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.
5 #ifndef DEVICE_SERIAL_SERIAL_IO_HANDLER_WIN_H_
6 #define DEVICE_SERIAL_SERIAL_IO_HANDLER_WIN_H_
10 #include "base/macros.h"
11 #include "base/message_loop/message_pump_for_io.h"
12 #include "base/single_thread_task_runner.h"
13 #include "base/threading/thread_task_runner_handle.h"
14 #include "device/serial/serial_io_handler.h"
18 class SerialIoHandlerWin : public SerialIoHandler,
19 public base::MessagePumpForIO::IOHandler {
21 // SerialIoHandler implementation.
22 void ReadImpl() override;
23 void WriteImpl() override;
24 void CancelReadImpl() override;
25 void CancelWriteImpl() override;
26 bool ConfigurePortImpl() override;
27 bool Flush() const override;
28 mojom::SerialDeviceControlSignalsPtr GetControlSignals() const override;
29 bool SetControlSignals(
30 const mojom::SerialHostControlSignals& control_signals) override;
31 mojom::SerialConnectionInfoPtr GetPortInfo() const override;
32 bool SetBreak() override;
33 bool ClearBreak() override;
34 bool PostOpen() override;
38 friend class SerialIoHandler;
40 explicit SerialIoHandlerWin(
41 scoped_refptr<base::SingleThreadTaskRunner> ui_thread_task_runner);
42 ~SerialIoHandlerWin() override;
44 // base::MessagePumpForIO::IOHandler implementation.
45 void OnIOCompleted(base::MessagePumpForIO::IOContext* context,
46 DWORD bytes_transfered,
47 DWORD error) override;
49 void OnDeviceRemoved(const std::string& device_path);
51 // Context used for asynchronous WaitCommEvent calls.
52 std::unique_ptr<base::MessagePumpForIO::IOContext> comm_context_;
54 // Context used for overlapped reads.
55 std::unique_ptr<base::MessagePumpForIO::IOContext> read_context_;
57 // Context used for overlapped writes.
58 std::unique_ptr<base::MessagePumpForIO::IOContext> write_context_;
60 // Asynchronous event mask state
63 // Indicates if a pending read is waiting on initial data arrival via
64 // WaitCommEvent, as opposed to waiting on actual ReadFile completion
65 // after a corresponding WaitCommEvent has completed.
66 bool is_comm_pending_;
68 // The helper lives on the UI thread and holds a weak reference back to the
69 // handler that owns it.
70 UiThreadHelper* helper_;
71 base::WeakPtrFactory<SerialIoHandlerWin> weak_factory_;
73 DISALLOW_COPY_AND_ASSIGN(SerialIoHandlerWin);
78 #endif // DEVICE_SERIAL_SERIAL_IO_HANDLER_WIN_H_