLoopForIO::Watcher implementation.
  43   void OnFileCanWriteWithoutBlocking(int fd) override;
  44   void OnFileCanReadWithoutBlocking(int fd) override;
  45
  46   void EnsureWatchingReads();
  47   void EnsureWatchingWrites();
  48
  49   base::MessageLoopForIO::FileDescriptorWatcher file_read_watcher_;
  50   base::MessageLoopForIO::FileDescriptorWatcher file_write_watcher_;
  51
  52   // Flags indicating if the message loop is watching the device for IO events.
  53   bool is_watching_reads_;
  54   bool is_watching_writes_;
  55
  56   DISALLOW_COPY_AND_ASSIGN(SerialIoHandlerPosix);
  57 };
  58
  59 }  // namespace device
  60
  61 #endif  // DEVICE_SERIAL_SERIAL_IO_HANDLER_POSIX_H_