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// 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.
#ifndef DEVICE_SERIAL_SERIAL_IO_HANDLER_WIN_H_
#define DEVICE_SERIAL_SERIAL_IO_HANDLER_WIN_H_
#include "base/memory/scoped_ptr.h"
#include "base/message_loop/message_loop.h"
#include "base/single_thread_task_runner.h"
#include "base/thread_task_runner_handle.h"
#include "device/serial/serial_io_handler.h"
namespace device {
class SerialIoHandlerWin : public SerialIoHandler,
public base::MessageLoopForIO::IOHandler {
protected:
// SerialIoHandler implementation.
void ReadImpl() override;
void WriteImpl() override;
void CancelReadImpl() override;
void CancelWriteImpl() override;
bool ConfigurePortImpl() override;
bool Flush() const override;
serial::DeviceControlSignalsPtr GetControlSignals() const override;
bool SetControlSignals(
const serial::HostControlSignals& control_signals) override;
serial::ConnectionInfoPtr GetPortInfo() const override;
bool SetBreak() override;
bool ClearBreak() override;
bool PostOpen() override;
private:
class UiThreadHelper;
friend class SerialIoHandler;
explicit SerialIoHandlerWin(
scoped_refptr<base::SingleThreadTaskRunner> file_thread_task_runner,
scoped_refptr<base::SingleThreadTaskRunner> ui_thread_task_runner);
~SerialIoHandlerWin() override;
// base::MessageLoopForIO::IOHandler implementation.
void OnIOCompleted(base::MessageLoopForIO::IOContext* context,
DWORD bytes_transfered,
DWORD error) override;
void OnDeviceRemoved(const std::string& device_path);
// Context used for asynchronous WaitCommEvent calls.
scoped_ptr<base::MessageLoopForIO::IOContext> comm_context_;
// Context used for overlapped reads.
scoped_ptr<base::MessageLoopForIO::IOContext> read_context_;
// Context used for overlapped writes.
scoped_ptr<base::MessageLoopForIO::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_ = nullptr;
base::WeakPtrFactory<SerialIoHandlerWin> weak_factory_;
DISALLOW_COPY_AND_ASSIGN(SerialIoHandlerWin);
};
} // namespace device
#endif // DEVICE_SERIAL_SERIAL_IO_HANDLER_WIN_H_
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