1 // Copyright 2013 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 CHROME_BROWSER_EXTENSIONS_API_SERIAL_SERIAL_IO_HANDLER_WIN_H_ 6 #define CHROME_BROWSER_EXTENSIONS_API_SERIAL_SERIAL_IO_HANDLER_WIN_H_ 7 8 #include "base/memory/scoped_ptr.h" 9 #include "base/message_loop/message_loop.h" 10 #include "chrome/browser/extensions/api/serial/serial_io_handler.h" 11 12 namespace extensions { 13 14 class SerialIoHandlerWin : public SerialIoHandler, 15 public base::MessageLoopForIO::IOHandler { 16 protected: 17 // SerialIoHandler implementation. 18 virtual void InitializeImpl() OVERRIDE; 19 virtual void ReadImpl() OVERRIDE; 20 virtual void WriteImpl() OVERRIDE; 21 virtual void CancelReadImpl() OVERRIDE; 22 virtual void CancelWriteImpl() OVERRIDE; 23 24 private: 25 friend class SerialIoHandler; 26 27 SerialIoHandlerWin(); 28 virtual ~SerialIoHandlerWin(); 29 30 // base::MessageLoopForIO::IOHandler implementation. 31 virtual void OnIOCompleted(base::MessageLoopForIO::IOContext* context, 32 DWORD bytes_transfered, 33 DWORD error) OVERRIDE; 34 35 // Context used for asynchronous WaitCommEvent calls. 36 scoped_ptr<base::MessageLoopForIO::IOContext> comm_context_; 37 38 // Context used for overlapped reads. 39 scoped_ptr<base::MessageLoopForIO::IOContext> read_context_; 40 41 // Context used for overlapped writes. 42 scoped_ptr<base::MessageLoopForIO::IOContext> write_context_; 43 44 // Asynchronous event mask state 45 DWORD event_mask_; 46 47 // Indicates if a pending read is waiting on initial data arrival via 48 // WaitCommEvent, as opposed to waiting on actual ReadFile completion 49 // after a corresponding WaitCommEvent has completed. 50 bool is_comm_pending_; 51 52 DISALLOW_COPY_AND_ASSIGN(SerialIoHandlerWin); 53 }; 54 55 } // namespace extensions 56 57 #endif // CHROME_BROWSER_EXTENSIONS_API_SERIAL_SERIAL_IO_HANDLER_WIN_H_ 58 59