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   bool SetBreak() override;
  30   bool ClearBreak() override;
  31
  32  private:
  33   friend class SerialIoHandler;
  34
  35   SerialIoHandlerPosix(
  36       scoped_refptr<base::SingleThreadTaskRunner> file_thread_task_runner,
  37       scoped_refptr<base::SingleThreadTaskRunner> ui_thread_task_runner);
  38   ~SerialIoHandlerPosix() override;
  39
  40   // base::MessageLoopForIO::Watcher implementation.
  41   void OnFileCanWriteWithoutBlocking(int fd) override;
  42   void OnFileCanReadWithoutBlocking(int fd) override;
  43
  44   void EnsureWatchingReads();
  45   void EnsureWatchingWrites();
  46
  47   base::MessageLoopForIO::FileDescriptorWatcher file_read_watcher_;
  48   base::MessageLoopForIO::FileDescriptorWatcher file_write_watcher_;
  49
  50   // Flags indicating if the message loop is watching the device for IO events.
  51   bool is_watching_reads_;
  52   bool is_watching_writes_;
  53
  54   DISALLOW_COPY_AND_ASSIGN(SerialIoHandlerPosix);
  55 };
  56
  57 }  // namespace device
  58
  59 #endif  // DEVICE_SERIAL_SERIAL_IO_HANDLER_POSIX_H_