blob: dad99fabd5ae72cef0ac7943f77d536bc19a65c4 [file] [log] [blame]
// Copyright 2014 The Chromium Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#include <memory>
#include "base/macros.h"
#include "base/message_loop/message_pump_for_io.h"
#include "base/single_thread_task_runner.h"
#include "base/threading/thread_task_runner_handle.h"
#include "device/serial/serial_io_handler.h"
namespace device {
class SerialIoHandlerWin : public SerialIoHandler,
public base::MessagePumpForIO::IOHandler {
// SerialIoHandler implementation.
void ReadImpl() override;
void WriteImpl() override;
void CancelReadImpl() override;
void CancelWriteImpl() override;
bool ConfigurePortImpl() override;
bool Flush() const override;
mojom::SerialDeviceControlSignalsPtr GetControlSignals() const override;
bool SetControlSignals(
const mojom::SerialHostControlSignals& control_signals) override;
mojom::SerialConnectionInfoPtr GetPortInfo() const override;
bool SetBreak() override;
bool ClearBreak() override;
bool PostOpen() override;
class UiThreadHelper;
friend class SerialIoHandler;
explicit SerialIoHandlerWin(
scoped_refptr<base::SingleThreadTaskRunner> ui_thread_task_runner);
~SerialIoHandlerWin() override;
// base::MessagePumpForIO::IOHandler implementation.
void OnIOCompleted(base::MessagePumpForIO::IOContext* context,
DWORD bytes_transfered,
DWORD error) override;
void OnDeviceRemoved(const std::string& device_path);
// Context used for asynchronous WaitCommEvent calls.
std::unique_ptr<base::MessagePumpForIO::IOContext> comm_context_;
// Context used for overlapped reads.
std::unique_ptr<base::MessagePumpForIO::IOContext> read_context_;
// Context used for overlapped writes.
std::unique_ptr<base::MessagePumpForIO::IOContext> write_context_;
// Asynchronous event mask state
DWORD event_mask_;
// Indicates if a pending read is waiting on initial data arrival via
// WaitCommEvent, as opposed to waiting on actual ReadFile completion
// after a corresponding WaitCommEvent has completed.
bool is_comm_pending_;
// The helper lives on the UI thread and holds a weak reference back to the
// handler that owns it.
UiThreadHelper* helper_;
base::WeakPtrFactory<SerialIoHandlerWin> weak_factory_;
} // namespace device