File indexing completed on 2024-05-05 17:50:04

 /*
    Copyright (C) 2015 Andreas Hartmetz <ahartmetz@gmail.com>
 
    This library is free software; you can redistribute it and/or
    modify it under the terms of the GNU Library General Public
    License as published by the Free Software Foundation; either
    version 2 of the License, or (at your option) any later version.
 
    This library is distributed in the hope that it will be useful,
    but WITHOUT ANY WARRANTY; without even the implied warranty of
    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
    Library General Public License for more details.
 
    You should have received a copy of the GNU Library General Public License
    along with this library; see the file COPYING.LGPL.  If not, write to
    the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
    Boston, MA 02110-1301, USA.
 
    Alternatively, this file is available under the Mozilla Public License
    Version 1.1.  You may obtain a copy of the License at
    http://www.mozilla.org/MPL/
 */
 
 #ifndef SELECTEVENTPOLLER_H
 #define SELECTEVENTPOLLER_H
 
 #include "ieventpoller.h"
 
 #include <unordered_map>
 
 #define WIN32_LEAN_AND_MEAN
 #include <windows.h>
 #ifdef FD_SETSIZE
 #error We must be able to set FD_SETSIZE - make sure that nothing else sets it!
 #endif
 #define FD_SETSIZE 1024
 #include <winsock2.h>
 
 // Windows select() diverges from "proper Unix" select() just enough to seriously hurt readability
 // when handling the differences with ifdefs, so use a separate implementation.
 // Besides, the fd_set from winsock2.h is actually an array of sockets (not a bitmap like on Unix), which
 // can be exploited to achive poll()-like performance characteristics without dealing with the problems
 // that WSAPoll() has. That is currently not implemented.
 
 class SelectEventPoller : public IEventPoller
 {
 public:
     SelectEventPoller(EventDispatcher *dispatcher);
     ~SelectEventPoller();
     IEventPoller::InterruptAction poll(int timeout) override;
     void interrupt(IEventPoller::InterruptAction) override;
 
     // reimplemented from IEventPoller
     void addFileDescriptor(FileDescriptor fd, uint32 ioRw) override;
     void removeFileDescriptor(FileDescriptor fd) override;
     void setReadWriteInterest(FileDescriptor fd, uint32 ioRw) override;
 
 private:
     void notifyRead(int fd);
     void resetFdSets();
 
     std::unordered_map<FileDescriptor, uint32 /*ioRw*/> m_fds;
 
     fd_set m_readSet;
     fd_set m_writeSet;
 
     FileDescriptor m_interruptSocket[2];
 };
 
 #endif // SELECTEVENTPOLLER_H